消失模型鋳造法を用いた球状黒鉛鋳鉄による超硬合金粒子層の鋳ぐるみ

概要

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Spheroidal graphite cast iron was locally hard-faced with inserted hard alloy powder by an evaporative pattern casting process. The vertical cross-section of the inserted layer was examined on the microstructure with EPMA and the hardness with a Vickers hardness tester. It was confirmed that an inserted layer of about 3 mm in thickness could be formed without any defects at the interface of the spheroidal graphite cast iron. The inserted layer was formed with the penetration of the molten cast iron among WC particles in the hard alloy coating. The matrix metal of inserted layer showed a gray cast iron microstructure due to the hindrance to spheroidization caused by the reaction of the molten cast iron with the W and Co elements in the hard alloy. The hardness of spheroidal graphite cast iron was about HV200, while the inserted layer exhibited a hardness of HV600 to 1400. The present method using the evaporative pattern casting is therfore considered to be very effective for selective hard facing of spheroidal graphite cast iron.
Japan Foundry Engineering Societyの論文