摘要
采用EBSD、SEM和TEM研究了预应变处理(10%~50%)对新型镍基高温合金微观组织和高温(600℃)拉伸性能的影响。结果表明,预变形在合金中预制了大量的位错和层错亚结构,并且合金在600℃的强度随预变形量的增加呈单调增加趋势,而合金的延伸率随预变形量的增加呈现先降低后增加的趋势。同时,当预变形量为50%时,合金试样的屈服强度增加至1516 MPa,极限抗拉强度为1677 MPa,断后伸长率为2.47%。此外,强度的提升主要归因于位错与γ′相、层错以及不同(111)面上的层错相交形成的L-C锁交互作用,这为高性能镍基高温合金调控提供了一种新的强化方法。
The effects of pre-strain treatment(10%–50%)on microstructure and tensile properties of a novel Ni-based superalloy at high temperature(600℃)were studied by EBSD,SEM and TEM.The results show that a large number of dislocation and stratification substructures are prefabricated in the alloy,and the strength of the alloy at 600℃increases monotonically with the increase in the pre-deformation amount,while the elongation of the alloy decreases first and then increases.At the same time,when the pre-deformation amount is 50%,the yield strength of the alloy sample increases to 1516 MPa,the ultimate tensile strength is 1677 MPa,and the elongation after fracture is 2.47%.In addition,the strength improvement is mainly attributed to the L-C lock interaction formed by the intersection of the dislocation with theγ′phase,the stacking fault,and the lamination fault on different(111)planes,which provides a new strengthening method for the regulation of high performance Ni-based superalloys.
作者
单宣铭
高钰璧
王兴茂
丁雨田
Shan Xuanming;Gao Yubi;Wang Xingmao;Ding Yutian(State Key Laboratory of Advanced and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《稀有金属材料与工程》
北大核心
2025年第6期1527-1534,共8页
Rare Metal Materials and Engineering
基金
国家重点研发计划(2017YFA0700703)
2023年兰州理工大学红柳优秀青年人才支持计划。
关键词
新型镍基高温合金
预应变处理
微观组织
力学性能
强化机制
novel Ni-based superalloy
pre-strain treatment
microstructure
mechanical properties
reinforcement mechanism
