Effect of large plastic deformation on microstructure and mechanical properties of a TWIP steel

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Yanushkevich, Z.^1 ; Belyakov, A.^1 ; Kaibyshev, R.^1 ; Molodov, D.^2

Belgorod State University, Belgorod 308015, Russia^1

Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, 52056 Aachen, Germany^2

关键词: High dislocation density;    Large plastic deformation;    mechanical twining;    Micro-structure evolutions;    microshear bands;    Microstructure and mechanical properties;    TWIP steel;    Ultimate tensile strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012064/pdf
DOI  :  10.1088/1757-899X/63/1/012064

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The effect of cold rolling on the microstructure evolution and mechanical properties of a cold rolled Fe-0.3C-17Mn-1.5AI TWIP steel was studied. The plate samples were cold rolled with reductions of 20, 40, 60 and 80%. The structural changes were associated with the development of deformation twinning and shear bands. The average spacing between twin boundaries in the transverse section of the rolled plates decreased from ∼190 to 36 nm with an increase in the rolling reduction from 20 to 40%. Upon further rolling to 80% reduction the twin spacing remained at about 30 nm. The cold rolling resulted in significant increase in strength as revealed by tensile tests at an ambient temperature. The offset yield stress approached 1440 MPa, and the ultimate tensile strength increased to 1630 MPa after rolling reduction of 80%. Such significant strengthening was attributed to the development of specific structure consisting of deformation nanotwins with high dislocation density.