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针对5Cr4W5Mo2V热作模具钢的硬度、耐磨性、耐回火性和热稳定性较好,但冲击韧性相对较低的问题,利用下贝氏体组织兼具强度和韧性的特点,对5Cr4W5Mo2V钢进行等温淬火热处理改善其韧性,并通过显微组织与力学性能对比分析,优选最佳等温淬火时间参数。结果表明,5Cr4W5Mo2V钢经1150℃奥氏体化,330℃等温淬火60 min以上处理后,得到下贝氏体含量在60%以上的下贝氏体+马氏体+残留奥氏体复相组织,试样的冲击韧性明显提高,其中等温淬火120 min时达到247.75 J/cm2。
For 5Cr4W5Mo2V hot work die steel hardness, wear resistance, tempering resistance and thermal stability is better, but the impact toughness is relatively low, the use of lower bainite both strength and toughness characteristics of 5Cr4W5Mo2V steel Isothermal quenching heat treatment to improve its toughness, and through the microstructure and mechanical properties of comparative analysis, optimization of the best isothermal quenching time parameters. The results show that 5Cr4W5Mo2V steel is austenitized at 1150 ℃ and isothermal quenched at 330 ℃ for 60 min, and the lower bainite + martensite + retained austenite complex with lower bainite content of 60% , The impact toughness of the sample significantly increased, of which isothermal quenching 120 min to reach 247.75 J / cm2.