Strain hardening behavior, strain rate sensitivity and hot deformation maps of AISI 321 austenitic stainless steel

Mehdi Shaban Ghazani; Beitallah Eghbali

doi:10.1007/s12613-020-2163-4

Volume 28 Issue 11

Nov. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(11): 1799-1810

Mehdi Shaban Ghazani and Beitallah Eghbali, Strain hardening behavior, strain rate sensitivity and hot deformation maps of AISI 321 austenitic stainless steel, Int. J. Miner. Metall. Mater., 28(2021), No. 11, pp. 1799-1810. https://doi.org/10.1007/s12613-020-2163-4

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Mehdi Shaban Ghazani and Beitallah Eghbali, Strain hardening behavior, strain rate sensitivity and hot deformation maps of AISI 321 austenitic stainless steel, Int. J. Miner. Metall. Mater., 28(2021), No. 11, pp. 1799-1810. https://doi.org/10.1007/s12613-020-2163-4

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Research Article

Strain hardening behavior, strain rate sensitivity and hot deformation maps of AISI 321 austenitic stainless steel

Mehdi Shaban Ghazani¹ and
Beitallah Eghbali^2,

+ Author Affiliations

Corresponding author:
Beitallah Eghbali E-mail: eghbali@sut.ac.ir
Received: 25 April 2020; Revised: 3 August 2020; Accepted: 5 August 2020; Available online: 10 August 2020

Abstract

Abstract

Hot compression tests were performed on AISI 321 austenitic stainless steel in the deformation temperature range of 800–1200°C and constant strain rates of 0.001, 0.01, 0.1, and 1 s⁻¹. Hot flow curves were used to determine the strain hardening exponent and the strain rate sensitivity exponent, and to construct the processing maps. Variations of the strain hardening exponent with strain were used to predict the microstructural evolutions during the hot deformation. Four variations were distinguished reflecting the different microstructural changes. Based on the analysis of the strain hardening exponent versus strain curves, the microstructural evolutions were dynamic recovery, single and multiple peak dynamic recrystallization, and interactions between dynamic recrystallization and precipitation. The strain rate sensitivity variations at an applied strain of 0.8 and strain rate of 0.1 s⁻¹ were compared with the microstructural evolutions. The results demonstrate the existence of a reliable correlation between the strain rate sensitivity values and evolved microstructures. Additionally, the power dissipation map at the applied strain of 0.8 was compared with the resultant microstructures at predetermined deformation conditions. The microstructural evolutions strongly correlated to the power dissipation ratio, and dynamic recrystallization occurred completely at lower power dissipation ratios.
- strain hardening;
- strain rate sensitivity;
- processing map;
- AISI 321 austenitic stainless steel;
- hot compression

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