Impact Factor:6.2
DOI number:10.1016/j.jallcom.2019.03.080
Affiliation of Author(s):中南大学粉末冶金研究院
Teaching and Research Group:高温结构材料研究所
Journal:Journal of Alloys and Compounds
Funded by: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）
Key Words:Powder metallurgy superalloy, High-strain-rate deformation, Adiabatic heating, Dynamic softening
Abstract: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.
Co-author:Yunping Li, Feng Liu, Yan Nie, Liang Jiang
First Author:Liming Tan
Indexed by:Article
Correspondence Author:Feng Liu
Discipline:Engineering
First-Level Discipline:冶金
Volume:789
Page Number:506-517
ISSN No.:0925-8388
Translation or Not:no