Competition between dynamic recovery and recrystallization during hot deformation for TC18 titanium alloy

被引：117
作者：
Ning, Y. Q. [1 ]
Luo, X. [1 ]
Liang, H. Q. [1 ]
Guo, H. Z. [1 ]
Zhang, J. L. [1 ]
Tan, K. [1 ]
机构：
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, Xian 710012, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 635卷
关键词：
Work-hardening; Dynamic recrystallization (DRX); Dynamic recovery (DRV); Hot deformation; Titanium alloys; STRAIN-RATE SENSITIVITY; PLASTIC-DEFORMATION; TI-5AL-5MO-5V-1CR-1FE ALLOY; MICROSTRUCTURE EVOLUTION; MECHANICAL-BEHAVIOR; CONSTITUTIVE MODEL; PROCESSING MAPS; 42CRMO STEEL; FLOW; TEMPERATURES;
D O I：
10.1016/j.msea.2015.03.071
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The competition between dynamic recovery (DRV) and recrystallization (DRX) during hot deformation has been investigated in the present paper. Isothermal compression experiment of TC18 titanium alloy was conducted for verification. The hot deformation mechanism for TC18 alloy has been identified as dislocation evolution from the stress exponent correspondence. Suitable descriptions to dislocation evolution under DRV/DRX have been obtained and validated by stress variation with DRX critical strain as the transition. Work-hardening behaviors correspond to the competition between DRX/DRV and segmented functions were constructed to describe the variation. The influence of alpha/beta phase transformation and DRX evolution on dislocation evolution and work-hardening behaviors has been characterized with the Kocks-Mecking model developed. Power dissipation efficiency and microstructure observation were utilized to demonstrate the dependence of dynamic softening mechanism. The beta necking phenomenon in DRX grains has been associated with the periodic competition between DRX and DRV. (C) 2015 Elsevier B.V. All rights reserved.
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收藏
页码：77 / 85
页数：9
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