GH4169合金在冷轧和热处理过程中的组织演变和力学性能  

Microstructure Evolution and Mechanical Properties of GH4169 Alloy During Cold Rolling and Heat Treatment

作　　者：徐依 张兵[1,2] 杨艳 陈乐 赵田丽[1,2] 王奇[4] 张志娟 杨奔 昝斌[3] 蔡军 王快社 Xu Yi;Zhang Bing;Yang Yan;Chen Le;Zhao Tianli;Wang Qi;Zhang Zhijuan;Yang Ben;Zan Bin;Cai Jun;Wang Kuaishe(College of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;National and Local Joint Engineering Research Center for Functional Materials Processing,Xi'an University of Architecture and Technology,Xi'an 710055,China;State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization,Jinchang 737100,China;Jinchuan Group Nickel Alloy Co.,Ltd,Jinchang 737100,China)

机构地区：[1]西安建筑科技大学冶金工程学院 [2]西安建筑科技大学功能材料加工国家与地方联合工程研究中心 [3]中国镍钴资源综合利用国家重点实验室 [4]金川集团镍合金有限公司

出　　处：《稀有金属材料与工程》2023年第7期2385-2395,共11页Rare Metal Materials and Engineering

基　　金：Major Science and Technology Program of Gansu Province (20ZD7GC009);Scientific and Technological Innovation Team Project of Shaanxi Innovation Capability Support Plan,China (2022TD-30)。

摘　　要：采用扫描电子显微镜、电子背散射衍射和透射电子显微镜研究了GH4169合金在冷轧和热处理过程中的组织演变和力学特征。结果表明,随着冷轧变形的增加,晶粒被拉长成纤维状,微观组织中未观察到δ相。热处理后,原始变形晶粒被细小的再结晶晶粒取代,晶粒尺寸随着冷轧变形量的增加和热处理温度的降低而减小。但当变形量大于50%时,出现混合晶粒结构。热处理温度为950和990℃时,基体中存在δ相析出。随变形量的增加,δ相含量而增加,形态由短棒状变为球状。在冷轧状态下,当变形量为70%时,抗拉伸强度(UTS)达到1484.27 MPa,是冷轧态合金(772.5 MPa)的1.92倍,但延伸率(EL)降低到8.93%。然而经过990℃热处理后,延伸率提高到46.47%,是冷轧状态合金EL的5.2倍。冷轧变形量为50%、热处理温度为990℃时,获得了最佳的力学性能组合(UTS=943.59 MPa,EL=52.31%)。The microstructure evolution and mechanical properties of GH4169 alloy during cold rolling and heat treatment were investigated by scanning electron microscope,electron backscatter diffraction,and transmission electron microscope.Results show that the grains are elongated into fibers with increasing the cold rolling deformation degree,and no δ phase can be observed in the microstructure.After heat treatment,the original deformed grains are replaced by small recrystallized grains,and the grain size is decreased with increasing the cold rolling deformation degree and decreasing the heat temperature.However,the mixed grain structure appears after cold rolling deformation of 50%.When the heat treatment temperature is 950 and 990 ℃,the δ phase is precipitated in the matrix.The content of δ phase is increased with increasing the deformation degree and the morphology is changed from short rods into spherical shapes.When the deformation degree is 70%,the ultimate tensile strength(UTS) reaches 1484.27 MPa,which is 1.92 times higher than that of the cold rolled alloy(772.5 MPa).However,the elongation(EL) decreases to 8.93%,and it increases to 46.47% after heat treatment at 990 ℃,which is 5.2 times higher than that of the cold-rolled alloy.The optimal combination of mechanical properties(UTS=943.59 MPa,EL=52.31%) can be achieved when the cold rolling deformation degree is 50% and the heat treatment temperature is 990 ℃.

关 键 词：GH4169 冷轧 热处理 Δ相 力学性能 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG335.12[金属学及工艺—合金] TG156[金属学及工艺—金属学]