Temperature dependence in tensile properties and deformation behavior of GH4169 alloy
作者机构：School of Materials Science and EngineeringJiangsu UniversityZhenjiang212013JiangsuChina Yangtze Delta Region Institute of Advanced MaterialsSuzhou215100JiangsuChina State Key Laboratory of Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing100083China
出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)
年 卷 期：2023年第30卷第12期
页 面：2566-2581页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：supported in part by the State Key Lab of Advanced Metals and Materials in University of Science and Technology Beijing(No.2022-Z21) China Postdoctoral Science Foundation(No.2019M661738),Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.SJCX22_1860) Natural Science Foundation of Jiangsu Province(No.BK20220548)
主 题：GH4169 alloy Tensile property Deformation mechanism Serrated flow
摘 要：The effect of temperature on the tensile properties and deformation mechanism of GH4169 alloy has been systematically studied over a wide range of room temperature(RT)to 1000℃.The results indicate that the stress–strain curve of the alloy shows serrations at 200–600℃,and the character of the serrations changes from type A to type B and then to type C at different *** ultimate tensile strength of the alloy decreases gradually from RT to 600℃.The yield strength decreases slowly from RT to 700℃ but decreases rapidly above 800℃.Transmission electron microscopy analysis relieves that the primary deformation mechanism of the alloy below 500℃ is Orowan bypass *** temperatures between 600 and 700℃,the coordinated deformation of twins and cross-slip of dislocations are *** transformation of\upgamma^{\prime\prime}phase toδphase above 650℃ will decrease the *** primary deformation mechanism above 800℃ transforms into the repeated shearing of\upgamma^{\prime\prime}by dislocations to form multiple stacking *** grains were observed above 800℃,and continuous dynamic recrystallization and discontinuous dynamic recrystallization were *** stress concentration caused by Nb-rich carbides is the cause of intracrystalline crack *** 700℃,grain boundary crack sprouting is caused by the combined effect of slip band impact on grain boundaries and grain boundary dislocation *** relationship between the serrated flow behavior and the deformation mechanism has been discussed based on the experimental results.
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