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Impact failure of hot forging dies occurs frequently from surface cracks due to mechanical or thermal fatigue. However, useful information regarding failure analysis of hot forging dies is scarce because few data exist on the fracture behavior and fractography of hot forging die steels.
In this paper, what is mainly described is dynamic fracture toughness, low cycle fatigue behavior, and fracture surface appearances of hot forging die steels. A couple of quantitative analyzed examples of fracture toughness and temperature by use of stretched zone width measurement for hot forging die failure are described.
forging dies, dynamic fracture toughness, low-cycle fatigue, stretched zone, fractography, failure analysis
Associate chief research engineer, Hiroshima Technical Institute, Mitsubishi Heavy Industries, Hiroshima,
Assistant manager, Tokyo Motor Vehicle Works, Mitsubishi Motors Corp., Kawasaki,