45~#碳钢激光相变硬化层磨损特性的研究

本文在相同条件下对激光相变硬化处理、淬火-回火及未经处理的45~#碳钢的磨损特性进行了对比试验研究。结果表明,激光相变硬化处理明显地提高了材料表面的抗粘着和抗擦伤能力,因而可以使其在一定负荷和往复速度下的耐磨性能提高一个数量级。往复速度(频率)、负荷对激光相变硬化层和淬火-回火试样之磨损率的影响不同:淬火-回火试样的磨损率随着负荷的增大而迅速增大,但相变硬化层在负荷低于294N时的磨损率增加十分缓慢,只有当负荷超过294N之后才迅速增大;淬火-回火试样的磨损率是随往复频率的增大而迅速降低,而相变硬化层的磨损率随着往复频率的增大却是先上升而后下降,但其量值的变化较小,当往复频率高于每分钟500次时,二者的磨损率基本相同。

Study on the Wear Characteristics of Laser Transformation Hardened Layer of 45# Carbon Steel

The wear characteristics of laser transformation hardened, quench-tempered and untreated 45# carbon steel have been studied under 98N of load, 100 times per minute of reciprocating frequency (reciprocating distance is 0.1 metre) and 6000 times of reciprocating, the results are as follows: a. The martensite was formed on the surface of 45# carbon steel after laser transformation hardening treatment, therefore the microhardness of the surface increases by 2-3 times. b. The laser transformation hardening treatment results in the change of wear course of 45# carbon steel. Under dry friction,the wear resistance of the treated 45# carbon steel is higher than that of untreated steel by one order of magnitude. c. The wear rate of quench-tempered sample increases rapidly with increasing load. When the load is less than 294N, the wear rate of laser transformation hardening treated sample increases slowly, above 294N of load the wear rate increases significantly. d. Under given testing conditions and the reciprocating frequency is less than 500 times per minute, the wear rate of transformation hardening treated sample is always less than that of quench-tempered sample. When the reciprocating frequency is more than 600 times per minute, both of wear rates make no much difference.