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基于DEFORM的轴类大锻件锻造数值模拟与工艺研究
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作者 杨建奇 景财年 +7 位作者 林涛 杨后雷 涂英明 常福华 朱伟华 杨轩 张浩东 王心茹 《中国铸造装备与技术》 2026年第1期23-27,共5页
基于企业在大型轴类锻件锻造方面的实际工艺流程与生产需求,应用DEFORM软件开展数值模拟研究,旨在对传统镦粗-拔长工艺进行优化。通过分析坯料温度、模具下压速度及摩擦系数三个关键因素,设计正交试验并进行极差分析,确定了最优锻造工... 基于企业在大型轴类锻件锻造方面的实际工艺流程与生产需求,应用DEFORM软件开展数值模拟研究,旨在对传统镦粗-拔长工艺进行优化。通过分析坯料温度、模具下压速度及摩擦系数三个关键因素,设计正交试验并进行极差分析,确定了最优锻造工艺参数。基于所得参数开展全过程模拟,系统研究了工件内部的应力与应变分布规律。本数值模拟研究结果对大型轴类锻件的实际生产具有重要参考价值。 展开更多
关键词 大锻件 deform 数值模拟 工艺优化
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基于DEFORM仿真的F316L锻件缺肉分析与研究
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作者 李泽鹏 陈宏声 +1 位作者 梁素芳 米红娟 《锻造与冲压》 2026年第1期71-74,共4页
不锈钢阀门因其优异的耐腐蚀性、高温强度及良好的加工性能,被广泛应用于石油化工、核电、船舶及电力等关键领域。其核心承压部件(如阀体、阀盖)多采用锻造工艺制造,以获得致密组织和良好力学性能。然而,锻造过程复杂,受多重因素耦合影... 不锈钢阀门因其优异的耐腐蚀性、高温强度及良好的加工性能,被广泛应用于石油化工、核电、船舶及电力等关键领域。其核心承压部件(如阀体、阀盖)多采用锻造工艺制造,以获得致密组织和良好力学性能。然而,锻造过程复杂,受多重因素耦合影响,易产生如折叠、裂纹、缺肉等内部或表面缺陷。其中“缺肉”指锻件局部未能充满模具型腔,导致几何尺寸不足、轮廓不完整的现象。该缺陷不仅影响装配精度,更在服役中成为应力集中源,诱发早期失效。尤其在苛刻工况下,缺肉区域易成为腐蚀起始点或疲劳裂纹萌生地,严重威胁系统安全。 展开更多
关键词 缺肉 折叠 锻造工艺 不锈钢阀门 deform仿真
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Tensile failure mode transitions from subzero to elevated deformation temperature in Mg-6Al-1Zn alloy
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作者 Hafiz Muhammad Rehan Tariq Umer Masood Chaudry +3 位作者 Jeong-Rim Lee Nooruddin Ansari Mansoor Ali Tea-Sung Jun 《International Journal of Minerals,Metallurgy and Materials》 2026年第1期242-251,共10页
Understanding the temperature dependent deformation behavior of Mg alloys is crucial for their expanding use in the aerospace sector.This study investigates the deformation mechanisms of hot-rolled AZ61 Mg alloy under... Understanding the temperature dependent deformation behavior of Mg alloys is crucial for their expanding use in the aerospace sector.This study investigates the deformation mechanisms of hot-rolled AZ61 Mg alloy under uniaxial tension along rolling direction(RD)and transverse direction(TD)at-50,25,50,and 150℃.Results reveal a transition from high strength with limited elongation at-50℃ to significant softening and maximum ductility at 150℃.TD samples consistently showed 2%-6%higher strength than RD;however,this yield anisotropy diminished at 150℃ due to the shift from twinning to thermally activated slip and recovery.Fractography indicated a change from semi-brittle to fully ductile fracture with increasing temperature.Electron backscattered diffraction(EBSD)analysis confirmed twinning-driven grain refinement at low temperatures,while deformation at high temperatures involved grain elongation along shear zones,enabling greater strain accommodation before material failure. 展开更多
关键词 Mg alloy deformation temperature twinning dynamics grain refinement dynamic recovery fracture mechanics
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Ultrafast Laser Shock Straining in Chiral Chain 2D Materials:Mold Topology‑Controlled Anisotropic Deformation
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作者 Xingtao Liu Danilo de Camargo Branco +5 位作者 Licong An Mingyi Wang Haoqing Jiang Ruoxing Wang Wenzhuo Wu Gary J.Cheng 《Nano-Micro Letters》 2026年第3期274-289,共16页
Tellurene,a chiral chain semiconductor with a narrow bandgap and exceptional strain sensitivity,emerges as a pivotal material for tailoring electronic and optoelectronic properties via strain engineering.This study el... Tellurene,a chiral chain semiconductor with a narrow bandgap and exceptional strain sensitivity,emerges as a pivotal material for tailoring electronic and optoelectronic properties via strain engineering.This study elucidates the fundamental mechanisms of ultrafast laser shock imprinting(LSI)in two-dimensional tellurium(Te),establishing a direct relationship between strain field orientation,mold topology,and anisotropic structural evolution.This is the first demonstration of ultrafast LSI on chiral chain Te unveiling orientation-sensitive dislocation networks.By applying controlled strain fields parallel or transverse to Te’s helical chains,we uncover two distinct deformation regimes.Strain aligned parallel to the chain’s direction induces gliding and rotation governed by weak interchain interactions,preserving covalent intrachain bonds and vibrational modes.In contrast,transverse strain drives shear-mediated multimodal deformations—tensile stretching,compression,and bending—resulting in significant lattice distortions and electronic property modulation.We discovered the critical role of mold topology on deformation:sharp-edged gratings generate localized shear forces surpassing those from homogeneous strain fields via smooth CD molds,triggering dislocation tangle formation,lattice reorientation,and inhomogeneous plastic deformation.Asymmetrical strain configurations enable localized structural transformations while retaining single-crystal integrity in adjacent regions—a balance essential for functional device integration.These insights position LSI as a precision tool for nanoscale strain engineering,capable of sculpting 2D material morphologies without compromising crystallinity.By bridging ultrafast mechanics with chiral chain material science,this work advances the design of strain-tunable devices for next-generation electronics and optoelectronics,while establishing a universal framework for manipulating anisotropic 2D systems under extreme strain rates.This work discovered crystallographic orientation-dependent deformation mechanisms in 2D Te,linking parallel strain to chain gliding and transverse strain to shear-driven multimodal distortion.It demonstrates mold geometry as a critical lever for strain localization and dislocation dynamics,with sharp-edged gratings enabling unprecedented control over lattice reorientation.Crucially,the identification of strain field conditions that reconcile severe plastic deformation with single-crystal retention offers a pathway to functional nanostructure fabrication,redefining LSI’s potential in ultrafast strain engineering of chiral chain materials. 展开更多
关键词 Tellurene Laser shock imprinting Strain engineering Anisotropic deformation Chiral chain semiconductor Dislocation dynamics
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Numerical Simulation of the Welding Deformation of Marine Thin Plates Based on a Temperature Gradient-thermal Strain Method
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作者 Lin Wang Yugang Miao +3 位作者 Zhenjian Zhuo Chunxiang Lin Benshun Zhang Duanfeng Han 《哈尔滨工程大学学报(英文版)》 2026年第1期122-135,共14页
Marine thin plates are susceptible to welding deformation owing to their low structural stiffness.Therefore,the efficient and accurate prediction of welding deformation is essential for improving welding quality.The t... Marine thin plates are susceptible to welding deformation owing to their low structural stiffness.Therefore,the efficient and accurate prediction of welding deformation is essential for improving welding quality.The traditional thermal elastic-plastic finite element method(TEP-FEM)can accurately predict welding deformation.However,its efficiency is low because of the complex nonlinear transient computation,making it difficult to meet the needs of rapid engineering evaluation.To address this challenge,this study proposes an efficient prediction method for welding deformation in marine thin plate butt welds.This method is based on the coupled temperature gradient-thermal strain method(TG-TSM)that integrates inherent strain theory with a shell element finite element model.The proposed method first extracts the distribution pattern and characteristic value of welding-induced inherent strain through TEP-FEM analysis.This strain is then converted into the equivalent thermal load applied to the shell element model for rapid computation.The proposed method-particularly,the gradual temperature gradient-thermal strain method(GTG-TSM)-achieved improved computational efficiency and consistent precision.Furthermore,the proposed method required much less computation time than the traditional TEP-FEM.Thus,this study lays the foundation for future prediction of welding deformation in more complex marine thin plates. 展开更多
关键词 Marine thin plate Welding deformation Numerical simulation Temperature gradient-thermal strain method Shell element
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Observation of dislocation-mediated plastic deformation in TiMoN coating
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作者 Sheng-Hao Zhou Zhao-Guo Qiu +2 位作者 Zhen-Yu Wang Wei Yang Ai-Ying Wang 《Rare Metals》 2025年第4期2845-2852,共8页
The recently established theory has built clear connections between hardness and toughness and electron structure involving both valence electron concentration(VEC)and core electron count(CEC)in transition metal nitri... The recently established theory has built clear connections between hardness and toughness and electron structure involving both valence electron concentration(VEC)and core electron count(CEC)in transition metal nitride(TMN)ceramics.However,the underlying deformation mechanisms remain unclear.Herein,we conduct in-depth analysis on microstructure evolution during deformation of the high VEC-CEC solution TiMoN coatings having desired combination of high hardness and toughness.The effects of solid solution,preferred orientation linked with symbiotic compressive stress,grain size and dislocations are systematically discussed.We discover that numerous dislocations have been implanted into the nanocrystals of the TiMoN coating during the high-ionization arc deposition.Using two-beam bright-field imaging,we count the dislocation density and confirm occurrence of dislocation multiplication to form effective plastic deformation,which contributes to significant strain hardening,comparable to solid solution hardening,fine-grain hardening and compressive stress hardening.The improved dislocation activities also play a crucial role in enhancing the toughness by providing extra energy dissipation paths.This work gains new insights into the origins of mechanical properties of ceramic coatings and possibility to tune them via defects. 展开更多
关键词 timon coatings HARDNESS microstructure evolution deformation electron structure solid solutionprefe dislocation mediated plastic deformation deformation mechanisms valence electron
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Hot deformation and hot processing behavior of deformable Ti_(p)reinforced Mg-5Zn-0.5Ca composite
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作者 Yu Zhang Kun-kun Deng +3 位作者 Cui-ju Wang Kai-bo Nie Quan-xin Shi Yi-jia Li 《Journal of Materials Science & Technology》 2025年第26期159-172,共14页
The spherical Ti particle(Ti_(p))reinforced Mg-5Zn-0.5Ca(Ti_(p)/ZX50)composite was prepared via the semisolid stirring casting process and the effects of Ti_(p)on the hot deformation and hot processing behavior of mat... The spherical Ti particle(Ti_(p))reinforced Mg-5Zn-0.5Ca(Ti_(p)/ZX50)composite was prepared via the semisolid stirring casting process and the effects of Ti_(p)on the hot deformation and hot processing behavior of matrix alloy were investigated through uniaxial hot compression testing.The results indicate that a particle deformation zone(PDZ)forms around the Ti_(p)with the deformation of the Ti_(p)/ZX50 composite,which is propitious to the dynamic recrystallization(DRX)of the matrix alloy.The range of the PDZ and the promoting effect of the Ti_(p)on DRXed nucleation are inversely related to the deformation degree of the Ti_(p).Moreover,the deformation of Ti_(p)alleviates the high stress in the matrix alloy during deformation,expanding the processing range and reducing the average deformation activation energy of the matrix alloy.Notably,the minimum processing temperature(493 K)of the Ti_(p)/ZX50 composite is significantly lower than that of hardened particle reinforced magnesium matrix composites.The hot deformation mechanism of the Ti_(p)/ZX50 composite is dislocation climb controlled by both lattice diffusion and pipe diffusion. 展开更多
关键词 deformable Ti_(p) Particle deformation zone Dynamic recrystallization Hot deformation mechanism Processing map
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Achieving ultrahigh strength and ductility via high-density nanoprecipitates triggering multiple deformation mechanisms in a dual-aging high-entropy alloy with precold deformation 被引量:1
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作者 Liyuan Liu Yang Zhang Zhongwu Zhang 《Journal of Materials Science & Technology》 2025年第2期27-41,共15页
How to achieve high-entropy alloys(HEAs)with ultrahigh strength and ductility is a challenging issue.Precipitation strengthening is one of the methods to significantly enhance strength,but unfortunately,ductility will... How to achieve high-entropy alloys(HEAs)with ultrahigh strength and ductility is a challenging issue.Precipitation strengthening is one of the methods to significantly enhance strength,but unfortunately,ductility will be lost.To overcome the strength-ductility trade-off,the strategy of this study is to induce the formation of high-density nanoprecipitates through dual aging(DA),triggering multiple deformation mechanisms,to obtain HEAs with ultrahigh strength and ductility.First,the effect of precold deformation on precipitation behavior was studied using Ni_(35)(CoFe)_(55)V_(5)Nb_(5)(at.%)HEAas the object.The results reveal that the activation energy of recrystallization is 112.2 kJ/mol.As the precold-deformation amount increases from 15%to 65%,the activation energy of precipitation gradually decreases from 178.8 to 159.7 kJ/mol.The precipitation time shortens,the size of the nanoprecipitate decreases,and the density increases.Subsequently,the thermal treatment parameters were optimized,and the DA process was customized based on the effect of precold deformation on precipitation behavior.High-density L1_(2) nanoprecipitates(~3.21×10^(25) m^(-3))were induced in the 65% precold-deformed HEA,which led to the simultaneous formation of twins and stacking fault(SF)networks during deformation.The yield strength(YS),ultimate tensile strength,and ductility of the DA-HEA are~2.0 GPa,~2.2 GPa,and~12.3%,respectively.Compared with the solid solution HEA,the YS of the DA-HEA increased by 1,657 MPa,possessing an astonishing increase of~440%.The high YS stems from the precipitation strengthening contributed by the L1_(2) nanoprecipitates and the dislocation strengthening contributed by precold deformation.The synergistically enhanced ductility stems from the high strain-hardening ability under the dual support of twinning-induced plasticity and SF-induced plasticity. 展开更多
关键词 High-entropy alloy Precold deformation Precipitation behavior Ultrahigh strength deformation mechanism
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Large deformation problems arising from deep excavation in silt strata:A case study in Shenzhen,China
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作者 Xuefeng Ou Wei Liao +2 位作者 Xiangcou Zheng Guofu Yang Ashraf S.Osman 《Journal of Rock Mechanics and Geotechnical Engineering》 2025年第4期2576-2589,共14页
Deep excavations in silt strata can lead to large deformation problems,posing risks to both the excavation and adjacent structures.This study combines field monitoring with numerical simulation to investigate the unde... Deep excavations in silt strata can lead to large deformation problems,posing risks to both the excavation and adjacent structures.This study combines field monitoring with numerical simulation to investigate the underlying mechanisms and key aspects associated with large deformation problems induced by deep excavation in silt strata in Shenzhen,China.The monitoring results reveal that,due to the weak property and creep effect of the silt strata,the maximum wall deflection in the first excavated section(Section 1)exceeds its controlled value at more than 93%of measurement points,reaching a peak value of 137.46 mm.Notably,the deformation exhibits prolonged development characteristics,with the diaphragm wall deflections contributing to 39%of the overall deformation magnitude during the construction of the base slab.Subsequently,numerical simulations are carried out to analyze and assess the primary factors influencing excavation-induced deformations,following the observation of large deformations.The simulations indicate that the low strength of the silt soil is a pivotal factor that results in significant deformations.Furthermore,the flexural stiffness of the diaphragm walls exerts a notable influence on the development of deformations.To address these concerns,an optimization study of potential treatment measures was performed during the subsequent excavation of Section 2.The combined treatment approach,which comprises the reinforcement of the silt layer within the excavation and the increase in the thickness of the diaphragm walls,has been demonstrated to offer an economically superior solution for the handling of thick silt strata.This approach has the effect of reducing the lateral wall displacement by 83.1%and the ground settlement by 70.8%,thereby ensuring the safe construction of the deep excavation. 展开更多
关键词 Silt strata Deep excavation Large deformation deformation mechanism Treatment measures
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Progress in Bionic Deformable Wing of Aircraft Driven by Shape Memory Alloy
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作者 Xiaomin Jia Tong Chang +3 位作者 Shihui Zhou Xiaolong Zhang Shupeng Wang Zhihui Zhang 《Journal of Bionic Engineering》 2025年第5期2236-2260,共25页
Birds have developed near-perfect structures and functionality over millions of years of natural evolution.To improve the efficiency of fixed-wing vehicles in different environments,researchers have developed deformab... Birds have developed near-perfect structures and functionality over millions of years of natural evolution.To improve the efficiency of fixed-wing vehicles in different environments,researchers have developed deformable wings inspired by the wing structures of birds.Shape Memory Alloy(SMA)is applied as a smart material to the deformable wing.Compared with other drive methods,SMA actuators have the advantages of high drive capacity and a simple structure for driving wing deformation.According to the shape memory effect,SMA actuators are classified as single-range and dual-range actuators.The wing structure designed for each SMA drive is unique.By comparing and analyzing the structures of airfoils,airfoils with similar drive forms and deformation structures are put together for review and discussion.The deformable wings are categorized into out-of-face deformation,in-face deformation,airfoil curvature deformation,and combined deformation with multiple degrees of freedom based on the structure and location of the wing that produces the deformation.An overview of the deformed wing is introduced by telling the bionic theory of seagulls.The principles of deformation of the wing,the mechanics of the SMA actuator mechanism,and the aerodynamic characteristics of the deformable wing are presented.The structure and working principle of SMA actuators for each type of deformable wing are explained in detail.Methods and approaches to study the deformability of deformable wings are analyzed and summarized.This work provides comprehensive insights and perspectives for future studies of SMA-driven deformable airfoils. 展开更多
关键词 deformable wing Shape memory alloy deformation structure Smart material
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A non-affine constitutive model for the extremely large deformation of hydrogel polymer network based on network modeling method
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作者 Jincheng Lei Yuan Gao +1 位作者 Danyang Wang Zishun Liu 《Acta Mechanica Sinica》 2025年第7期69-80,共12页
Current hyperelastic constitutive models of hydrogels face difficulties in capturing the stress-strain behaviors of hydrogels under extremely large deformation because the effect of non-affine deformation of the polym... Current hyperelastic constitutive models of hydrogels face difficulties in capturing the stress-strain behaviors of hydrogels under extremely large deformation because the effect of non-affine deformation of the polymer network inside is ambiguous.In this work,we construct periodic random network(PRN)models for the effective polymer network in hydrogels and investigate the non-affine deformation of polymer chains intrinsically originates from the structural randomness from bottom up.The non-affine deformation in PRN models is manifested as the actual stretch of polymer chains randomly deviated from the chain stretch predicted by affine assumption,and quantified by a non-affine ratio of each polymer chain.It is found that the non-affine ratios of polymer chains are closely related to bulk deformation state,chain orientation,and initial chain elongation.By fitting the non-affine ratio of polymer chains in all PRN models,we propose a non-affine constitutive model for the hydrogel polymer network based on micro-sphere model.The stress-strain curves of the proposed constitutive models under uniaxial tension condition agree with the simulation results of different PRN models of hydrogels very well. 展开更多
关键词 Non-affine deformation Periodic random network model Large deformation Constitutive model
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Contact between deformed rough surfaces
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作者 Liao-Liang Ke 《Acta Mechanica Sinica》 2025年第2期148-149,共2页
Almost all solid surfaces are rough.The randomness and complexity of roughness make the behavior of contact deformation,electrical conductivity,and heat transfer between solids elusive.If the solids are subjected to f... Almost all solid surfaces are rough.The randomness and complexity of roughness make the behavior of contact deformation,electrical conductivity,and heat transfer between solids elusive.If the solids are subjected to further tensile,bending,or torsional deformation,will more complex or new contact phenomena occur?Clarifying this issue is of great significance to developing and designing some major equipment serving in extreme environments. 展开更多
关键词 Contact deformation Multi-field coupling behavior Interfacial effects in extreme environments Tensile/bending/torsional deformation
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The post-deformation softening and hardening mechanisms of a Mg-2Y-1Zn alloy during double-stage hot compression
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作者 Hang Xu Yang Mo +4 位作者 Fulin Jiang Luoyi Wu Jie Tang Jie Teng Hui Zhang 《Journal of Magnesium and Alloys》 2025年第9期4530-4543,共14页
Multi-pass hot processing methods are commonly used in magnesium(Mg)alloys to overcome the poor workability due to limited slip systems,which generally involve complicated post-deformation softening and hardening beha... Multi-pass hot processing methods are commonly used in magnesium(Mg)alloys to overcome the poor workability due to limited slip systems,which generally involve complicated post-deformation softening and hardening behaviors.In this work,to reveal post-deformation softening and hardening mechanisms of a Mg-2Y-1Zn alloy,double-stage hot compression tests and microstructural observations were conducted.The results showed that the softening fraction of Mg-2Y-1Zn alloy showed a non-linear dependence on deformation conditions and could be general coupled by Z parameter.Due to the formation and cross-overlapping of twins and kinks,only static recovery(SRV)occurred during holding process at 300℃/0.001 s^(-1) which led to the least static softening:5.52% after 10 s of holding.For samples at 400℃/0.001s^(-1),the enhanced post-deformation softening,which is 11.93% after 10 s of holding,was attributed to static recrystallization(SRX)followed continuous dynamic recrystallization(CDRX)happened during first deformation stage as well as SRV influenced by the LPSO phases.Under deformation condition of 400℃/0.1 s^(-1),the coupled meta-dynamic recrystallization(MDRX)and SRX resulted in serious stress relaxation,which is 42.83% after 10 s of holding,and caused hardening phenomenon at reloading stage.The 18R-LPSO and 14H-LPSO phases synchronously worked on deformation behaviors and limited the growth of recrystallized grains.Further,a simplified static softening kinetics model was established based on Johnson-Mehl-Avrami-Kolmogorov equation and employed to rationalize experimental data. 展开更多
关键词 Mg-2y-1zn alloy LPSO phase Hot deformation Static softening Post-deformation hardening
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Probing local difference of martensite formation: a study on localized deformation modes in drawn 304H stainless steel wires
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作者 Zhi-xian Peng Rong-zhe Hu +3 位作者 Jing Liu Ke Peng Zhen Wang Zheng-liang Xue 《Journal of Iron and Steel Research International》 2025年第4期991-1002,共12页
304H austenitic stainless steel wire was investigated,emphasizing microstructural deformation,martensite phase transformation,and residual magnetic properties during drawing.Utilizing several microstructural observati... 304H austenitic stainless steel wire was investigated,emphasizing microstructural deformation,martensite phase transformation,and residual magnetic properties during drawing.Utilizing several microstructural observation techniques,the volume fraction of martensite,modes of grain deformation in distinct regions,and the phase relationship between austenite and martensite were comprehensively characterized.In addition,a finite element simulation with representative volume elements specific to different zones also offers insights into strain responses during the drawing process.Results from the first-pass drawing reveal that there exists a higher volume fraction of martensite in the central region of 304H austenitic stainless steel wire compared to edge areas.This discrepancy is attributed to a concentrated presence of shear slip system{111}<110>γcrystallographic orientation,primarily accumulating in the central region obeying the Kurdjumov-Sachs path.Subsequent to the second drawing pass,the cumulative shear deformation within distinct regions of the steel wire became more pronounced.This resulted in a progressive augmentation of the volume fraction of martensite in both the central and peripheral regions of the steel wire.Concurrently,this led to a discernible elevation in the overall residual magnetism of the steel wire. 展开更多
关键词 304H stainless steel wire deformation-induced martensite transformation Localized deformation Representative volume element Cold drawing
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Enhancement of damage tolerance in Ti-6554 alloy through twinning and hetero-deformation induced strengthening synergy
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作者 FU Ming-zhu LUO Wei +7 位作者 LI Si-yun YAO Wen-xi PENG Shu-xian LIU Yi-kui LIU Ji-xiong ZHANG Ping-hui LIU Hui-qun PAN Su-ping 《Journal of Central South University》 2025年第3期744-759,共16页
Heterogeneous structure exhibits superiority in improving mechanical properties,whereas their effects on fatigue damage properties have rarely been studied.In this work,we employed a high-throughput gradient heat trea... Heterogeneous structure exhibits superiority in improving mechanical properties,whereas their effects on fatigue damage properties have rarely been studied.In this work,we employed a high-throughput gradient heat treatment method(757−857℃)to rapidly acquire the solution microstructure of the Ti-6554 alloy with different recrystallization degrees(0%,40%and 100%),followed by the same aging treatment.The results showed that theβ-hetero structure exhibited a yield strength(σ_(YS))of 1403 MPa,an increase of 6.7%,and a remarkable improvement in uniform elongation(UE)of 109.7%,reaching 6.5%,compared to the homogeneous structure.Interestingly,introducing a heterogeneous structure not only overcame the traditional trade-off between strength and ductility but also enhanced fatigue crack propagation(FCP)performance.During FCP process,β-hetero structure,through hetero-deformation induced(HDI)strengthening effects,promoted the accumulation of geometric necessary dislocations(GNDs)within coarseα_(S) phase,enabling faster attainment of the critical shear stress of twinning and increasing twinning density.This facilitated stress relief,improved plastic deformation in the crack tip zone,and increased the critical fast fracture threshold from 30.4 to 36.0 MPa·m^(1/2)showing an enlarged steady state propagation region.This study provides valuable insights on tailoring fatigue damage tolerance through heterogeneous structure for titanium alloys. 展开更多
关键词 Ti-6554 alloy fatigue crack propagation hetero-deformation induced(HDI)strengthening deformation induced nano-scale twins
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基于DEFORM的风电轴承保持架窗口冲裁过程仿真研究
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作者 刘晟杰 万光虎 +5 位作者 聂延艳 王黎明 王燕霜 杜雨 李剑峰 李方义 《机械设计与研究》 北大核心 2025年第3期272-278,共7页
主轴轴承保持架是风力发电机的关键组件,冲裁是保持架制造的基本工艺。多种冲裁参数对保持架的断面质量起到决定性作用,但目前缺乏对其冲裁过程的有限元仿真,无法系统优化冲裁参数。鉴于此,以DEFORM有限元软件为基础,揭示了冲裁中工艺... 主轴轴承保持架是风力发电机的关键组件,冲裁是保持架制造的基本工艺。多种冲裁参数对保持架的断面质量起到决定性作用,但目前缺乏对其冲裁过程的有限元仿真,无法系统优化冲裁参数。鉴于此,以DEFORM有限元软件为基础,揭示了冲裁中工艺参数和断面质量的复杂关联,基于响应曲面法实现了冲裁参数的优化。首先,利用DEFORM软件,系统分析冲裁速度、冲裁间隙和凸模刃口圆角半径对保持架窗口断面质量的综合影响,三者的最佳组合能有效提升产品的表面质量。然后,通过响应曲面法,实现工艺参数间的协同影响分析,明晰了冲裁工艺参数间的相互作用及其对断面质量的综合效应。基于软件仿真结果确定了保持架窗口冲裁最佳工艺参数组合:冲裁间隙设定为材料厚度的9.31%,冲裁速度调整至103.26 mm/s,凸模刃口圆角半径优化为厚度的1.77%。仿真结果为风电轴承保持架窗口冲裁工艺的优化提供了重要参考,能够大幅提高产品的质量和生产效率。 展开更多
关键词 轴承保持架 deform 响应曲面法 有限元仿真
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基于DEFORM数值模拟的15Cr14Co12Mo5Ni钢齿轮锻造方案优化 被引量:1
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作者 施文鹏 黎恒逸 +2 位作者 张元东 舒勇 王同超 《精密成形工程》 北大核心 2025年第4期78-86,共9页
目的解决15Cr14Co12Mo5Ni钢齿轮锻件易出现粗晶和晶粒度不均匀的问题。方法采用DEFORM数值模拟软件分析15Cr14Co12Mo5Ni钢齿轮成形过程,基于分析结果优化锻件设计方案和锻造工艺方案。结果优化了锻件小端头厚度、中心凹坑尺寸及锻造工... 目的解决15Cr14Co12Mo5Ni钢齿轮锻件易出现粗晶和晶粒度不均匀的问题。方法采用DEFORM数值模拟软件分析15Cr14Co12Mo5Ni钢齿轮成形过程,基于分析结果优化锻件设计方案和锻造工艺方案。结果优化了锻件小端头厚度、中心凹坑尺寸及锻造工艺方案中制坯镦粗高度,使模锻成形过程中齿轮锻件各部位的变形量更加均匀,保证了齿轮小端头难变形区域的变形量≥40%,达到了细化晶粒的目的。结论采用优化后的工艺进行零件试制,结果与DEFORM数值模拟结果相吻合。 展开更多
关键词 15Cr14Co12Mo5Ni钢 deform数值模拟 锻造方案 变形量 晶粒度
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基于Deform的弯链板U弯成形分析及模具参数优化
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作者 汪永明 孙永文 连润柱 《塑性工程学报》 北大核心 2025年第6期79-86,共8页
针对弯链板在U弯成形过程中产生的向外弯曲现象,基于Deform软件在其U弯凹模上分别建立了无预弯块和有预弯块的2组U弯成形有限元仿真模型,仿真结果表明:有预弯块的U弯凹模对工件的向外弯曲变形有着很大的改善作用。建立了5组不同预弯块... 针对弯链板在U弯成形过程中产生的向外弯曲现象,基于Deform软件在其U弯凹模上分别建立了无预弯块和有预弯块的2组U弯成形有限元仿真模型,仿真结果表明:有预弯块的U弯凹模对工件的向外弯曲变形有着很大的改善作用。建立了5组不同预弯块间距的U弯成形有限元仿真模型,分析不同预弯块间距对工件的台阶面间距和平行度的影响,根据仿真结果对比:当预弯块间距为75 mm时,U弯成形件的成形效果最佳,此时其台阶面间距为38.36 mm,台阶面向内弯曲夹角为0.1°。取预弯块间距为最佳值75 mm时,分别研究了不同的U弯间隙与凹模圆角半径对工件U弯成形效果的影响,得出其最佳U弯间隙为5.15 mm,最佳凹模圆角半径为10 mm。基于优化后的模具参数进行了U弯成形实验,依据实验结果,U弯成形件的窄端面间距为27.41~27.47 mm,台阶面间距为38.45~38.61 mm,台阶面夹角为-0.14°~0.27°,实验结果满足U弯成形的工艺要求,有效解决了弯链板在U弯成形过程中的向外弯曲现象。 展开更多
关键词 弯链板 U弯成形 deform仿真 模具改进 参数优化
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Interaction between dynamic recrystallization and phase transformation of Ti-43Al-4Nb-1Mo-0.2B alloy during hot deformation 被引量:2
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作者 Xiaofei Chen Bin Tang +5 位作者 Beibei Wei Wenxin Xu Biao Ma Jinhua Dai Guoming Zheng Jinshan Li 《Journal of Materials Science & Technology》 2025年第11期130-142,共13页
Theβsolidifiedγ-TiAl alloy holds important application value in the aerospace industry,while its com-plex phase compositions and geometric structures pose challenges to its microstructure control during the thermal-... Theβsolidifiedγ-TiAl alloy holds important application value in the aerospace industry,while its com-plex phase compositions and geometric structures pose challenges to its microstructure control during the thermal-mechanical process.The microstructure evolution of Ti-43Al-4Nb-1Mo-0.2B alloy at 1200℃/0.01 s−1 was investigated to clarify the coupling role of dynamic recrystallization(DRX)and phase transformation.The results revealed that the rate of DRX inα2+γlamellar colonies was comparatively slower than that inβo+γmixed structure,instead being accompanied by intense lamellar kinking and rotation.The initiation and development rates of DRX inα2,βo,andγphases decreased sequentially.The asynchronous DRX of the various geometric structures and phase compositions resulted in the un-even deformed microstructure,and the dynamic softening induced by lamellar kinking and rotation was replaced by strengthened DRX as strain increased.Additionally,the blockyα2 phase and the terminals ofα2 lamellae were the preferential DRX sites owing to the abundant activated slip systems.Theα2→βo transformation within lamellar colonies facilitated DRX and fragment ofα2 lamellae,while theα2→γtransformation promoted the decomposition ofα2 lamellae and DRX ofγlamellae.Moreover,the var-iedβo+γmixed structures underwent complicated evolution:(1)Theγ→βo transformation occurred at boundaries of lamellar colonies,followed by simultaneous DRX ofγlamellar terminals and neighboringβo phase;(2)DRX occurred earlier within the band-likeβo phase,with the delayed DRX in enclosedγphase;(3)DRX within theβo synapses and neighboringγphase was accelerated owing to generation of elastic stress field;(4)Dispersedβo particles triggered particle stimulated nucleation(PSN)ofγphase.Eventually,atomic diffusion along crystal defects inβo andγphases caused fracture of band-likeβo phase and formation of massiveβo particles,impeding grain boundary migration and hindering DRXed grain growth ofγphase. 展开更多
关键词 TiAl alloy Hot deformation Dynamic recrystallization Phase transformation
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基于Deform的25CrMo4车用钢制花键轴杆零件冷挤压成形工艺研究
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作者 季文骏 龚红英 +2 位作者 兰毅 马骥 廖泽寰 《上海工程技术大学学报》 2025年第2期181-186,共6页
对一种具有复杂外花键的车用轴杆零件挤压工艺展开系统研究,首先对零件进行特性分析,利用Deform软件选取挤压速度、摩擦因数和坯料锥角3个工艺参数进行正交模拟试验,使用极差法确定最优工艺参数为:凸模挤压速度20 mm/s,摩擦因数0.12,坯... 对一种具有复杂外花键的车用轴杆零件挤压工艺展开系统研究,首先对零件进行特性分析,利用Deform软件选取挤压速度、摩擦因数和坯料锥角3个工艺参数进行正交模拟试验,使用极差法确定最优工艺参数为:凸模挤压速度20 mm/s,摩擦因数0.12,坯料锥角15°,零件挤压成形获得最大载荷和最低损伤值,挤压载荷与优化前相比降低26.3%,损伤值则降低81.4%。 展开更多
关键词 花键轴杆零件 冷挤压 正交数值模拟试验 deform软件
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