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

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

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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Category:Materials Science, Multidisciplinary

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