Processing map and dynamic recrystallization behaviours of 316LN-Mn austenitic stainless steel

Shaolong Sheng; Yanxin Qiao; Ruzong Zhai; Mingyue Sun; Bin Xu

doi:10.1007/s12613-023-2714-6

Volume 30 Issue 12

Dec. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(12): 2386-2396

Shaolong Sheng, Yanxin Qiao, Ruzong Zhai, Mingyue Sun, and Bin Xu, Processing map and dynamic recrystallization behaviours of 316LN-Mn austenitic stainless steel, Int. J. Miner. Metall. Mater., 30(2023), No. 12, pp. 2386-2396. https://doi.org/10.1007/s12613-023-2714-6

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Shaolong Sheng, Yanxin Qiao, Ruzong Zhai, Mingyue Sun, and Bin Xu, Processing map and dynamic recrystallization behaviours of 316LN-Mn austenitic stainless steel, Int. J. Miner. Metall. Mater., 30(2023), No. 12, pp. 2386-2396. https://doi.org/10.1007/s12613-023-2714-6

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Research Article

Processing map and dynamic recrystallization behaviours of 316LN-Mn austenitic stainless steel

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Corresponding authors:
Yanxin Qiao E-mail: yxqiao@just.edu.cn

Mingyue Sun E-mail: mysun@imr.ac.cn
Received: 7 April 2023; Revised: 21 July 2023; Accepted: 25 July 2023; Available online: 27 July 2023

Abstract

Abstract

The hot deformation behaviours of 316LN-Mn austenitic stainless steel were investigated by uniaxial isothermal compression tests at different temperatures and strain rates. The microstructural evolutions were also studied using electron backscatter diffraction. The flow stress decreases with the increasing temperature and decreasing strain rate. A constitutive equation was established to characterize the relationship among the deformation parameters, and the deformation activation energy was calculated to be 497.92 kJ/mol. Processing maps were constructed to describe the appropriate processing window, and the optimum processing parameters were determined at a temperature of 1107–1160°C and a strain rate of 0.005–0.026 s⁻¹. Experimental results showed that the main nucleation mechanism is discontinuous dynamic recrystallization (DDRX), followed by continuous dynamic recrystallization (CDRX). In addition, the formation of twin boundaries facilitated the nucleation of dynamic recrystallization.
- austenitic stainless steel;
- processing map;
- dynamic recrystallization;
- constitutive equation

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