Extended Strain Hardening by a Sequential Operation of Twinning Induced Plasticity and Transformation Induced Plasticity in a Low Ni Duplex Stainless Steel

被引：27
|
作者：
Choi, Jeom Yong [1 ]
Hwang, Si Woo [2 ]
Ha, Min Chul [2 ]
Park, Kyung-Tae [2 ]
机构：
[1] POSCO Tech Res Lab, STS Prod Grp, Pohang 790785, South Korea
[2] Hanbat Natl Univ, Dept Mat Sci & Engn, Taejon 305719, South Korea
来源：
METALS AND MATERIALS INTERNATIONAL | 2014年 / 20卷 / 05期
关键词：
metals; deformation; microstructure; transmission electron microscopy; tensile properties; DEFORMATION MICROSTRUCTURE; FCC->HCP TRANSFORMATION; MARTENSITE FORMATION; TRIP; NUCLEATION; CORROSION; MECHANISM; BEHAVIOR;
D O I：
10.1007/s12540-014-5014-x
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：893 / 898
页数：6
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