Creep behaviour of a novel CoNi-base single-crystal superalloy at high temperature and low stress

被引：11

作者：

He, Jinshan ^{[1
]}

Zou, Min ^{[2
]}

Li, Longfei ^{[2
]}

Wang, Xitao ^{[1
]}

Feng, Qiang ^{[2
]}

机构：

[1] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Collaborat Innovat Ctr Steel Technol, Beijing 100083, Peoples R China

[2] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

来源：

MATERIALS LETTERS | 2020年 / 262卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

CoNi-base single-crystal alloy; Creep; Deformation and fracture; Lattice misfit; Substructure; MO; DEPENDENCE; ALLOYS;

D O I：

10.1016/j.matlet.2019.127042

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The tensile creep behaviour of a novel CoNi-base single-crystal superalloy was investigated at 1093 degrees C/62 MPa. The rupture life of this alloy reached 140 h, which was mainly attributed to a high fraction of gamma' phase. The interrupted creep test at 0.5% strain indicated that no rafting structure formed and gamma' phase remained a spherical morphology during creep, due to the small lattice misfit, 0.024% at 1093 degrees C. Shearing gamma' phase by multiple dislocations was the predominant substructure configuration in the steady-state stage, instead of planar defects which are commonly reported during relatively low-temperature creep of Co and CoNi-base single-crystal superalloys. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：3

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