Sadao Koshiba and Kazuo Tanaka
The effects of subzero treatment on the cutting durabilities and the deflective strength of four kinds of high-speed steels, namely, low-tungsten high-speed steel, low-tungsten-cobalt high-speed steel, molybden-tungsten high-speed steel and 18-4-1 steel were investigated. It was found that the cutting durability of subzero-treated specimen after oil-quenching was almost the same as compared with that of a specimen which was repeatedly tempered after oil quenching,and that the deflective strength of the former was equal to or was smaller than that of the latter. From the results of these investigation, it was concluded that the subzero-treatment on cutting-durability of high-speed steel due to lathe-cutting was not very effective.
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