鋼の結晶粒度測定方法(學振 19 小委第 6 號)

概要

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The method recommended by the Sectional Committee consists of the following processes : (1) Revealing the grain structure of steel. Carburizing at 925℃ for 6 hrs. (in accordance with McQuaid-Ehn's method) is adopted as standard. If necessary, "gradient-quench method" (in accordance with Vilella-Bain method) and "double-quench method" (in accordance with Tomikawa's method) may be also employed. (2) Determination of the grain size. Grain structure thus revealed ahould be examined microscopically at the magnification of 100 in diameter and a grain-size-index-number derermined which corresponds to the strictly prepared Grain Size Chart. The Grain Size Chart consists of the 8 photomicrographs of hyper-eutectoid structure of steel, each denoting the index-numbers 1 to 8 progressively. The index-numbers are arranged to conform to the geometrical ratios, in which for instance No.1 signifies the existence of 16 grains per mm^2 actually, No.2 32 grains/mm^2, No.3 64 grains/mm^2 and so on. The present method is the outcome of about one and half year's earnest efforts in which a number of specialists have cooperated. The author certainly believes in that the presentmethod will be useful for the study of steel-making and further treatments of steel so far as the steel quality concerns.
社団法人日本鉄鋼協会の論文
1941-03-25