Browse > Article
http://dx.doi.org/10.12656/jksht.2010.23.6.301

A Study on Mechanical Properties and Microstructure of Local-Hardening Heat-Treated Automotive Panel  

Lee, Jae Ho (School of Mechanical and Automotive Engineering, Catholic University of Daegu)
Jeong, Woo Chang (School of Mechanical and Automotive Engineering, Catholic University of Daegu)
Publication Information
Journal of the Korean Society for Heat Treatment / v.23, no.6, 2010 , pp. 301-308 More about this Journal
Abstract
A steel with chemical composition, 0.22% C, 0.25% Si, 1.26% Mn, 0.22% Cr, 0.04% Ti, 0.0042% B, and a microstructure of ferrite and spheroidized cementite has been press-formed to automotive center pillar followed by local-hardening heat-treatment. Hardness, tensile properties, fractography, microstructure and surface roughness of local-hardening heat-treated automotive center pillar have been examined. The directly heated and quenched area had fully martensitic structure with Vickers hardenss in the range of 500 to 510. The heat affected area close to the directly heated area showed dual-phase structure of ferrite and martensite. The width of the heat-treated and heat-affected areas after the local-hardening heat treatment was ranging from 32 mm to 50 mm. The surface of the local-hardening heat-treated center pillar revealed some temper color as a consequence of the oxidation during the heat treatment, but the surface roughness was not affected by the local-hardening heat treatment.
Keywords
Automotive body panel; High strength steel; Induction heating; Local-hardening heat treatment; Mechanical properties; Microstructure;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 M. Shibata and M. Oonishi : SAE No 980550.
2 M. Shibata and K. Makino : Materials Japan, 37 (1998) 525.   DOI
3 D. H. Lee, C. S. Yoon and J . D. Lim : J. of the Kor. Soc. for Heat Treatment. 17 (2004) 73.
4 W. C. Jeong : The Korean Institute of Metals and Materials 2005 Spring Conference, 25.
5 K. Tamada, A. Sato, and K. Nakagawa : 19th IDDRG (1996) 47.
6 J. Suh, J. H. Lee, J. O. Kim, S. J. Oh, H. Lee, and C. S. Shin : KIM & M Report, 4 (2001) 21.
7 S. H. Park : POSCO Technical Research Report, (1995) 31.
8 W. C. Jeong : J. of the Kor. Soc. for Heat Treatment, 19 (2006) 150.
9 W. C. Jeong : J. of the Kor. Soc. for Heat Treatment, 19 (2006) 270.
10 G. Krauss : Processing, Structure, and Performance of Steels, ASM International, Materials Park, Ohio, (2006) 77.
11 S. Satoh, S Yamazaki : Trans. ISIJ, 21 (1981) 772.   DOI   ScienceOn