激光淬火与中频感应淬火对比研究

利用摩擦磨损实验机对45CrNi钢开展了激光淬火和中频感应淬火摩擦磨损对比实验研究，并利用扫描电镜(SEM)、投射电镜(TEM)和X射线衍射仪(XRD)等设备对两种淬火试样硬化层进行了微观分析。结果表明，在载荷50～250 N条件下，激光淬火试样的耐磨性比中频感应淬火试样提高了4%～21%;中频感应淬火试样的摩擦系数略大于激光淬火试样的摩擦系数。两者的主要磨损形式均为磨粒磨损，但中频感应淬火试样磨损后表面犁沟的深度和宽度大于激光淬火试样表面犁沟的深度和宽度。两种淬火方法淬硬层均为板条马氏体和少量针状马氏体的混合组织，但中频感应淬火淬硬层有大量的碳化物析出，碳化物含量多且碳化物颗粒大、残余奥氏体多。

Comparison of Laser Hardening and Medium Frequency Induction Hardening

Friction and wear comparison tests of laser hardening and medium frequency induction hardening were performed using friction wear testing machine. And the microstructure of hardened layer was characterized by SEM, TEM and X-ray Diffractometer. The test results show that the wear resistance of laser hardening is 4%～21% higher than that of medium frequency induction hardening under the load of 50～250 N. However, the friction coefficient of laser hardened specimens is lower than that of medium frequency induction hardened ones. The frictional behaviour of them is grain abrasion. But the width and the depth of wear trace treated by medium frequency induction hardening were greater than it treated by laser hardening. The microstructures of hardened layer are lath martensite and less acicular martensite. But more carbide was been precipitated in hardened layer treated by medium frequency induction. And more residual austenite was leaved in it.