Effects of heat treatment on γ′ precipitates and tensile properties of a Ni-base superalloy

被引：38

作者：

Gai, Yongchao ^{[1
,2
]}

Zhang, Rui ^{[1
]}

Yang, Jinxia ^{[1
]}

Cui, Chuanyong ^{[1
]}

Qu, Jinglong ^{[3
]}

机构：

[1] Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China

[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China

[3] Cent Iron & Steel Res Inst, High Temp Mat Div, Beijing 100081, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2022年 / 842卷

基金：

国家重点研发计划;

关键词：

Ni-base superalloy; Solution treatment; gamma ' precipitates; Tensile properties; NICKEL-BASED SUPERALLOY; MECHANICAL-PROPERTIES; DISSOLUTION BEHAVIOR; MICROSTRUCTURE; KINETICS; CREEP; GROWTH; PHASE; STRENGTH;

D O I：

10.1016/j.msea.2022.143079

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Different heat treatments (solution temperatures: from 1100 degrees C to 1140 degrees C) were performed to optimize the microstructures improving the mechanical properties of a wrought superalloy GH4151. The solution treatments essentially affected the area fraction of gamma' precipitates and the grain size of. matrix. The dissolution kinetics model of primary gamma' precipitates was calculated. The results showed that the fine primary gamma' precipitates inside of grains dissolved first when the solution temperature below 1120 degrees C, while the coarse primary gamma' precipitates dissolved obviously as solution temperature above 1130 degrees C. Moreover, the grain growth occurred when the solution temperature exceeded 1130 degrees C. Besides, a higher area fraction of secondary gamma' precipitates with nearly spherical morphology were precipitated from the matrix during the subsequent aging process. The size of secondary gamma' precipitates increased with the increase of solution temperature. Then tensile tests were carried out at room temperature (RT) and 750 degrees C, the results showed that the alloy suffered solution treated at 1130 degrees C possessed the optimum tensile properties at 750 degrees C on account of the high area fraction of medium-sized secondary gamma' precipitates. However, the strength of alloy solution treated at 1140 degrees C decreased mainly because of the larger secondary gamma' precipitates. Meanwhile, the fracture mechanism changed from the ductile fracture to a mixed ductile and brittle fracture with the solution temperature rising.

引用

页数：11

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