Microstructure evolutions of a powder metallurgy superalloy during high-strain-rate deformation
发布时间：2019-04-26
点击次数：
影响因子：6.2
DOI码：10.1016/j.jallcom.2019.03.080
所属单位：中南大学粉末冶金研究院
教研室：高温结构材料研究所
发表刊物：Journal of Alloys and Compounds
项目来源：中国国家重点研究与发展计划(2016YFB0701404),中国国家自然科学基金（NSFC）（91860105），广东省创新与企业家团队（201301G0105337290）
关键字：Powder metallurgy superalloy, High-strain-rate deformation, Adiabatic heating, Dynamic softening
摘要：To investigate the microstructure evolution of powder metallurgy (P/M) superalloys during high-strainrate deformation, a P/M nickel-base superalloy is subjected to thermal compression at temperatures ranging from 1000 degrees C to 1100 degrees C and strain rates ranging from 1 s(-1) to 10 s(-1). The analysis regarding the flow behaviors and microstructure observation indicates that discontinuous softening is significant at high strain rates. Moreover, based on experimental measurement and theoretic estimation, the adiabatic heating under high-strain-rate deformation is hardly neglectable, which enhances the dynamic softening via dynamic recovery (DRV), dynamic recrystallization (DRX), and grain growth. In order to obtain refined and homogeneous grains, deformation at temperature range of 1025-1050 degrees C with strain rate rang of 1-10 s(-1) or at 1000 degrees C/1 s(-1) is suggested for high-strain-rate compression on the P/M superalloy, where DRX plays more dominating roles. (C) 2019 Elsevier B.V. All rights reserved.
合写作者：Yunping Li, Feng Liu, 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：789
页面范围：506-517
ISSN号：0925-8388
是否译文：否
发表时间：2019-04-26