Study on 22MnB5 Steel Microstructure in Hot Forming Progress

Abstract:

Hot forming is a method to make products with ultra high strength steels which typically used in automotive sector. 22MnB5 is one of the most typical hot forming steels. In this paper, hot forming process of 22MnB5 steel is simulated by thermo-mechanical coupled FE software Pam-stamp 2011. Through the simulation the temperature distribution and martensite phase fraction of hot forming part can be obtained. Besides, a hot forming experiment was set up. The tensile strength and Vickers hardness of hot samples which take from the hot formed part are measured. The experimental results indicate that the value of Vickers hardness in side wall is higher. The microstructure investigations have shown that the part after hot forming mostly fully martensitic microstructures. The result from simulation show good agreement with experimental results.

• Periodical: Advanced Materials Research (Volumes 602-604)
• Pages: 1975-1979
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.602-604.1975
• Online since: December 2012
• Authors: Meng Chen, Da Sen Bi, Liang Chu, Xian Chen Gao, Pei Lin Li
• Keywords: Hot Forming, Microstructure Analysis, Thermo-Mechanical Coupled

References

[1] Turetta A,Ghiotti A,Bruschi S (2006). Investigationof 22MnB5 Formability in Hot Stamping Operations. Journal of Material Processing Technology 177:396–400.

DOI: 10.1016/j.jmatprotec.2006.04.041

[2] Shapiro B. Using LS-DYNA for Hot Stamping. 7th European LS-DYNA conference in 2009.

[3] Merklein M, Lechler J, Go ¨del V, Bruschi S, Ghiotti A, Truetta A (2007) Mechan-ical Properties and Plastic Anisotropy of the Quenchenable High Strength Steel 22MnB5 at Elevated Temperatures. in Micari F, Geiger M, Duflou J, Shirvani B, Clarke R, Di Lorenzo R, Fratini L, (Eds.) Proceedings of the 12th International Conference on Sheet Metal, Zu ¨rich. Trans Tech Publications Ltd., Palermo, Italy

[4] Gu Zheng-wei, Shan Zhong-de, Xu Hong, et al. Hot forming technology of automotive high strength steel sheet stamping part [J]. Mould Industry, 2009 , 35(4):27-29.

[5] MA Ning, HU Ping, SHEN Guo-zhe, et al. Model and numerical simulation of hot forming [ A ] . ISAS Conference Proceedings [ C ] . Beijing: Metallurgical Industry Press, 2009. 362- 367.

[6] Lorenz D., Roll, K., 2005, Modelling and Analysis of Integrated Hot forming and Quenching Processes, Advanced Materials Research, 6/8:787-794.

[7] H. Karbasian, A.E. Tekkaya (2010). A review on hot stamping. Journal of Material Processing Technology 210 :2103–2118.

DOI: 10.1016/j.jmatprotec.2010.07.019