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Microstructure characterization of oxide dispersion strengthened steels containing metallic chromium inclusions after high-temperature thermal aging

金属Cr介在物を含む酸化物分散強化型鋼の高温熱時効後組織

大塚 智史; 矢野 康英; 丹野 敬嗣; 皆藤 威二; 田中 健哉

Otsuka, Satoshi; Yano, Yasuhide; Tanno, Takashi; Kaito, Takeji; Tanaka, Kenya

ODS鋼被覆管のBOR-60照射試験で生じた特異な組織変化(不定形で粗大な析出物の形成)の再現試験として、金属Cr介在物を含有する9Cr-ODS鋼の高温長時間熱時効試験、及びその後の組織調査を実施した。750$$^{circ}$$C, 8000時間の時効により、金属Cr介在物周辺に不定形で粗大な析出物が形成し、特異な組織変化を再現することができた。エネルギー分散型X線分析装置(EDX)及び電子線後方散乱回折装置(EBSP)を用いた分析により、不定形粗大析出物はM23C6と同定した。

Microstructure characterizations of 9Cr-oxide dispersion strengthened (ODS) steels were carried out after high-temperature thermal aging to reproduce the anomalous microstructure change that occurred in the BOR-60 irradiation test-formation of abnormally coarse and irregular precipitates a few tens of micrometers in size. In the 9Cr-ODS steel containing metallic Cr inclusions, coarse and irregular precipitates were formed nearby metallic Cr inclusions after the 750$$^{circ}$$C thermal aging for 8,000h. Based on the analyses using energy dispersive X-ray spectrometry (EDX) and electron backscattered pattern (EBSP), coarse and irregular precipitates were identified as M23C6.

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パーセンタイル:67.03

分野:Materials Science, Multidisciplinary

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