安定化オーステナイト鋼の長時間加熱による組織の変化について

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書誌事項

タイトル別名
  • Phase Changes of Stabilized Austenite Steel Prolongedly Heated at 650°C
  • アンテイカ オーステナイト コウ ノ チョウジカン カネツ ニ ヨル ソシキ ノ ヘンカ ニ ツイテ
  • Phase Changes of Stabilized Austenite Steel Prolongedly Heated at 650°C

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抄録

It is well known that stainless steel is embrittled by prolonged heating at high temperature. In this study the stable austenite range of nickel and chromium content for embrittlement and phase changes was investigated. Phase changes of austenitic stainless steel is often affected by its preliminary heat-treatment, so that two kinds of heat-treatment were adopted for this study, that is, they were fully solution-treated (1,300°C×1 hr) and precipitation treated (1,300°C×1 hr & 900°C×24 hrs). Phase changes were observed with optical and electron microscopes and by X-ray diffraction method. The typical phases of steels prolongedly heated for 1,000 hrs at 650°C are shown here. The boundary of σ-phase which are never observed in short time heating, appeared after prolonged heating in austenite range changes in some cases by preliminary heat-treatment. As the carbides precipitated in precipitation-treatment are quite stable, so no remarkable phase changes were observed in the specimen of fully austenitic steel prolongedly heated. The most stable range is limited to the range lower than 16% of chromium and the range higher than 12% of nickel.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 26 (8), 513-518, 1962

    公益社団法人 日本金属学会

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