日本金属学会誌
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
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オーステナイト系耐熱鋳鋼の耐熱衝撃性に及ぼすNbの影響
奥山 哲也東園 拓海ゴ フィン キン ルアン工藤 昌輝
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2019 年 83 巻 12 号 p. 474-478

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The effect of Nb on microstructure and thermal-shock resistance was investigated for as cast and annealed JIS SCH21 steels. Primary NbC carbide were crystallized together with M23C6 at grain boundary in as cast steel. Decomposition of primary M23C6 was detected, while NbC was also hardly decomposed when annealed at elevated temperature. It was found that chromium carbides had low thermal stability but primary NbC carbides played a role in preventing propagation of micro-cracks and restraining shape deformation under condition both heating and quenching. As a result, thermal-shock resistance was improved in the Nb-added steel.

Fig. 12 Partitioning of alloying elements analyzed by STEM-EDS for micro-crack in Nb steel occurred when thermal shocked at 1223 K for 300 cycles. Fullsize Image
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