论文部分内容阅读
本文综述了摩擦、磨损机理,粉末冶金耐磨材料及激光表面相变硬化的概况。为提高汽车用各种粉末冶金零部件的使用寿命,作者对十三种粉末冶金材料进行了激光相变硬化处理并用正交试验法寻求激光处理的最佳工艺参数。金相显微观察表明,经过激光处理,材料表面由原始的片层状珠光体组织转变为板条状马氏体组织。处理面的显微硬度值比未处理的高2—5倍。用称重法测定磨损量,表明经过激光处理后材料的耐磨性能有明显提高。根据试验结果,分别建立了经激光处理和未经激光处理材料在磨损过程中磨屑形成模型。两模型之间差异很大。
This paper summarizes the friction, wear mechanism, powder metallurgy wear-resistant materials and laser surface transformation hardening overview. In order to improve the service life of all kinds of powder metallurgy parts for automobiles, the authors carried out the laser phase-change hardening treatment on thirteen kinds of powder metallurgy materials and found out the best processing parameters of the laser treatment by the orthogonal test method. Metallographic observation showed that the surface of the material transformed from lamellar pearlite to lath martensite after laser treatment. The microhardness of treated surfaces is 2-5 times higher than that of untreated ones. Weighing the amount of wear measured, indicating that after laser processing material wear resistance improved significantly. According to the experimental results, the formation models of wear debris during the wear process were established respectively with or without laser treatment. There is a big difference between the two models.