Effect of Vacuum Heat Treatment and Salt Bath Heat Treatment Conditions on Mechanical Properties of Hot Work Die Steel

열간 금형강의 기계적 성질에 미치는 진공열처리와 염욕열처리 조건의 영향

Salt bath heat treatment is usually used but recently vacuum heat treatment is increased for the heat treatment of hot work die steels. The differences in two heat treatment processes were compared by testing the mechanical properties of heat treated products. With two different features of processes, mechanical properties such as hardness, tensile strength and impact strength of products show very different results. In this study salt bath heat treated products showed higher tensile strength and impact strength than vacuum heat treated products but hardness was not much different. These lower mechanical properties of vacuum heat treated products are due to differences in heating and quenching process.