鋼に於ける炭化物の球状化に就いて (III) : 炭化物の球状化の方法と球状化状態の比較

概要

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Using Swedish carbon steels containing 0.5, 0.9, 1.3% C and Ni- and Cr-steels, spheroidizing of carbide was studied by means of the following four kinds of heat treatment, that is, quenching-and-tempering, slow cooling, repeated heating-and-cooling and isothermal transformation. From hardness of the spheroidized specimens obtained by thus four heat-treatments, the procadures of spheroidizing were compared, and the following facts were ascertained : a). By the quench-and-temper method, the spheroidizing of carbide most slowly proceeded, but the sphericles were finely and uniformly distributed. b). In hypo-eutectoid steels, the spheroidizing most rapidly proceeded by the repeated heating and cooling method. But after several repeat no more spheroidizing proceeded. c). By slow cooling method, spheroidizing rapidly proceeded, but the pearlite structure came out easily unless the rigorous heating temperature was taken. d). By the isothermal transformation method, the process of spheroidizing is comparatibly slow but the uniformly distributed structure was obtained.
社団法人日本鉄鋼協会の論文