Browse > Article
http://dx.doi.org/10.3795/KSME-A.2012.36.3.319

A Study on the Properties of Laser-Welded Boron Steel for Hot Stamping According to the Heat-Treatment Conditions  

Hwang, Seok-Hwan (UR Interdisciplinary Program of Mechanical Engineering, Pukyong Nati'l Univ.)
Nam, Ki-Woo (Dept. of Materials Science and Engineering, Pukyong Nati'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.36, no.3, 2012 , pp. 319-324 More about this Journal
Abstract
The hot-stamping technique is a forming method for manufacturing high-strength parts, in which the part is cooled rapidly after press forming above the austenite transformation temperature. Boron steel, which contains a very small amount of boron, is one of the materials used for hot stamping. The purpose of this study is to investigate the microstructure and mechanical properties according to the heat-treatment conditions. Die-quenching from various temperatures was conducted for different elapsed heat-treatment times. Laser-welded boron steel after quenching has a tensile strength of 1454 MPa and an elongation of 6 %. It has 94 % of the tensile strength of the base metal (1522 MPa). These properties can provide practical information for the use of boron steels for hot stamping.
Keywords
Boron Steel; Hot-Stamping; TWB; YAG Laser Welding; Die Quenching;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Hovanski, Y., Santella, M. L. and Grant, G. J., 2007, "Friction Stir Spot Welding Of Hot-Stamped Boron Steel," Scripta Materialia, Vol. 57, pp. 873-876.   DOI   ScienceOn
2 Altan, T., 2006, "Hot-Stamping Boron-Alloyed Steels for Automotive Prats, Part I : Process Methods and Uses," Stamping Journal, pp. 40-41.
3 Engels, H., Schalmin, O. and Muller-Bollenhagen, C., 2006, "Controlling and Monitoring of the Hot-Stamping Process of Boron-Alloyed Heat-Treated Steels," The International Conference New Development in Sheet Metal Forming Technology, pp.135-150.
4 Lee, H. W., Kim, Y. H. and Lee, S. H., 2007, "Effect of Boron Contents on Weldability in High Strength Steel," Journal of Mechanical Science and Technology 21, pp. 772-778.
5 Lee, M. K., Kim, S. J. and Jeong, W. C., 2008, "Technology of Press Hardening for Manufacturing Ultra-high Strength Automobile Parts" Machine and Materials, pp. 83-86.
6 Tröster, T. and Rostek, W., 2004, "Advanced Hot Forming," in Proceedings from the International Conference "New Development in Sheet Metal Forming Technology," Stuttgart, Germany, pp. 49-63.
7 Kolleck, R., et al, 2004, "Hot Forming and Cold Forming Two Complementary Processes for Lightweight Auto Bodies," in proceedings from the International Conference "New Development in Sheet Metal Forming Technology," Stuttgart, Germany, pp. 235-244.