EFFECTS OF WATER QUENCHING PROCESS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TWIP STEEL
Received date: 2009-03-20
Revised date: 2009-08-28
Online published: 2010-02-10
Supported by
Supported by Office of Education of Liaoning Province (No.20060430)
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.
Key words： TWIP steel; water quenching; deformed twin; microstructure; mechanical property
LI Ji-Guang . EFFECTS OF WATER QUENCHING PROCESS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TWIP STEEL[J]. Acta Metall Sin, 2010 , 46(2) : 221 -226 . DOI: 10.3724/SP.J.1037.2009.00180
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