摘要
针对GH4169高温合金,开展了高温单调拉伸以及高温低周疲劳试验,研究了其力学响应行为。结果表明,在较低应变幅(0.6%)下,合金并未出现明显软化特征,反而在循环后期出现了较小硬化现象,在较高应变幅(0.8%、1.0%和1.2%)下,呈现出较明显的硬化特征。Manson-Confin曲线拟合分析结果显示,合金的总应变幅由塑性应变决定,不符合Manson-Confin的双线性特点。Romberg-Osgood模型拟合结果表明,循环加载下材料硬化能力显著高于单调拉伸。Masing特性研究结果显示,随着应变幅的增大,合金的Non-Masing特征愈加明显。最后,基于试验数据,拟合了Chaboche混合硬化模型参数,并通过Abaqus有限元仿真验证了其准确性。研究结果为GH4169高温合金的复杂工况仿真提供了可靠的本构模型参数依据。
For superalloy GH4169,high-temperature monotonic tensile and high-temperature low-cycle fatigue tests were conducted,and its mechanical response behavior was studied.The results show that at a low strain amplitude of 0.6%,the alloy does not show obvious softening characteristics,but instead shows a small hardening phenomenon in the later stage of the cycle.At higher strain amplitudes(0.8%,1.0%and 1.2%),it shows a more obvious hardening characteristic.Manson-Coffin curve fitting analysis results indicates that the total strain amplitude of alloy is determined by the plastic strain,which does not conform to the bilinear characteristics of Manson-Coffin.The Romberg-Osgood model fitting results show that the hardening ability of the material under cyclic loading is significantly higher than that under monotonic tensile.The results of Masing characteristics study show that with the increasing of the strain amplitude,the Non-Masing characteristics of the alloy become more obvious.Finally,based on the test data,the Chaboche mixed hardening model pa-rameters are fitted,and the accuracy is verified by Abaqus finite element simulation.Thus,the research results provide a reliable consti-tutive model parameters basis for complex working condition simulation of superalloy GH4169.
作者
方舟
吴英弘
王维民
Fang Zhou;Wu Yinghong;Wang Weimin(School of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《锻压技术》
北大核心
2025年第6期204-213,共10页
Forging & Stamping Technology
基金
国家自然科学基金重点项目(92160203)
国家重点研发计划项目(2020YFB2010803)
中央高校人才基金(buctrc202026)。
