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| EFFECTS OF WATER QUENCHING PROCESS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TWIP STEEL |
| LI Jiguang1; DING Yajie1; PENG Xingdong1; LIU Jinwei2 |
1.School of Materials Science and Engineering; University of Science and Technology Liaoning; Anshan 114051
2.Department of Engineering; Anshan Iron and Steel Company; Anshan 114021 |
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Cite this article:
LI Jiguang DING Yajie PENG Xingdong LIU Jinwei. EFFECTS OF WATER QUENCHING PROCESS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TWIP STEEL. Acta Metall Sin, 2010, 46(2): 221-226.
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Abstract In order to reduce greenhouse gas emissions, improve fuel economy and enhance safety of automobiles, a new high–strength and high–plasticity twinning induced plasticity (TWIP) steel containing medium carbon and high manganese has been developed. The effects of water quenching
process on the microstructures of such TWIP steels and deformed ones were observed by OM, SEM and TEM, and effects on the mechanical properties were investigated by unidirectional tensile. The experimental results show that the volume fraction of annealing twins and the average size of grains, the plasticity and the strain hardening capability of TWIP steel increase with the increase of water quenching temperature, but the strength and the yield ratio decrease with it. Therefore, the samples could be obtained with a better comprehensive property, that is, the tensile strenth is 960 MPa, the elongation percentage is 60.5% and the strength–plasticity product achieves the maximum value of 6.096 ×104 MPa·%. It is also found that the austenite with a loof annealing twins can be transformed into deformation twins with the increase of the deformation degree, so that the strength and plasticity of TWIP steel are improved.
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Received: 20 March 2009
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| Fund: Supported by Office of Education of Liaoning Province (No.20060430) |
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