6%Siを含む高Mn鋼の低温脆性

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タイトル別名
  • Low Temperature Embrittlement in High Manganese Steels with 6%Silicon
  • 6パーセント Si オ フクム コウ Mn コウ ノ テイオン ゼイセイ

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抄録

The low temperature embrittling behavior in Fe-(17-33)%Mn-6%Si alloys has been investigated by Charpy impact tests and scanning electron microscopy. The embrittlement is attributed to the formation of ε martensite, and the fracture proceeds as follows: (1) Voids are formed at the intersecting points of ε martensite plates. (2) The voids are combined along an ε martensite plate and lead to a platelike microcrack. (3) The microcracks are connected together resulting in fracture. This process is thought to be a sort of brittle fracture, because the matrix near the fractured surface is hardly subject to plastic deformation.<BR>If α′ martensite, however, is formed during deformation, the formation of voids at the intersection of ε-plates is suppressed, resulting in ductile fracture when α′ martensite is ductile. An Fe-17%Mn-6%Si alloy which has (γ+ε) structure below 415 K, for example, keeps high toughness down to the low temperature of about 150 K because of the strain induced transformation to α′ martensite.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 49 (11), 939-944, 1985

    公益社団法人 日本金属学会

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