对40Cr钢分别进行激光表面淬火(相变硬化)和加碳熔凝(白口铁化)处理,分析检测了处理后试样的显微组织、硬度和耐磨性,并将其与普通淬火态试样进行比较。结果表明: (1)激光淬火试样在两种不同磨损条件下均具有比普通淬火更好的耐磨性。(2)经激光表面加碳熔凝处理后,40Cr钢表面可获得抗磨粒磨损能力较高的白口铁薄层(厚约0.15 mm),但白口铁层/相变硬化区之间的过渡带所存在的较多残余奥氏体将使钢的耐磨性在一定程度上受到削弱。

Laser quench and carbon alloying of 40Cr steel (Chinese brand)is performed on the surface. Carbon alloying is accomplished with pre-deposited carbon layer on the surface and scanning with the laser afterwards. The microstructure, micro-hardness as well as the wear properties were tested and compared with those obtained from the ordinary quenched work piece. It shows that: (a) the wear resistance of the laser quenched pieces is always superior than that obtained with ordinary quenched work piece; (b) after the carbon alloying, a thin layer of white iron was obtained which is very hard, but due to the presence of the residual austenite between the white iron layer and substrate, the wear properties of white iron layer is weakened.