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The dynamic recrystallization evolution and kinetics of Ni–18.3Cr–6.4Co–5.9W–4Mo–2.19Al–1.16Ti superalloy during hot deformation

Published online by Cambridge University Press:  16 April 2015

Hongbin Zhang ,
Kaifeng Zhang ,
Shaosong Jiang  and
Zhen Lu
Hongbin Zhang*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Kaifeng Zhang
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Shaosong Jiang
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Zhen Lu
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The dynamic recrystallization (DRX) behavior of Ni–18.3Cr–6.4Co–5.9W–4Mo–2.19Al–1.16Ti superalloy was investigated by means of isothermal compression tests in the temperature range of 1010–1160 °C and strain rate range of 0.001–1 s−1. It was found that the nucleation mechanisms of discontinuous DRX and continuous DRX (CDRX) occurred simultaneously during hot deformation, and twinning can play an important role in improving the process of DRX. There are three stages in the process of CDRX, i.e., the accumulation and rearrangement of dislocations, the formation of subgrain boundary, and the conversion to high angle grain boundaries (HAGBs) from subgrain boundary. Moreover, the effect of CDRX grows weaker with increasing deformation temperature and decreasing strain rate. Additionally, both the volume fraction of DRX grains and the DRX grain size were closely related to the deformation temperature and strain rate, and a power exponent relationship between the DRX grain size and Z parameter was obtained. Based on the experimental data, the kinetic equations were also developed to evaluate the volume fraction of DRX grains during hot deformation in the alloy.

Keywords

superalloydynamic recrystallizationnucleation mechanismkinetics equations
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 7 , 14 April 2015 , pp. 1029 - 1041
Copyright
Copyright © Materials Research Society 2015 

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