| Title |
Strength Change in Ultra Low Carbon Steel due to Carburizing Heat Treatment for Hot Press Forming |
| DOI |
https://doi.org/10.3365/KJMM.2012.50.6.433 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
HPF; hot press forming; strength; stress; ultra Low carbon steel; carburizing heat treatment |
| Abstract |
Strength change in ultra low carbon steel carburized at 880℃ and 930℃ for 10, 30, 60 and 120 minutes was investigated. The results were analyzed by a tensile test, chemical composition analysis, optical microscopy and scanning electron microscopy. Stress in the 0.5% strain specimen in the tensile test increased as the time treated at 880℃ and 930℃ increased, because the carbon diffusion layer and the martensite of the specimen increased with increasing treatment time. Martensite was found in the ferrite region in the specimen treated at 880℃, which is attributed to grain boundary diffusion. |