Mechanical properties of cryogenically-rolled type 321 metastable austenitic steel

Open School-Conference of NIS Countries Ultrafine Grained and Nanostructured Materials

Aletdinov, A.F.^1 ; Korznikova, G.F.^1 ; Mironov, Yu S.^2 ; Zaripova, R.G.^3 ; Myshlyaev, M.M.^4,5

Institute for Metals Superplasticity Problems, Russian Academy of Science, Ufa

450001, Russia^1

Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai

980-8579, Japan^2

Ufa State Aviation Technical University, Ufa

450000, Russia^3

Baikov Institute of Metallurgy and Material Science, Russian Academy of Science, Moscow

119334, Russia^4

Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka

142432, Russia^5

关键词: Electron backscatter diffraction technique;    Mechanical behaviour;    Mechanical characteristics;    Metastable austenitic steels;    Rolling reduction;    Strain induced martensitic transformation;    Thickness reduction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012036/pdf
DOI  :  10.1088/1757-899X/447/1/012036

来源: IOP

【 摘 要 】

In this work, the mechanical behaviour of cryogenically-rolled type 321 metastable austenitic steel was studied. For this purpose, the material was rolled at a temperature of liquid-nitrogen to degrees of rolling reduction, the evolved grain structure was characterized by the electron-backscatter diffraction (EBSD) technique and mechanical properties were evaluated by tensile tests. It has been shown that rolling to 10 pct. of thickness reduction resulted in the extensive strain-induced martensitic transformation thus giving rise to abrupt material strengthening as well as essential degradation of ductility. However, with a further increase in the rolling strain, the volume fraction of martensite tended to saturate thereby leading to stabilization of the mechanical characteristics.