발간논문

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Vol.50, No.6, 433 ~ 439, 2012
Title
Strength Change in Ultra Low Carbon Steel due to Carburizing Heat Treatment for Hot Press Forming
강수영 Soo Young Kang
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.
Key Words
HPF, hot press forming, strength, stress, ultra Low carbon steel, carburizing heat treatment
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