Creep behavior and damage feature of Re/Ru-containing single crystal nickel-based superalloy at high temperature

被引：0

作者：

Yan H.-J. ^{[1
,2
]}

Tian S.-G. ^{[2
]}

Dong Z.-F. ^{[1
]}

Zhao G.-Q. ^{[2
]}

Tian N. ^{[2
]}

Zhang S.-K. ^{[2
]}

机构：

[1] School of Mechanical Electronic & Information Engineering, China University of Mining & Technology, Beijing

[2] School of Mechanical Engineering, Guizhou University of Engineering Science, Bijie

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 02期

关键词：

Creep damage; Deformation mechanism; Microstructure; Re/Ru; Single crystal nickel-based superalloy;

D O I：

10.11817/j.ysxb.1004.0609.2021-37713

中图分类号：

学科分类号：

摘要：

The creep behavior and damage feature of a 4.5%Re/3%Ru-containing single crystal nickel-based superalloy at high temperature were investigated of creep property measurement and microstructure observation. The results show that the creep life of alloy at (1100 ℃, 140 MPa) is measured as 476 h. During steady state creep at high temperature, the deformation mechanism of alloy is dislocation slipping in γ matrix and climbing over the rafted γ' phase. In the later stage of creep, the deformation mechanism of alloy is dislocations slipping in γ matrix and shearing into the rafted γ' phase. Wherein the dislocations shearing into γ' phase can cross-slip from {111} to {100} planes to form the configuration of K-W locking + APB, which may improve the creep resistance of alloy. The alternated slipping of a large number of 〈110〉 dislocations causes both the twisting and breaking of the rafted γ/γ' phases and the crystal rotation of γ' phase to form the sub-grain structure, which may reduce the creep resistance of alloy. Furthermore, the alternated activation of the initiation/secondary slipping systems may promote the initiation of cracks occurring in the rafted γ/γ' interface, and the cracks are propagated along the interface perpendicular to the stress axis until creep fracture, which is the damage and fracture mechanism of alloy in the later stage creep at high temperature. © 2021, Science Press. All right reserved.

引用

页码：401 / 409

页数：8

共 24 条

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