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금속도 공구강의 기계적 성질에 미치는 진공열처리와 염욕열처리 조건의 영향
김제돈 ( Je Don Kim ),김경식 ( Kyung Sik Kim ) 한국열처리공학회 2013 熱處理工學會誌 Vol.26 No.1
Adstract Vacuum heat treatment(indirect heating method) has long exposure time at high temperature and low quenching rate. Contrarily salt bath heat treatment (direct heating method) has short exposure time at high tem-perature and fast cooling tare. With these different features of processes, mechanical properties such as hard-ness, tensile strength and impact strength of products show very different results. In this study, Salt bath hard-ness was not much different. These lower mechanical properties of vacuum heat treated products but hard-ness was not much different. These lover mechanical properties of vacuum heat treated products are due to dif-ferences in heat process and secondary hardening with high temperature tempering process. Consequently, It indicates that salt bath heat treatment is better way than vacuum heat treatment for product to have high mechanical properties.(Received October 3, 2012; Revised November 20, 2012; Accepted January 13, 2013)
열간 금형강의 기계적 성질에 미치는 진공열처리와 염욕열처리 조건의 영향
김제돈,김경식,박기호,Kim, Je-Don,Kim, Kyung-sik,Park, Ki-Ho 한국금형공학회 2014 한국금형공학회지 Vol.8 No.2
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.