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http://dx.doi.org/10.12656/jksht.2013.26.1.7

Effects of Vacuum Heat Treatment and Salt bath Heat Treatment Conditions on Mechanical Properties of High Speed tool Steel  

Kim, Je-Don (Division of Advanced Materials Engineering, Kongju National University)
Kim, Kyung-Sik (Division of Advanced Materials Engineering, Kongju National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.26, no.1, 2013 , pp. 7-13 More about this Journal
Abstract
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 temperature and fast cooling rate. With these 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 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.
Keywords
SKH55; Salt bath heat treatment; Vacuum heat treatment; Hardness; Tensile strength; Impact strength Mar-quenching; Mar-tempering; Nitrogen gas quenching;
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