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Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation.

Authors :
Yang QM
Lin YC
Chen MS
Chen ZJ
Source :
Materials (Basel, Switzerland) [Materials (Basel)] 2022 Jun 06; Vol. 15 (11). Date of Electronic Publication: 2022 Jun 06.
Publication Year :
2022

Abstract

The dynamic recrystallization (DRX) features and the evolution of the microstructure of a new hot isostatic pressed (HIPed) powder metallurgy (P/M) superalloy are investigated by hot-compression tests. The sensitivity of grain dimension and DRX behavior to deformation parameters is analyzed. The results reveal that the DRX features and grain-growth behavior are significantly affected by deformation conditions. The DRX process is promoted with a raised temperature/true strain or a reduced strain rate. However, the grains grow up rapidly at relatively high temperatures. At strain rates of o.1 s <superscript>-1</superscript> and 1 s <superscript>-1</superscript> , a uniform microstructure and small grains are obtained. Due to the obvious differences in the DRX rate at various temperatures, the piecewise DRX kinetics equations are proposed to predict the DRX behavior. At the same time, a mathematical model for predicting the grain dimension and the grain growth behavior is established. To further analyze the DRX behavior and the changes in grain dimension, the hot deformation process is simulated. The developed grain-growth equation as well as the piecewise DRX kinetics equations are integrated into DEFORM software. The simulated DRX features are consistent with the test results, indicating that the proposed DRX kinetics equations and the established grain-growth model can be well used for describing the microstructure evolution. So, they are very useful for the practical hot forming of P/M superalloy parts.

Details

Language :
English
ISSN :
1996-1944
Volume :
15
Issue :
11
Database :
MEDLINE
Journal :
Materials (Basel, Switzerland)
Publication Type :
Academic Journal
Accession number :
35683328
Full Text :
https://doi.org/10.3390/ma15114030