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对日本常用的热作模具钢SKD61(相当于H13钢)进行气体软氮化处理,研究氮化处理对热作模具钢微观组织、热熔损性能及热疲劳性能的影响。试验选用传统型A及低Si高Mo含量的改良型B热作模具钢为研究材料,进行热处理研究。结果表明:两种热作模具钢经气淬及回火处理后,组织均为回火马氏体。氮化处理试片表面主要为Fe_3N与Fe_4N相,且在525℃回火处理后有二次硬化现象。改良型钢种比传统型更能抗铝熔损,且经580℃软氮化处理80 min后,能有效降低熔损率。B钢的抗疲劳性优于A钢,但软氮化处理并不能有效提升耐热疲劳性。
In this paper, the gas nitrocarburizing treatment is applied to the SKD61 hot-work die steel (equivalent to H13 steel) commonly used in Japan. The effects of nitriding on the microstructure, hot-melt loss and thermal fatigue properties of hot die steel were studied. The experiment uses traditional type A and low Si high Mo content improved B hot work die steel as the research material, heat treatment research. The results show that the two hot-working die steels are tempered martensite after gas quenching and tempering. The surface of the nitriding test specimen is mainly Fe_3N and Fe_4N phase, and the secondary hardening phenomenon after tempering at 525 ℃. The modified steel is more resistant to aluminum loss than the conventional steel, and can effectively reduce the melting loss after soft nitriding 580 ℃ for 80 min. B steel fatigue resistance is better than A steel, but nitrocarburizing treatment can not effectively improve thermal fatigue resistance.