Temperature Dependence of Deformation Behaviors in High Manganese Austenitic Steel for Cryogenic Applications
| Autor: | Zhenyu Liu, Shuang Li, Jia-kuan Ren, Jun Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science Article dislocation structure Ultimate tensile strength General Materials Science Composite material Ductility strength and ductility Austenite Microscopy QC120-168.85 high manganese austenitic steel QH201-278.5 Strain hardening exponent Engineering (General). Civil engineering (General) TK1-9971 Descriptive and experimental mechanics Electrical engineering. Electronics. Nuclear engineering TA1-2040 Deformation (engineering) Dislocation Crystal twinning mechanical twinning Electron backscatter diffraction |
| Zdroj: | Materials Volume 14 Issue 18 Materials, Vol 14, Iss 5426, p 5426 (2021) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma14185426 |
| Popis: | The deformation structure and its contribution to strain hardening of a high manganese austenitic steel were investigated after tensile deformation at 298 K, 77 K and 4 K by means of electron backscatter diffraction and transmission electron microscopy, exhibiting a strong dependence of strain hardening and deformation structure on deformation temperature. It was demonstrated that sufficient twinning indeed provides a high and stable strain hardening capacity, leading to a simultaneous increase in strength and ductility at 77 K compared with the tensile deformation at 298 K. Moreover, although the SFE of the steel is ~34.4 mJ/m2 at 4 K, sufficient twinning was not observed, indicating that the mechanical twinning is hard to activate at 4 K. However, numerous planar dislocation arrays and microbands can be observed, and these substructures may be a reason for multi-peak strain hardening behaviors at 4 K. They can also provide certain strain hardening capacity, and a relatively high total elongation of ~48% can be obtained at 4 K. In addition, it was found that the yield strength (YS) and ultimate tensile strength (UTS) linearly increases with the lowering of the deformation temperature from 298 K to 4 K, and the increment in YS and UTS was estimated to be 2.13 and 2.43 MPa per 1 K reduction, respectively. |
| Databáze: | OpenAIRE |
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