Observation of Multiscale Structure for a Ferritic Heat-Resisting Steel (12Cr-2W)

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  • Hayakawa Masao
    Materials Information Technology Station, National Institute for Materials Science (MITS/NIMS)
  • Yamaguchi Koji
    Materials Information Technology Station, National Institute for Materials Science (MITS/NIMS)
  • Kimura Megumi
    Materials Information Technology Station, National Institute for Materials Science (MITS/NIMS)
  • Kobayashi Kazuo
    Materials Information Technology Station, National Institute for Materials Science (MITS/NIMS)

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Other Title
  • フェライト系耐熱鋼（１２Ｃｒ‐２Ｗ）のマルチスケール構造の組織解析
  • フェライト系耐熱鋼(12Cr-2W)のマルチスケール構造の組織解析
  • フェライトケイ タイネツ コウ 12Cr 2W ノ マルチスケール コウゾウ ノ ソシキ カイセキ

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Abstract

Microstructural analyses by FE-SEM and TEM were performed for a ferritic heat-resisting steel that contained 12 mass% chromium and 2 mass% tungsten to characterize a multiscale structure consisting of prior austenite grains, packets, blocks and subgrains. The size distributions of the blocks, precipitates and subgrains were quantitatively evaluated before and after a creep-fatigue testing, respectively, to relate the creep-fatigue property. As the results, it was shown that the occupancy of precipitates on prior austenite grain boundaries increased markedly and subgrains became coarse during the creep-fatigue testing, while the size of blocks did not change. It is suggested that the growth of the grain boundary precipitates and subgrains plays an important role of the creep-fatigue fracture mechanism.

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