期刊
METALS AND MATERIALS INTERNATIONAL
卷 20, 期 5, 页码 893-898出版社
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-014-5014-x
关键词
metals; deformation; microstructure; transmission electron microscopy; tensile properties
资金
- POSCO [2012X011]
Extended strain hardening was realized by a sequential operation of twinning induced plasticity (TWIP) followed by transformation induced plasticity (TRIP) in a Fe-20Cr-3Mn-2Cu-1Ni-1Si-0.2N duplex stainless steel (DSS). As a result, the present DSS exhibited an excellent combination of strength - ductility of 900 MPa which was 75% superior to that of conventional DSSs. The deformed microstructures of the present DSS revealed that strain induced martensite (SIM) causing TRIP primarily nucleated at intersections of mechanical twins without formation of E martensite which is an intermediate phase during SW transformation. In addition, the sequential operation of TWIP-TRIP enables strain hardening to be extended to higher strains compared to the operation of TWIP alone.
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