Surface Hardening of Some Cast Irons with Inserted Hard Alloy Particles

概要

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In this paper, two experiments for locally hard facing of cast iron and cast steel will be presented. In the case of locally hard faced spheroidal graphite cast iron with hard alloy briquettes, the inserted layer as formed with penetration of the molten cast iron among tungsten carbide (henceforth, it is described as WC) particles in the hard alloy briquette. The base metal of inserted layer showed a microstructure of gray cast iron due to a hindrance to spheroidalization caused by a reaction the molten cast iron to the elements of W and Co in the hard alloy. The hardness of mother spheroidal graphite cast iron was about Vickers hardness (henceforth, it is described as HV) 200 while the hardness of the inserted layer ranged from HV600 to HV1600. In the case of locally hard faced cast steel, the inserted layer was also formed with similar process to that of the spheroidal graphite cast iron, while intermediate phases with very hard complex carbide were formed at the bonding region between the inserted layer and the base metal. The hardness of mother cast steel was about HV300, while the hardness of the inserted layer ranged from HV800 to HV1400. Especially, the intermediate layer with complex carbide showed the highest hardness of HV1800. Therefore, the inserted methods with hard alloy particles are considered to be a very effective one for locally hard facing of cast iron and cast steel.
秋田大学の論文