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本文试验研究了GCr_(15)钢从控制马氏体组织形态(即减少孪晶马氏体量,增加位错马氏体量);细化奥氏体和过剩碳化物的强韧化热处理工艺及其强韧性。通过显微和断口分析,研究了GCr_(15)钢强韧性变化的微观机理。试验结果表明,获得以位错马氏体为主的低温短时间加热淬火及细化奥氏体晶粒的循环快速加热淬火,在材料保持高硬度和高强度情况下,其塑性和韧性得到显著改善,特别是断裂韧性K_1C以极大的幅度提高。获得了最佳的强韧性配合。按照冷模具的性能要求,本文进行了硬度、弯曲、冲击和断裂韧性的试验,关于冷模具钢的耐磨性,抗疲劳性能及模具使用寿命考核尚待进一步试验。
In this paper, the experimental study of GCr_ (15) steel from the control of martensite morphology (ie, reduce the amount of twinned martensite, increase the amount of dislocation martensite); refined austenite and excess carbide toughening heat treatment process And its toughness. The microscopic mechanism of the toughness of GCr_ (15) steel was studied by microscopic and fracture analysis. The experimental results show that the rapid quenching of austenite grains, which are heated and quenched at a low temperature for a short time and mainly composed of dislocation martensite, is obtained, and the ductility and toughness of the material are remarkably maintained under high hardness and high strength Improvement, especially the fracture toughness K_1C, increases to a great extent. Obtained the best strength and toughness. In accordance with the performance requirements of cold mold, this paper carried out the hardness, bending, impact and fracture toughness of the test, on the cold die steel wear resistance, fatigue resistance and die life assessment yet to be further tested.