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| Tailored properties of a novelly-designed press-hardened 22MnMoB steel |
| Ming-bo Zhou1,Jing-lin Tang1,*,Jie Yang2,Cun-yu Wang3 |
1 Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University, Ministry of Education of China, Qinhuangdao 066004, Hebei, China
2 Lightweight Research Department, Society of Automotive Engineers of China, Beijing 100055, China
3 Central Iron & Steel Research Institute, Beijing 100081, China |
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Abstract A novel 22MnMoB hot stamping steel was designed. The continuous cooling transformation (CCT) measurement of the 22MnMoB steel showed that the ferrite-bainite microstructure could be obtained at cooling rates lower than 25��C/s, and the complete martensite structure required the cooling rate higher than 30��C/s. The experiments with non-uniform die temperatures were carried out to obtain tailored properties. The results showed that strength of 1411 MPa and elongation of 6% could be obtained in the hard zone, and strength of 916 MPa and elongation of 9% could be obtained in the soft zone, which can be realized by controlling the die temperature at 400��C. The transition zone was found smooth and could be beneficial to reduce the stress concentration and therefore improve the performance of components.
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Received: 04 January 2017
Published: 12 May 2017
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| Fund:National Natural Science Foundation of China;Fundamental Research Funds for the Central Universities |
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Corresponding Authors:
������ MingBo
E-mail: mbzhou@163.com
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2017, Vol. 24 
