レーザによってハードアイ化されたダクタイル鋳鉄の衝撃破壊特性

概要

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The surface of the ferritic ductile cast iron was transformed into the hard eye structure by laser treatment, and its impact toughness was investigated. Only surroundings of graphite nodule were reinforced by martensite phase so that this surface structure has the ductility with certain strength without embrittlement by the formation of hard martensitic network. With the controlled laser treatment operation, obtained hard eye structure was more ideal than that with another heating and quenching method. The Charpy impact values of this hard eye material was compared with those of the conventionally laser-treated ductile irons using unnotched specimens. For the iron with remelted surface or with all martensitic matrix one, its impact value is about one half the value for ferritic ductile iron. The hard eye material shows higher Charpy value than those of conventionally treated irons and has the toughness adjacent to the value for ferritic iron.
日本鋳造工学会の論文