Microstructure and Grain Boundary Precipitates in 912% Cr Ferritic Heat-resisting Steels

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  • 9~12% Crフェライト系耐熱鋼の微細構造と粒界析出物
  • 9 12パーセント Cr フェライトケイ タイネツ コウ ノ ビサイ コウゾウ ト リュウカイ セキシュツブツ

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Abstract

Observation of electropolished surface by FE-SEM revealed a multiscale structure composed of prior austenitic grains, packets, blocks and precipitates for ferritic heat-resisting steels. After the creep-fatigue tests the microstructure showed little change except for the precipitate's size and density. Drastic changes of dislocation subgrains within the block were observed by TEM. Occupancy of the precipitates on prior austenitic grain boundaries was newly proposed as an index of creep-fatigue damage.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 90 (1), 27-32, 2004

    The Iron and Steel Institute of Japan

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