カルシウム脱酸快削鋼中に認められる非金属介在物の存在形態と被削性について

概要

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Oxide inclusions in Ca-Si deoxydized steel were changed as ; A_2(Silicate) → B_2(discontinious silicate) → C(globular oxide) ↓ {Al addition → B(clustered Alumina) + C(globular oxide) (0.35∿0.8kg/t)} depending on the oxygen content before deoxydation process. From the X-ray microprobe analysis, it was found that A_2 type inclusion had more then 55% SiO_2, B_2 type inclusion had 45∿55% SiO_2, and C type inclusion had up to 40% SiO_2. Drillability and high speed tool life were improved by sulfur addition. Effects of oxide inclusion on the carbide tool life were examined. Crater wear of carbide tool were improved by A_2 type oxide. When oxide inclusion changed to A_2→B_2→C→B type, frank wear of carbide tool with high cutting speed were improved in the order.
社団法人日本鉄鋼協会の論文
1971-11-01