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A novel 22 MnMoB 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 1 411 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.
A novel 22 MnMoB 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 The experiments showed non-uniform die temperatures were carried out to obtain tailored properties. The results showed that strength of 1 411 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 to be smooth and could be to reduce the stress concentration and therefore improve the performance of components.