黒心可鍛鑄鐵の熱特性に就て

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概要

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• If the black-heart malleable cast iron completely annealed is thermally treated as in the case of galvanizing, the casting becomes very brittle at the room temperature ; its fracture shows white and metallic luster. Leslie H. Marshall studied this problem and later published it. The writer, also, has studied it about at the same time. Marshall's investigation consists of only impact test on the specimens of black-heart malleable cast iron quenched at various high temperatures. He found that if the casting is cooled in water at temperatures ranging from 300° to 550°, it causes the casting to become brittle and, also, he discovered that it is favorable method to cool quickly the casting from 650° before galvanizing it in order to prevent from becoming brittle. In the course of the writer's research, he got the same result identical with Marshall's, but continued on further study until he found an ideal annealing method to produce superior malleable cast iron from white iron castings. This malleable iron castings produced by the writer's method never cause the brittleness from the heattreatment as in the case of galvanizing although any heattreatment at 650° is not given as recommended by Marshall. The writer afterward did the impact testing at various temperatures on the specimens treated and untreated thermally, did, also, the microscopic test on the same specimens, and took measure of an electric property during the period of heating and cooling. From these facts the theory for the emprittlement of black-heart malleable cast iron was built up.

• 社団法人日本鉄鋼協会の論文
• 1932-03-25

著者

• 菊田 多利男

  日立製作所中央研究所

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