冷間ダイス鋼の熱処理変寸の異方性に及ぼす晶出炭化物の影響

概要

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The influence of coarse carbide volume on anisotropy of dimensional change at heat treatment of cold working die steels has been investigated. The influence of carbide shape on anisotropy has been estimated by FEM analysis using very simplified models that contained carbide. Dimensional change increases with increasing carbon content of martensite. Anisotropy isnt affected by carbon content and phase transformation in this experiment. On the other hand, volume of large primary carbides affects anisotropy ; a parallel direction in forging direction is longer than vertical direction. By FEM analysis, Anisotropy is generated including the carbide. The length of test piece increases with increasing aspect ratio of carbide. The result of anisotropy by FEM analysis at a large aspect ratio is same as the experiment result.