Ni-20Cr 合金の高温クリープ特性に及ぼす炭素の効果

概要

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Changes in the creep resistance and dislocation substructure with addition of carbon have been studied in the temperature range between 900-1050℃, by using high purity Ni-20Cr alloys containing carbon up to 0.032wt%. The creep resistance of the alloy increased at the temperatures less than 1000℃, with increasing of carbon content dissolved in γ-matrix. Such a strengthening effect was presumed to be caused by solid solution of carbon, and was associated with increase in dislocation density within subgrains. At 1050℃, the formation of subgrains or the dynamic recrystallization took place in the alloy with 0.032wt% carbon and these microstructural changes brought the decrease in the creep resistance of the alloy. The precipitation of carbide (M_7C_3) at the grain boundaries significantly increased the creep resistance, and this phenomenon was very similar to the grain boundary precipitation strengthening effect by α_2-W phase in Ni-Cr-W alloys.
社団法人日本鉄鋼協会の論文
1987-01-01