选用硝盐、快速淬火油作为淬火介质,分别对17CrNiMo6渗碳齿轮的三齿齿形试样进行了淬火+回火处理,分析了淬火介质冷却能力、模数、齿根下截面厚度对齿轮心部硬度、心部组织及对应含碳量的影响。结果表明,采用冷却能力较强的硝盐介质淬火时齿轮可以获得较高的心部硬度,心部板条马氏体形态尺寸更细,对应含碳量较低;在同种介质下淬火,随着齿轮模数、齿根下截面厚度的增大,心部硬度下降,模数较大的齿轮对应含碳量低,齿根下截面厚度较薄的齿轮心部板条马氏体更为明显。 Select the nitrate salt, rapid quenching oil as the quenching medium, respectively, on the 17CrNiMo6 carburized gear three-tooth tooth-shaped specimens were quenched + tempering, quenching medium cooling capacity, modulus, under the root section of the thickness of the gear heart Ministry of hardness, the organization of the heart and the corresponding carbon content. The results show that the gear can obtain higher core hardness when the cooling medium is quenched with nitrate salt, and the shape and size of the martensite in the heart plate are finer and the corresponding carbon content is lower. Under the same medium quenching, With the increase of the gear modulus and the thickness of the under-root section, the hardness of the core decreases. The larger modulus of the gear corresponds to the lower carbon content and the martensite of the heart of the gear under the lower root section is more obvious.