15Cr-26Ni-1.25Mo 耐熱鋼の長時間加熱脆化に及ぼす Ti および C 量の影響

概要

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The object of this study is to characterize the effect of alloying elements on the toughness of 15Cr-26Ni-1.25Mo type alloy steels (A286) aged at 650℃. The results obtained are summerized as follows. (1) The Charpy absorbed energy of 15Cr-26Ni-1.25Mo type alloy steels aged at 650℃ was decreased with increasing C content. This fact suggestes that aging embrittlement closely depended on C content. (2) Precipitates were found on the grain-boundaries of the alloys aged at 650℃ for 1500h. Microscopic examination indicated that these precipitates grew as aging time increased. Auger electron spectroscopy showed that titanium carbides were included in the precipitates. (3) Decreases of C to 0.03wt% and Ti to 1.65wt% were beneficial in keeping good Charpy absorbed energy the value of 35 to 55 N-m in the specimens aged for 6000h at 650℃, without reduction of creep rupture strength at 650℃.
社団法人日本鉄鋼協会の論文
1985-01-01