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    热锻模具钢的冷热稳定性能对比

    来源:/ 日期:2022-04-14 发布人:admin


    H13模具钢和3Cr2W8V模具钢是我国目前使用非常广泛的两种锻造模具钢,其中H13模具钢因良好的综合力学性能及抗热冷疲劳性能胜任一般热模锻造的需求。但由于H13模具钢作为中耐热型执作模具钢,其工作温度不宜超过600度,且淬透性差不利于制造大截面模具使用。
    H13 die steel and 3Cr2W8V die steel are two widely used forging die steels in China. Among them, H13 die steel is competent for general hot die forging due to its good comprehensive mechanical properties and hot and cold fatigue resistance. However, as H13 die steel is a medium heat-resistant executive die steel, its working temperature should not exceed 600 degrees, and its hardenability is poor, which is not conducive to the manufacture of large section dies.
    3Cr2W8V模具钢是我国比较早的使用且应用更加广的高强热性热锻模具钢,其热稳定性良好,使用温度可达650度,但因其冷热疲劳性能和导热性差,容易因冷热疲劳而产生龟裂。而DM模具钢为近几年研发出的新型热锻模具钢,通过3种热锻模具钢热稳定曲线的测定及微观组织的观察,对比分析3种锻造模具钢热稳定性能的优劣及在热稳定过程中微观组织的变化。
    3Cr2W8V die steel is a high-strength hot forging die steel used earlier and more widely in China. It has good thermal stability and service temperature up to 650 degrees. However, due to its poor cold and hot fatigue performance and thermal conductivity, it is easy to crack due to cold and hot fatigue. DM die steel is a new type of hot forging die steel developed in recent years. Through the measurement of thermal stability curve and observation of microstructure of three kinds of hot forging die steel, the advantages and disadvantages of thermal stability of three kinds of forging die steel and the changes of microstructure in the process of thermal stability are compared and analyzed.
    3种实验模具钢均采用电渣重熔冶炼,其化学成分如表1所示,热处理工艺及硬度值如表2所示,其中淬火加热冷却均在真空淬火炉中进行,等箱式回火炉稳定在实验温度下进行回火。热稳定试验的采用箱式炉分别将试样在580、620、650度保温24h,然后测试不同温度下3种实验钢的洛式硬度值。采用发射扫描电镜观察试样不同保温温度下的微观组织,采用高分辨投射电子显微镜对不同保温温度下的试样进行观察,并标定碳化物的类型。
    The three kinds of experimental die steels are smelted by electroslag remelting, and their chemical composition is shown in Table 1. The heat treatment process and hardness value are shown in Table 2. The quenching, heating and cooling are carried out in the vacuum quenching furnace, and the tempering is carried out in the box tempering furnace when it is stable at the experimental temperature. In the thermal stability test, the samples were kept at 580, 620 and 650 ℃ for 24 hours in a box furnace, and then the Rockwell hardness values of three kinds of experimental steels at different temperatures were tested. The microstructure of the samples at different holding temperatures was observed by emission scanning electron microscope, and the samples at different holding temperatures were observed by high-resolution projection electron microscope, and the types of carbides were calibrated.
    结果表明:
    The results show that:
    (1)在580、620、650度保温24h热稳试验中,DM模具钢的硬度始终高于H13模具钢和3Cr2W8V模具钢;且随着保温温度的升高,硬度前期下降的速度越快,后期均趋于平稳。
    (1) The hardness of DM die steel is always higher than that of H13 die steel and 3Cr2W8V die steel in the 24h thermal stability test at 580, 620 and 650 degrees; With the increase of holding temperature, the hardness decreases faster in the early stage and tends to be stable in the later stage.
    (2)在650度热稳定过程中,3Cr2W8V模具钢中存在W元素大量固溶于基体中,产生固溶强化作用,而DM模具钢在热稳定过程中由于亚稳相在高温下分析出M2C型碳化物产生硬化现象,同时由于大量Mn元素固溶于基体,阻碍了马氏体基体的回复,两者相辅相成保证了其优越的热稳定性能。
    (2) In the process of 650 degree thermal stability, a large amount of W element is dissolved in the matrix in 3Cr2W8V die steel, resulting in solid solution strengthening. In the process of thermal stability, DM die steel hardens due to the M2C carbide analyzed by metastable phase at high temperature. At the same time, a large amount of Mn element is dissolved in the matrix, which hinders the recovery of martensitic matrix. The two complement each other to ensure its superior thermal stability.
    以上就是为大家介绍的有关山东模具钢的详细介绍,希望对您有所帮助.如果您有什么疑问的话,欢迎联系我们.我们将以的态度,为您提供服务
    The above is the detailed introduction of Shandong die steel. I hope it will help you If you have any questions, please contact us We will provide you with professional service

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