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本文较系统地研究了在40Cr钢马氏体基体中存在有8～10%不同形态(细粒状、粗块状、半网状)铁素体时机械性能的变化规律,并探讨了其强韧化机理。研究结果表明,40Cr钢马氏体中存在少量铁素体时,铁素体形态对钢的机械性能产生重要影响。在低、中温回火状态下,细粒状铁素体复相组织的强度和塑性与全马氏体相当,但韧性和疲劳性能优于后者;而半网状铁素体复相组织的强度、塑性和韧性均属最低。随回火温度升高,铁素体形态对其组织的强度、塑性和韧性的影响逐渐减小;高温回火后,具有不同形态铁素体复相组织的强韧性基本相当,但存在铁素体时有利于疲劳性能的改善。
In this paper, we systematically studied the mechanical properties of martensite in 40Cr martensitic matrix with 8 ~ 10% different morphology (fine granular, coarse, semi-mesh) ferrite, and discussed its toughness Mechanism. The results show that the ferrite morphology has a significant effect on the mechanical properties of steel when there is a small amount of ferrite in martensite of 40Cr steel. Under the condition of low and medium temperature tempering, the strength and ductility of the fine granular ferrite composite phase are comparable to that of the whole martensite, but the toughness and fatigue properties are better than the latter. The strength of the semi-network ferrite composite phase , Plasticity and toughness are the lowest. With the increase of tempering temperature, the effect of ferrite morphology on the strength, ductility and toughness of the microstructure decreases gradually. After high temperature tempering, the strength and toughness of ferrite phase composites with different morphologies are basically the same, but the ferrite Body time is conducive to the improvement of fatigue performance.