loading page

Hot deformation characteristics and kinetics analysis for Nickel-based corrosion resistant alloy
  • +1
  • Lei Wang,
  • Feng Liu,
  • Hongyuan Chen,
  • Qiang Chi
Lei Wang
CNPC Tubular Goods Research Institute
Author Profile
Feng Liu
Northwestern Polytechnical University
Author Profile
Hongyuan Chen
CNPC Tubular Goods Research Institute
Author Profile
Qiang Chi
CNPC Tubular Goods Research Institute
Author Profile

Peer review status:IN REVISION

01 Jun 2020Submitted to Engineering Reports
03 Jun 2020Assigned to Editor
03 Jun 2020Submission Checks Completed
04 Jun 2020Reviewer(s) Assigned
14 Jul 2020Editorial Decision: Revise Minor

Abstract

The hot deformation characteristics of Nickel-based corrosion resistant alloy was studied in the temperature range of 1050~1200oC and the strain rate range of 0.001~0.1s-1 by employing hot compression tests. The results show that the peak stress increases with decreasing temperature and increasing strain rate, and the activation energy is about 409kJ/mol. Basing on the Avrami equation through using the critical strain (εc) and the strain for 50% DRX (ε0.5), a kinetic model for dynamic recrystallization (DRX) was established, where the model parameters could be obtained using the modified Zener-Hollomon parameter (Z*). Applying the model, the predicted value of the steady state strain (εss) and the strain for maximum softening rate (εm) agree well with the experimental results. Accordingly, the relationship between ε m and ε 0.5 is established, which is mainly dependent on the Avrami exponent (n). When n <3.25, εm becomes less than ε0.5 and the difference in between decreases with increasing the strain rate or decreasing the deformation temperature. Finally, through observing DRX microstructure under different deformation conditions, a power law relation between DRX grain size (Ddrx) and Z*, with an exponent of -0.36, was found.