球墨铸铁轧辊的光纤激光合金化性能

为了提高球墨铸铁轧辊的使用性能,采用光纤激光合金化系统对轧辊表面的预置合金层进行激光扫描,在球墨铸铁轧辊表面形成了冶金结合的合金化层.在最佳工艺参数条件下,分析了合金化层的耐磨性能、维氏硬度、冷热疲劳性能和显微组织.结果表明,合金化后的球墨铸铁轧辊的耐磨性能约为基体的3倍,维氏硬度也得到了明显提高,冷热疲劳性能基本相同.合金化层由亚共晶组织构成,亚共晶组织初晶相由马氏体(M)、未分解WC硬质相及共晶组织构成,共晶组织由马氏体(M)与复杂碳化物(WC、Co6W6C和Fe3C)构成.合金化层深度约为0.4 mm且组织细小.

Fiber laser alloying performance of ductile iron roller

In order to improve the service performance of ductile iron roller, the laser scanning was performed for the preset alloyed layer on the roller surface with the fiber laser alloying system, and the alloyed layer with the metallurgical bonding formed on the surface of ductile iron roller. Under the optimum processing parameters, the wear resistance, Vickers hardness, cold and thermal fatigue properties and microstructure of alloyed layer were analyzed. The results show that after alloying, the wear resistance of ductile iron roller gets improved by about 3 times, the Vickers hardness also significantly increases, while the cold and thermal fatigue properties are basically the same. The alloyed layer is composed of hypoeutectic structure, and the hypoeutectic primary phase is composed of martensite, undecomposed WC hard phase and eutectic structure. In addition, the eutectic structure is composed of martensite and complex carbides such as WC, Co₆W₆C and Fe₃C. The depth of alloyed layer is about 0.4 mm, and the microstructure of alloyed layer is fine.