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.
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页数：3
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