フェライト系ステンレス鋼中のCu粗大化挙動に及ぼすCr添加効果

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タイトル別名
  • Effect of Chromium Addition on the Coarsening of Cu-particle in Ferritic Stainless Steels
  • フェライトケイ ステンレスコウ チュウ ノ Cu ソダイカ キョドウ ニ オヨボス Cr テンカ コウカ

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<p>Coarsening of Cu-particles in 11.4%Cr-1.48%Cu (11Cr steel) and 23.7%Cr-1.48%Cu (24Cr steel) ferritic stainless steels were investigated mainly using transmission electron microscopy and energy dispersive X-ray spectrometry. The samples were solution-treated at 1250°C and then isothermally aged at 800°C for up to 604.8 ks. Precipitation hardening in steels occurred due to precipitation of Cu-particles during aging. Decrease of hardness of 24Cr steel associated with coarsening of Cu-particles occurred slower than that of 11Cr steel during aging. The normalized standard deviation of the size distribution of Cu-particles increased and reached saturation at a certain value during aging. The kinetic analysis for coarsening of Cu-particles showed that the interfacial energy of Cu-particles/matrix of 24Cr steel was lower than that of 11Cr steel, while diffusion coefficient of the steels did not depend on chromium concentration. The segregation of chromium formed at the interface of Cu-particles/matrix may decrease interfacial energy of Cu-particles resulting in retardation of coarsening of Cu particles.</p>

収録刊行物

  • 鉄と鋼

    鉄と鋼 104 (7), 385-392, 2018

    一般社団法人 日本鉄鋼協会

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