영문초록
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)
분야
16701453.pdf 
