オーステナイト系耐熱鋼の時効硬化挙動に及ぼすPの影響

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書誌事項

タイトル別名
  • Effect of Phosphorus on Age-hardening Behavior of Austenitic Heat Resisting Steels
  • オーステナイトケイ タイネツコウ ノ ジコウ コウカ キョドウ ニ オヨボス P ノ エイキョウ

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説明

The age-hardening behavior at around 750°C and microstructure analysis of experimentally prepared heat resisting steels based on SUH38 containing phosphorus in the range of 0 to 0.3 mass% have been investigated, in order to identify the formation mechanism of the homogeneous distribution of fine carbide within grain interiors (MDP: matrix dot precipitation) by the addition of phosphorus. The steel does not show age-hardening until the phosphorus content in the steel beyond 0.15 mass%, and the hardness increases from 200 HV to 350 HV with increasing phosphorus content. The high age-hardening was caused by the high density of fine M23C6 carbides with cube on cube orientation relationship between γ and M23C6. Phosphorus was found to exist in γ-matrix as substitutional manner after solution and aging treatments. The fine carbide formation mechanisms within grain interiors are attributed to an interaction between phosphorus and carbon in solution.

収録刊行物

  • 鉄と鋼

    鉄と鋼 102 (7), 389-395, 2016

    一般社団法人 日本鉄鋼協会

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