Investigation of Surface Hardness of Steels in Cyanide Salt Bath Heat Treatment Process
نویسنده
چکیده
Carbonitriding of four types of steels, namely, low carbon steel (LCS), medium carbon steel (MCS), low alloy steel (LAS) and high alloy steel (HAS) was achieved using cyanide salt bath heat treatment process. The steels, after preheating, were heated in a diesel fired salt bath heat treatment furnace and then quickly quenched in different media including air, oil and brine. The heat treatment processes were performed at different temperatures ranging from 790C to 920C. The heat treatment time was varied from 30minutes to 120 minutes at an interval of 30 minutes so as to investigate its effect on the surface hardness of LCS. The surface hardness of all the heat treated steels samples were measured using an Indentec Rockwell hardness tester. The result revealed that the surface hardness of the heat treated steels is related to the heat treatment temperature and the quenching medium used. Also, the heat treatment time of LCS in salt bath furnace has a significant effect on the surface hardness of the steel.
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