白心可鍛鑄鐵の性質に就て

概要

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Some physical properties on white heart malleable cast iron were studied and the following results were obtained. (a) Change of specific gravity in annealing : The specific gravity decreases continuously by decarburization after graphitization had completed. This fact shows that traces of temper carbon remain as cavities, hence the decarburized zone of malleable cast iron is not sound as steel. (b) Tensile strength : The tensile strength was discussed in dividing into two parts as graphitized zone and decarburized zone, the former strength wae almost the same with pearlite malleable cast iron, but the latter strength was lower than black heart malleable cast iron in spite of the structure is same silicoferrite as black heart malleable cast iron. (c) Embrittlement : If silicon content increase, there takes place so called embrittlement phenomena as known on black heart malleable cast iron, but when silicon content decreased, this phenomena was not observed. (d) Growth during repeated heatings and coolings : Gray cast iron or black heart malleable cast iron takes place an apparent growth during repeated heatings and coolings, but the white heart malleable cast iron decarburized extensively did not take place the growth notwithstanding some temper carbons are remained in ferrite.
社団法人日本鉄鋼協会の論文
1951-06-25