高炭素高速度鋼系合金の凝固組織および凝固過程に及ぼすCuの影響

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  • Effect of Cu on Solidification Microstructure and Solidification Process in High Carbon High Speed Steel Type Cast Alloy

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<p>Effect of copper on solidification microstructure and solidification process were investigated for high carbon high speed steel type alloys (Fe-2.0%C-5%Cr-5%Mo-5%V-0~7.5%Cu in mass%). The microstructure of all as-cast specimens with different copper content is dendrite consisting mainly of primary γ, MC-γ eutectic and M2C-γ eutectic. In the copper-free specimen, the shape of dendrite is granular (or equiaxed), while in the copper added specimens, it is columnar, and the columnarization trend become more pronounced with increasing the amount of copper content. Furthermore, the secondary dendrite arm spacing decreased with increasing amount of copper content. The volume fraction of primary γ dendrite gradually decrease and MC-γ eutectic gradually increase with increasing of the amount of copper content. While the volume fraction of M2C-γ eutectic is approximately constant regardless of the amount of copper content. The concentrations of chromium, molybdenum and vanadium within microstructure were approximately constant regardless of the amount of copper content in any microstructures. While the concentration of copper within microstructure was higher in order of dendrite, MC-γ eutectic and M2C-γ eutectic compared with any copper content, and its order corresponds to the solidification prosses. These results suggest that copper tends to remain in the solid phase (that is dendrite) rather than redistribute to the liquid phase during solidification.</p>

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  • 鉄と鋼

    鉄と鋼 110 (7), 522-531, 2024-05-01

    一般社団法人 日本鉄鋼協会

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