焼入, 常温時効および焼戻による長さの変化と靱さについて : 低 W-Cr 工具鋼 (SKS 2) の低温熱浴焼入 II

概要

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In this article, using cylindrical specimens of a 1.0% C-1.0% Cr-1.4% W tool steel, length changes on hot-bath quenching under certain conditions at temperatures both above and below its Ms point (162℃), subsequent aging at room temperature and tempering were measured. Their intensity of magnetization, hardness and toughness in statical bending test were also measured, being compared with those in the case of oil quenching and tempering. It was found that specimens consisting of tempered martensite, lower bainite and a lot of stabilized retained austenite, obtained by hot-bath quenching below its Ms point, under such conditions of 150℃-24h or 130℃-48h, followed by aging at room temperature for several days and tempering at 180℃, showed little length change as well as possesed much greater toughness with hardness above Rc 63 than those oil-quenched and tempered ordinarily.
社団法人日本鉄鋼協会の論文
1958-12-01