Mechanical Properties and Microstructure of High-Strength Steel Controlled by Hot Stamping Process
- 27 Downloads
A novel design and manufacturing method, dubbed “precast,” of the cooling system and tools for a hot forming process was proposed in this paper. The integrated structures of the punch and blank holder were determined by analyzing the bending and reverse-bending deformation of the forming parts. The desired crashworthiness performance of an automotive front bumper constructed with this process was obtained by a tailored phase transformation, which generated martensite-bainite in the middle and full martensite transformation in the corner areas. Varying cooling effects in the formed parts caused the highest temperature to be located in the bottom and the lowest on the end of the formed parts. Moreover, the microstructural distributions demonstrated that the bottom possessed a relatively lower content of martensite, while, conversely, the end possessed a higher content. This was precisely the most desired phase distributions for the hot formed parts. For the six-process cycle stamping, the temperatures reached a stable status after an initial rapid increase in the first three process cycles. The microstructural results verified the feasibility of the hot forming tools under multiprocess cycles.
Keywordscooling system hot stamping high-strength steel precast
This project is supported by the Key Project of Chinese National Programs (No. 2016YFB0101704) and the National Key Research and Development Program of Hunan Province (2017GK2090). We thank Sara Maccagnano-Zacher, Ph.D., from Liwen Bianji, Edanz Editing China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
Conflict of interest
The authors declare that they have no conflict of interest.
- 2.H.Z. Li, X. Wu, and G.Y. Li, Prediction of Forming Limit Diagrams for 22MnB5 in Hot Stamping Process, J. Mater. Eng. Perform., 2013, 22, p 2131–2140Google Scholar
- 17.T. Stöhr, M. Merklein, and J. Lechler, Investigations on Different Strategies for Influencing the Microstructural Properties with Respect to Partial Hot Stamping. In: 2nd International Conference on Hot Sheet Metal Forming of High-Performance Steel, ed. by M. Merklein, 15–17 June 2009 (Luleå), Verlag Wissenschaftliche Scripten, 2009, p 273–281Google Scholar
- 18.J. Brecht, B. Goeddeke, and K. Mongkolkaji, Warmgeformte Tailor Rolled Products, Funktionsoptimaler Leichtbau für die Fahrzeugkarosserie, In: Proceedings of the 8th Erlanger Workshop Warmblechumformung, ed. by M. Merklein, 12 Nov 2013 (Erlangen), Lehrstuhl für Fertigungstechnologie, p 85–94 (in German)Google Scholar
- 19.Y.Q. Zhu and J.L. Wang, Study of a SUV Bumper’s Crashworthiness Based on TRB Structure, Front. Mech. Eng., 2013, 4, p 53–56Google Scholar
- 20.H. Karbasian A. Brosiu, A. E. Tekkaya, J. Lechler, and M. Merklein, Numerical process design of hot stamping processes based on verified thermo-mechanical characteristics, In: Materials Science and Technology Conference (MS&T), ed. by M. Merklein, 5–9 October 2008 (Pittsburgh), p. 1733–1743.Google Scholar