鋼の階段燒入に關する研究(第 1 報その 2)

概要

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The simplest stepped quenching is constructed on the following way : water quenching-lifting in air or water quenching-lifting in air-second water quenching. In case where the simplest stepped quenching was on carbon steel samples of cylindrical form, the change of the internal temperature within the sample was obtained both from the calculation of heat conductivity and from the experiment, and the value of constants in the calculation was determined so to coincide in both ways. Since the calculation formulae and constants thus obtained was applied to the stepped quenching of specimens of different dimensions and the result coincident with the experimental value obtained, it was presumed that the thermal change within the steel shape might be worked out only by calculation without actual measurement when heavy sections was quenched in the stepped method. Moreover, the change of structural and hardness distribution in the section of specimens was experimentally studied and the relationship between both distributions was obtained, where the time interval of each stage of the stepped quenching was varied diversely. Finally, it was shown that special structural and hardness distributions occurred in the stepped quenching of the carbon steel specimen may be rationally explained from the isothermal (cooling) transformation curve.
社団法人日本鉄鋼協会の論文
1944-03-25