Ca処理をした硫化物系快削鋼における介在物の被削性改善機能向上

概要

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Ca treatment on sulfide-containing free machining steel is known as technology to control the sulfide shape. It is also possible to generate the duplex sulfide inclusion which has good tool life improvement effect by adjustment of Ca addition. This duplex inclusion has a core-and-shell construction which consist of (Ca,Mn)S precipitate wrapping CaO·mAl2O3 type oxide as the overlaying layer. A tool life is improved remarkably by duplex inclusion dur to the behavior of generating a calcium-manganese sulfide film on the tool surface. It is, however, necessary to adjust a Ca concentration in shell sulfide and melting point of core oxide in order to demonstrate the greatest function of duplex inclusions. It is essential for it that aCaO of core oxide is controlled to around 0.02 in addition to optimizing aO/aS balance.