Creep behaviors of fine-grained Ni-base powder metallurgy superalloys at elevated temperatures
点击次数：
影响因子：
6.2
DOI码：
10.1016/j.jallcom.2021.158865
所属单位：
中南大学粉末冶金研究院， 烟台大学
发表刊物：
Journal of Alloys and Compounds
项目来源：
国家科技重大项目（2017-VI-0008-0078），中国国家自然科学基金（NSFC）（91860105，52074366），中国博士后科学基金会（2019M662799），中国山东主要科技创新项目（2019JZZY010325）
关键字：
Powder metallurgy superalloys, Fine grain, Creep, Dislocation, Critical stress
摘要：
In this work, the high temperature creep properties of three newly developed P/M superalloys with fine grains were investigated under conditions of 650 degrees C/1100 MPa, 750 degrees C/690 MPa, and 815 degrees C/550 MPa. The creep behavior associated with microstructure were analyzed, considering the interactions of dislocation with grain boundaries and gamma' phase. The results indicated that the cracks were more likely to initiate at grain boundaries, resulting in intergranular cracking. Moreover, the dislocation movement in grains was strongly related with testing temperature and applied stress, which is explained by theoretical calculation on the composition-dependent critical stresses (CSs) to trigger various mechanisms, including dislocation shearing the gamma' phase by stacking faults (SFs) or APB coupled dislocation pairs, and dislocation climbing. (C) 2021 Elsevier B.V. All rights reserved.
合写作者：
Zexin Wang, Xiangyou Xiao, Yunping Li, Xia Li, Hua Zhang, Lilong Zhu, Liang Jiang, Yong Liu
第一作者：
Feng Liu
论文类型：
Article
通讯作者：
谭黎明, Xia Li
学科门类：
工学
一级学科：
冶金
卷号：
867
ISSN号：
0925-8388
是否译文：
否
学位：博士学位
职称：副研究员
学科：材料科学与工程
所在单位：粉末冶金研究院