EBSD study of a hot deformed nickel-based superalloy

被引：559

作者：

Lin, Y. C. ^{[1
,2
,3
]}

Wu, Xian-Yang ^{[1
,2
]}

Chen, Xiao-Min ^{[1
,2
]}

Chen, Jian ^{[4
]}

Wen, Dong-Xu ^{[1
,2
]}

Zhang, Jin-Long ^{[1
,2
]}

Li, Lei-Ting ^{[1
,2
]}

机构：

[1] Cent S Univ, Sch Mech & Elect Engn, Changsha 410083, Peoples R China

[2] Cent S Univ, Light Alloy Res Inst, Changsha 410083, Peoples R China

[3] State Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China

[4] Changsha Univ Sci & Technol, Key Lab Efficient & Clean Energy Utilizat, Sch Energy & Power Engn, Changsha 410114, Hunan, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 640卷

基金：

中国国家自然科学基金;

关键词：

Hot deformation; Grain boundaries; Dynamic recrystallization; DYNAMIC RECRYSTALLIZATION BEHAVIOR; NI-BASED SUPERALLOY; TENSILE DEFORMATION BEHAVIORS; MICROSTRUCTURAL EVOLUTION; STAINLESS-STEEL; PROCESSING MAP; FLOW BEHAVIOR; 42CRMO STEEL; STRAIN-RATE; FRACTURE CHARACTERISTICS;

D O I：

10.1016/j.jallcom.2015.04.008

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Hot deformation behaviors of a typical nickel-based superalloy are investigated by isothermal compression tests under the deformation temperature range of 920-1040 degrees C and strain rate range of 0.001-1 s(-1). Scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) technique and transmission electron microscopy (TEM) are employed to study the evolution of hot deformed microstructures. It is found that the fraction of low angle grain boundaries decreases with the increase of deformation temperature or the decrease of strain rate. This is related to the decrease of dynamic recrystallization degree under the low deformation temperature or high strain rate. The fraction of low angle grain boundaries shows a rapid increase at the relatively small deformation degree, and then a significant decrease due to the progress of dynamic recrystallization (DRX). The microstructural changes indicate that both continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) take place during hot deformation. However, the small fraction of low angle boundaries with 10-15 degrees misorientation indicates that the CDRX plays a minor role on the nucleation of dynamic recrystallization. Discontinuous dynamic recrystallization (DDRX) characterized by grain boundary bulging is the dominant nucleation mechanism for the studied superalloy. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：101 / 113

页数：13

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