Fe-15Ni-Co-Mo-Ti 合金のマルテンサイトからの逆変態オーステナイトの細粒化

概要

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The effects of 5Mo, 15Co or 2Ti addition to Fe-15Ni-10Co-5Mo base alloy on grain refinement of reversed austenite subjected to single austenitizing were studied at heating rates between 0.083 and 100℃/s. Grain refinement was promoted by Co or Ti addition and was suppressed by Mo addition. Grain refinement was promoted in the base, (base+15Co) and (base+2Ti) alloys at the lower heating rates, whereas it was suppressed in the (base+5Mo) alloy. Refining processes depended on chemical composition and heating rate, and were classified into the following two groups in terms of the differences in the initial stage of formation of γ grains : (1) after completion of reverse transformation, γ grains were formed due to recrystallization of γ ; and (2) during reverse transformation, γ grains were formed probably by nucleation and growth of diffusionally transformed γ. It was shown that the mechanisms of reverse transformation associated with chemical composition and heating rate played an important role in these refining processes.
社団法人日本鉄鋼協会の論文
1981-08-01