Flow stress constitutive relationship and processing map of super duplex stainless steel 2507

doi:10.13251/j.issn.0254-6051.2022.01.016

Abstract

Abstract: Hot deformation behavior of super duplex stainless steel 2507 was investigated by using Gleeble-3800 thermal simulation testing machine under the conditions of hot deformation temperature of 950-1200 ℃ and strain rate of 0.01-10 s^-1. And the microstructure evolution in different deformation processes was observed with the help of optical microscope. Based on the experimental data analysis, the flow stress constitutive relationship and processing maps of the super duplex stainless steel 2507 were established. The results show that the flow stress gradually decreases with the increase of deformation temperature and the decrease of strain rate, and the rheological curves appear as “yield-like platform” at a high strain rate. The activation energy of hot deformation and the stress index of the steel are 414.57 kJ·mol^-1 and 5.18, respectively. The peak stress constitutive equation is ε·=3.69×10¹⁵[sinh(0.0101σ)]^4.18exp-414.57RT. According to the microstructure analysis and processing maps, the optimized process range of the steel is the deformation temperature of 1060-1120 ℃ and the strain rate of 0.01-0.1 s^-1.

Key words: super duplex stainless steel 2507, hot deformation, constitutive equation, processing map

CLC Number:

TG142.71

He Chan, Zou Dening, Zhao Jie, Chen Xingrun, Qian Zhangxin. Flow stress constitutive relationship and processing map of super duplex stainless steel 2507[J]. Heat Treatment of Metals, 2022, 47(1): 94-99.

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