13 Cr-4 Ni鋳鋼のオーステナイト域等温保持による脆化に及ぼすP量の影響

概要

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Carbide-induced brittleness causes the decrease in notch toughness which often occurs in 13Cr-4Ni steel castings when heated or cooled slowly at about 650℃. The influence of P content on this embrittlement was studied, since the low P content could be obtained in high chromium steels by the advanced refining process. Impact notch toughness was deteriorated when the 13Cr-4Ni steel castings were isothermally held at 650℃ in austenite range, and this behavior was remarkable for high P materials. Toughness deterioration was related to intergranular fracture and carbide precipitation at prior austenite grain boundary, and also this tendency was increased with higher P contents. P element was presumed to facilitate the nucleation sites of intergranular carbide, and to promote the carbide precipitation reaction and then grain boundary brittleness.
社団法人日本鉄鋼協会の論文
1988-09-01