マルエージング鋼のおくれ破壊と析出挙動

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タイトル別名
  • Delayed Failure and Precipitation Behaviors in Maraging Steels
  • マルエージング コウ ノ オクレ ハカイ ト セキシュツ キョドウ

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The relationship between delayed failure occurring in air environment and precipitation behaviors was studied on maraging steels by sustained load test and electrical resistivity measurement.<BR>The formation of low temperature precipitates associated with the presence of titanium was found to have a close relation to the delayed failure occurring on cobalt-free maraging steels containing titanium as a main hardening element.<BR>In case of 18%Ni maraging steels, the delayed failure in air environment was scarcely affected by the precipitation of Mo rich low temperature precipitates which played an important role in the hardening at low temperature aging, but the delayed failure began to be markedly revealed depending on the titanium content, when titanium was added in the 18%Ni maraging steels.<BR>It was estimated from the activation energies that the delayed failure of 18%Ni maraging steels was also significantly affected by the formation of the low temperature precipitates relevant to titanium.<BR>Since it is assumed that the delayed failure is controlled by interaction between dislocation motion cutting the coherent precipitates and hydrogen introduced by dissociation of water adsorbed on the steel surface, the reason why the delayed failure does not occur by the formation of Mo low temperature precipitates only would be that Mo rich low temperature precipitates do not promote the dissociation of water adsorbed on the steel surface unlike the low temperature precipitates relevant to titanium.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 50 (8), 695-700, 1986

    公益社団法人 日本金属学会

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