期刊
MATERIALS CHARACTERIZATION
卷 184, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2021.111689
关键词
Austenitic stainless steel; Cold rolling; Microstructure; Deformation; Mechanical property
类别
资金
- National Natural Science Foundation of China [U20A20277, U20A20279]
This study investigated the impact of pre-deformation on the structure-deformation-property relationship in Cr-Mn-N austenitic stainless steel. The results showed that the microstructure varied with the increase of pre-reduction deformation, resulting in increased strength and decreased plasticity. These changes in mechanical properties were related to the variations in microstructuredependent deformation mechanisms.
The present study aimed to investigate the impact of pre-deformation on the structure-deformation-property relationship in Cr-Mn-N austenitic stainless steel (ASS). The commercial Cr-Mn-N ASS was cold-rolled (CR) at room temperature with a thickness reduction from 5% to 60%, whose microstructural characteristics were identified by optical microscopy, scanning and transmission electron microscopy, and electron backscatter diffraction together with X-ray diffraction. The results indicated that the microstructure varied from equiaxed austenite in the as-received specimen to the coexistence of stacking faults (SFs), deformation twins (DTs) and strain-induced martensite (SIM) in pre-deformed specimens. Furthermore, detailed TEM results showed that equiaxed dislocation cells, DT nets and dislocation-cell-type alpha'-M occurred in the 60% CR specimen. Tensile tests revealed that the strength of ASS increased while the plasticity decreased with the increase of pre-reduction deformation. Such mechanical properties were confirmed to be related to the variations in microstructuredependent deformation mechanisms, varying from planar slip + DTs + SIM in the as-received specimen, to DTs + SIM with 30% reduction, and SIM + minor twinning with 60% reduction, respectively, in the predeformed specimens.
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