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Metals 2017, 7(5), 161; doi:10.3390/met7050161

Critical Condition of Dynamic Recrystallization in 35CrMo Steel

1
College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
2
Light Alloy Research Institute, Central South University, Changsha 410012, China
3
State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Robert Tuttle
Received: 15 April 2017 / Revised: 1 May 2017 / Accepted: 4 May 2017 / Published: 9 May 2017
(This article belongs to the Special Issue Alloy Steels)
View Full-Text   |   Download PDF [7429 KB, uploaded 9 May 2017]   |  

Abstract

The compression deformation behaviors of 35CrMo steel at different conditions was studied by using Gleeble-3810 thermo-simulation machine under large strain. The results indicate that the flow stress curves of 35CrMo steel is affected by strain rate and deformation temperature, showing the characteristics of dynamic recovery (DRV) and dynamic recrystallization (DRX), which is the main softening mechanism of 35CrMo steel. The activation energy (Q) and Zener–Hollomon parameter (Z parameter) expression for thermal deformation of this steel was calculated by linear regression. The inflection point on the curve of strain hardening rate and flow stress (θ-σ curve) corresponds to the beginning of DRX, and the critical strain of DRX increases with the decrease of deformation temperature and the increase of strain rate. Based on the inflection point criterion, the constitutive equation of the critical strain of DRX of 35CrMo steel was established: εc = 0.000232Z0.1673, which reflects the variation of the critical strain of DRX with the Z parameter. In addition, through metallographic observation, the rationality of the inflection point criterion in determining the critical strain of DRX of 35CrMo steel was verified, and the DRX state diagram was established. View Full-Text
Keywords: 35CrMo steel; dynamic recrystallization; work hardening; critical condition 35CrMo steel; dynamic recrystallization; work hardening; critical condition
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Huang, Y.; Wang, S.; Xiao, Z.; Liu, H. Critical Condition of Dynamic Recrystallization in 35CrMo Steel. Metals 2017, 7, 161.

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