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研究了奥氏体化温度和回火温度对精锻齿轮用H13模具钢显微组织和力学性能的影响。结果表明,随着奥氏体化温度的升高,合金元素溶入的越多,组织趋于均匀,但温度过高则晶粒粗化明显,析出碳化物较多不利于提高钢的塑性和韧性,选取1030~1050℃奥氏体化温度较为适宜。二次回火温度控制在560~600℃之间,获得的基体组织为回火索氏体、合金碳化物和少量回火马氏体,硬度介于48.9~46.4 HRC间,有利于良好的强韧性配合。
The effects of austenitizing temperature and tempering temperature on microstructure and mechanical properties of H13 die steel forging gear were studied. The results show that as the austenitizing temperature increases, the more alloying elements are dissolved, the more uniform the microstructure. However, when the temperature is too high, the grain coarsening is obvious. The precipitation of carbide is not conducive to increasing the ductility of the steel Toughness, select 1030 ~ 1050 ℃ austenitizing temperature is more appropriate. Secondary tempering temperature control between 560 ~ 600 ℃, the obtained matrix is tempered sorbite, alloy carbides and a small amount of tempered martensite, hardness between 48.9 ~ 46.4 HRC, is conducive to good toughness Cooperation.