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김대욱,김문진,임병수 기계기술연구소 1999 성균관대학교 논문집 기계기술편 Vol.1 No.1
Mechanical properties of vacuum carburized SCM415 were evaluated after various heat treatments including direct quenching, single reheat quenching and sub-zero treatment. Comparing the fatigue and wear characteristics of carburized specimens to those of hot annealed or reheat quenched specimens, the wear resistant proerty as well as bending fatigue limits of vacuum carburized steels were substantially superior to other heat treated steels. Test results indicated that the carburized and reheat treated specimens have higher fatigue limits than the carburized and direct-quenched specimens and the specimens followed by sub-zero treatment. The optimum amount of retained autenite exists for the maximum fatigue strength XRD, this value was found to be approximately 5%. The wear volumes of sub-zero treated specimens with higher surface hardness show slightly lower values than those of non sub-zero treated specimens with higher surface hardness show slightly lower values than those of non sub-zero treated speciments. This is attributed to the reduction of retained austenite amount of the surface and an increase of surface hardness by the sub-zero treatment effect.