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本文试验研究了GCr15钢冷模具原始组织经高温固溶碳化物细化予处理,再通过控制马氏体形态的低温短时加热淬火和奥氏体晶粒超细化的四次循环快速加热淬火;以及球化加常规工艺淬火的旋转弯曲疲劳性能和断口形貌分析。从而寻求提高冷模具使用寿命的最佳热处理工艺。试验表明,在冷模具的热处理生产中,首先应根据模具的服役条件和损坏形式来确定相应的失效抗力指标,然后选择合理的热处理工艺,这样才能进一步挖掘材料潜力,延长使用寿命。传统的按材料成分定工艺,已远远不能滿足冷模具更复杂的工作条件,致使模具早期损坏。试验还表明,原始组织为粗粒状珠光体845℃淬火和原始组织为细片状珠光体20℃淬火时均可获得较高的弯曲疲劳极限。
In this paper, the primary structure of GCr15 steel cold mold was refined by high temperature solution carburizing and then quenched by four cycles of low temperature short-time heating quenching and austenite grain refinement controlling martensite morphology ; And spheroidization plus conventional process of quenching rotary bending fatigue properties and fracture morphology analysis. Thus seeking to improve the service life of cold molds the best heat treatment process. Tests show that in the cold mold heat treatment production, the mold should first be based on service conditions and damage forms to determine the corresponding failure resistance index, and then select a reasonable heat treatment process, so as to further tap the potential of the material to extend the service life. The traditional composition of materials by process, has been far unable to meet the more complex cold working conditions, resulting in early damage to the mold. The test also showed that the original structure of the coarse-grained pearlite 845 ° C quenching and the original organization of fine pearlite 20 ° C quenching can get higher bending fatigue limit.