Journal
VACUUM
Volume 149, Issue -, Pages 1-11Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2017.11.021
Keywords
Alloy; Hot deformation; Strain dependence; Metadynamic recrystallization
Funding
- National Natural Science Foundation Council of China [51775564]
- 973 program [2015CB057305]
- Science and Technology Leading Talent in Hunan Province [2016RS2006]
- Natural Science Foundation for Distinguished Young Scholars of Hunan Province [2016 JJ1017]
- Program of Chang Jiang Scholars of Ministry of Education [Q2015140]
- National Postdoctoral Program for Innovative Talents [BX201600193]
- Postdoctoral Science Foundation [2017M612579]
- Natural Science Foundation of Hunan Province [2017JJ3326]
- Scientific Research Fund of Hunan Province Education Department [17B009]
- Postdoctoral International Exchange Program, Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle, College of Hunan Province [2016KF1603]
- Open End Fund for the Valuable and Precision Instruments of Central South University, China [CSUZC201722]
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The metadynamic recrystallization (MDRX) behaviors of a solid-solution GH4169 superalloy were studied by two-pass hot compression tests. The effects of pre-strain (deformation degree of the first pass) on MDRX behaviors were analyzed. Results show that the MDRX behaviors intensely depend on the pre-strain. The MDRX fraction first increases and then drops with the increased pre-strain. This is because a relatively large pre-strain can facilitate the nucleation of dynamic recrystallization (DRX) grains, which promotes the subsequent MDRX behaviors. However, due to the decreased stored deformation energy at relatively high pre-strain, the number of DRX grains cannot continuously increases. Thus, the MDRX fraction is reduced with the further increase of pre-strain. The segmented MDRX kinetics models were proposed and validated to describe the significant strain dependence of MDRX behaviors. (C) 2017 Elsevier Ltd. All rights reserved.
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