Constitutive models to predict flow stress in Austenitic Stainless Steel 316 at elevated temperatures

2013 ◽  
Vol 43 ◽  
pp. 410-418 ◽  
Author(s):  
Amit Kumar Gupta ◽  
V.K. Anirudh ◽  
Swadesh Kumar Singh
Keyword(s):  
Stainless Steel ◽  
Flow Stress ◽  
Austenitic Stainless Steel ◽  
Elevated Temperatures ◽  
Constitutive Models ◽  
Stainless Steel 316

scholarly journals MODIFIED PHYSICALLY-BASED CONSTITUTIVE MODEL FOR As-CAST Mn18Cr18N AUSTENITIC STAINLESS STEEL AT ELEVATED TEMPERATURES

2021 ◽  
Vol 55 (2) ◽  
pp. 243-251
Author(s):  
Jihong Tian ◽  
Fei Chen ◽  
Fengming Qin ◽  
Jiansheng Liu ◽  
Huiqin Chen
Keyword(s):  
Stainless Steel ◽  
Flow Stress ◽  
Austenitic Stainless Steel ◽  
Constitutive Model ◽  
Hot Deformation ◽  
Elevated Temperatures ◽  
Strain Rate Range ◽  
Compression Tests ◽  
Recovery Coefficient ◽  
Physically Based

The hot-deformation behavior of the as-cast Mn18Cr18N high-nitrogen austenitic stainless steel, produced with the electroslag-remelting metallurgical technology, was studied using isothermal-compression tests in a temperature range of 1223–1473 K) and a strain-rate range of 0.001–1 s–1). The flow-stress curves of the Mn18Cr18N steel were obtained under different hot-deformation conditions. By establishing the hyperbolic sine-law Zener-Hollomon equation, the hot-deformation activation energy of the Mn18Cr18N steel was obtained. Based on the mechanism of dislocation evolution, a physically-based constitutive model was established. In addition, the expression of the dynamic-recovery coefficient of the model was modified. Compared with the model before the modification, the modified constitutive model could effectively improve the prediction accuracy of the flow stress for the as-cast Mn18Cr18N austenitic stainless steel.

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