黒心可鍛鋳鉄の衝撃特性におよぼす珪素の影響

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タイトル別名
  • The Effects of Silicon on the Impact Properties of Black-Heart Malleable Cast Iron
  • コクシン カタンチュウテツ ノ ショウゲキ トクセイ ニ オヨボス ケイソ ノ エイキョウ

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抄録

It is well known that as the Si content of black-heart malleable cast iron increases, the so-called galvanizing embrittlement is apt to appear, but all observations of the phenomenon in the past were made only at room temperature. However, it is thought reasonable that the phenomenon should be considered on the basis of the whole figure of impact transition from the view point of low-temperature embrittlement. This experiment was planned from such a stand-point. Three kinds of samples were prepared to contain Si in the range of chemical compositions of commercial black-heart malleable cast iron. They were malleablized, some were heated and held at various temperature of 250∼700°C, and then water-quenched. The impact tests were carried on that samples at temperatures of −196∼+100°C, and impact transition curves were obtained. The results are summarized as follows: (1) According to the increase of Si content, the impact-transition temperature shifts to the side of higher temperature and the tendency of inducing low-temperature embrittlement increases, and the maximum absorbed energy decreases. (2) The transition temperature shifts to the higher side by heat treatment at various temperatures up to 700°C, and the susceptibility to embrittlement is largest when heat treatment is carried out 450°C.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 26 (3), 195-199, 1962

    公益社団法人 日本金属学会

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