The failure dies of hot forged cast dies made by a new type of cast steel have been analyzed. The failure causes of different failure patterns are discussed.
对新型精铸模具钢制热锻模具的失效进行了分析，并对不同形式下模具的失效原因作了探讨。
The results show that hot-forged cast dies take thermal wear, plastic deformation, thermal fatigue, impact fatigue fracture and brittle fracture as predominant failure patterns.
结果表明，精铸热锻模的主要失效形式为热磨损、塑性变形、热疲劳裂纹、冲击疲劳破断和脆性断裂。
The plasma nitriding process, the service condition, the selection of material and the plasma nitriding processing of the large-scale automobile cast iron dies were reviewed and discussed.
对铸铁的离子渗氮技术进行了综合评述，讨论了大型汽车覆盖件模具服役条件、材料选择和铸铁离子渗氮工艺。
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