为了研究磨面位置对20CrMnTiH钢末端淬透性的影响,对20CrMnTiH钢试样不同磨面的硬度进行测试,采用光学显微镜及扫描电镜观察其显微组织,并用红外碳硫分析仪及直读光谱仪对其化学成分进行分析。结果表明:20CrMnTiH钢试样外围磨面的硬度有较大差异,精确标识磨面位置对钢的末端淬透性测定结果的准确性非常关键;显微组织的不同是导致试样硬度差异大的直接原因,而化学成分的不均匀性是硬度差异大的根本原因。

In order to study the effect of the grinding surface position on the end hardenability of 20CrMnTiH steel, the hardness of 20CrMnTiH steel samples with different grinding surfaces was tested. The microstructure was observed by optical microscope and scanning electron microscope, and the chemical composition was analyzed by infrared carbon-sulfur analyzer and direct reading spectrometer. The results show that the hardness of the peripheral grinding surface of the 20CrMnTiH steel sample was quite different, and the accurate identification of the grinding surface position was very important for the accuracy of the end hardenability test results of the steel. The difference of microstructure was the direct cause of the hardness difference of the sample, and the inhomogeneity of chemical composition was the root cause of the hardness difference.