| RESEARCH PAPER |
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Influence of Partition Time on Mechanical Properties and
Microstructure of Q&P Steel |
| LI Hui1, MI Zhenli2, ZHANG Hua3, ZHAO Qi1
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1 College of Engineering,Yantai Nanshan University, Yantai 265700;
2 Engineering Research Institute,University of Science and Technology Beijing, Beijing 100083;
3 National Engineering Research Center for Plastic Working of Aluminum Alloys, Shandong Nanshan Aluminum Co., Ltd., Yantai 265713 |
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Abstract Based on the regulating and controlling theory of thermodynamic, the microstructure evolution and mechanical properties of a new designed medium-carbon-manganese steel after Q&P process was studied by SEM,EBSD and TEM. The mecha-nical properties was tested,and the evolution mechanism of retained austenite was discussed by XRD. The results indicated that the microstructure was consisted of lath martensite and dispersively distributed retained austenite; the retained austenite was emerged in the form of thin film between martensite laths and blocks along the grain boundaries; the strength decreased and the elongation increased with the increase of partition time; the fraction of retained austenite decreased from 6.94%-10.78% to 3.5%-4.5% after tensile test, which indicated the occurrence of TRIP effect and the increase of ductility.
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Published: 25 February 2017
Online: 2018-05-02
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2017, Vol. 31 
