中文摘要：

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。

英文摘要：

Effects of austenitizing temperature and tempering temperature on microstructure and properties of H13 die steel for precision forged gear were studied. The results show that the dissolution of alloying elements increases and the microstructure becomes uniform with increase of the austenitizing temperature. However, the high austenitizing temperature leads to grain coarsening and more carbides precipitation which deteriorates the ductility and toughness of the steel. The suitable range of austenitizing temperature is identified as 1030-1050 ℃. The tempering temperature range is 560-600 ℃,where the microstructure is composed of tempered sorbite,carbide and more or less tempered martensite. The hardness is located between 48. 9-46. 4 HRC which benefits to obtain the better combination of strength and toughness.