Superplastic behavior of a powder metallurgy superalloy during isothermal compression
点击次数：
影响因子：
10.9
DOI码：
10.1016/j.jmst.2019.05.025
所属单位：
中南大学粉末冶金研究院
发表刊物：
Journal of Materials Science & Technology
项目来源：
中国国家重点研究与发展计划（No.2016YFB0701404），中国国家自然科学基金（91860105）和广东省引进的创新与企业家团队基金（201301G0105337290）
关键字：
Nickel-based superalloy, Superplastic deformation, Dynamic recrystallization, Grain boundary sliding, Hot compression
摘要：
In this work, the flow behaviors and microstructure evolution of a powder metallurgy nickel-based superalloy during superplastic compression is investigated. Based on the strain rate sensitivity m determined by flow data, superplastic region is estimated at relatively low temperature and strain rate domains, specifically around 1000 degrees C/10(-3)s(-1). Thereafter, the cylinder specimens are isothermally compressed at 1000 degrees C/10(-3)s(-1) and 1025 degrees C/10(-3)s(-1) with different strains, to exam the superplasticity and related mechanisms. The experimental results indicate that the accumulated dislocations are mainly annihilated by dynamic recovery and dynamic recrystallization (DRX), and the grain boundary sliding (GBS) contributes to the total strain during superplastic compression as well. In addition, the cavities and cracks at triple junctions or interfaces between matrix and second phase particle have not been detected, which is different from superplastic tensile deformation. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
合写作者：
Yunping Li, Yan Nie, Liang Jiang
第一作者：
谭黎明
论文类型：
Article
通讯作者：
Feng Liu
学科门类：
工学
一级学科：
冶金
卷号：
35
页面范围：
2591-2599
ISSN号：
1005-0302
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