Browse > Article
http://dx.doi.org/10.12656/jksht.2022.35.2.66

Hardness Distribution and Dimensional Change after Partial- Hardened Hot Stamping of Automotive Body Part  

Jeong, Woo Chang (School of Mechanical and Automotive Engineering, Daegu Catholic University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.35, no.2, 2022 , pp. 66-73 More about this Journal
Abstract
Partial-hardened hot stamping has been well known to be very effective to absorb more energy in automotive lateral crash. Hardness distribution and dimensional change after partial-hardened hot stamping have been studied to find out effect of thermal deformation of the heated hot stamping die on dimensional accuracy of automotive center pillar. Soft zone of commercial center pillar showed 275~345 in Vickers hardness, indicating bigger non-uniformity which resulted from thermal deformation of heated die. Dimensional changes in soft zone of the commercial center pillar measured by three dimensional scanner were much bigger than that in hard zone. It has been found that hot stamping die compensation considering thermal deformation in soft zone causes a significant decrease in hardness deviation in the soft zone, corresponding to 20 percent of commercial center pillar and subsequently leads to much higher dimensional accuracy.
Keywords
Automotive body part; Partial-hardened hot stamping; Al-Si coating; Boron steel; Dimensional change;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 GM Material Specification 14400.
2 Y. Chang, Z. h. Meng, L. Ying, X. d. Li, N. Ma, and P. Hu : J. Iron. Steel. Res. Int., 18 (2011) 59.
3 M. G. Lee, S. J. Kim, H. N. Han, and W. C. Jeong : Int. J. Mech. Sci., 51 (2009) 888.   DOI
4 J. Jeong, S. C. Park, G. Y. Shin, C. W. Lee, T. J. Kim, and M. S. Choi : Korean J. Met. Mater., 56 (2018) 787.   DOI
5 A. Turetta, S. Bruschi, and A. Ghiotti : J. Mater. Process. Technol., 177 (2006) 396.   DOI
6 H. Karbasian and A. E. Tekkaya : J. Mater. Process. Technol., 210 (2010) 2103.   DOI
7 Hao Zhao, Xiuli Hu, Junjia Cui, and Zhongwen Xing : Met. Mater. Int., 25 (2019) 381.   DOI
8 K. Y. Kwon, N. H. Kim, and C. G. Kang : Open J. Adv. Mater. Res., 264 (2011) 241.
9 D. Y. Lee : 24th Iron and Steel Technology Symposium, Kor. Inst. Metal. and Mater., Jeju, Korea (2021).
10 L. Gehringhoff and H. Knaup : B-Column for Motor Vehicle, United States Patent, US6524404 B2 (2003).
11 K. B. Kim, Y. I. Jung, and T. J. Kim : Trans. Mater. Processing, 24 (2015) 354.   DOI
12 A. Ghiotti, D. Pellegrini, and S. Bruschi : Feasibility of Producing Tailored Microstructures in Hot Stamped Sheet Components, IDDRG (2009) 941.
13 F. J. Lenze, J. Banik, and S. Sikora : Applications of Hot Formed Parts for Body in White, IDDRG (2008) 511.
14 Nippon Steel Brochure on Special Steel Sheets and Coils (2020).
15 W. C. Jeong : J. Kor. Soc. Heat Treatment, 34 (2021) 107.   DOI
16 D. W. Fan, H. S. Kim, J. -K. Oh, K. -G. Chin, and B. C. Decooman : ISIJ International, 50 (2010) 561.   DOI
17 M. K. Ji H. Son, J. Oh, S. Kim, K. Kim, and T. Jun : Kor. J. Metals and Mater., 58 (2020) 573.   DOI
18 P. Matysik, S. Jozwiak, and T. Czujko : Materials, 8 (2015) 914.   DOI