Ca 快削鋼の介在物形態と被削性

概要

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The relationships between machinability based on tool life and oxide inclusion morphology of calcium deoxidized Cr-Mo case hardening steels and carbon structural steels, melted by 2〓 arc furnace, were investigated. The results are as follows : 1) In the case that the oxide inclusions in the calcium bearing free machining steels are A_2 type which are plastically deformed by hot rolling, the prolongation of tool life is obtained not only for cemented carbide tool but also high speed steel tool. 2) The oxide inclusions contributing to the formation of "Belag" on the cemented carbide tool face are those which soften or melt down at certain cutting temperature on the tool-chip contact surface. 3) Sulfur addition (0.07%S) to the calcium bearing free machining steels is effective for the chip breakability, but the effect is not clear for the tool life.
社団法人日本鉄鋼協会の論文
1971-11-01