激光合金化制备WC颗粒增强复合层耐磨性研究

通过铸造WC和Co包WC与Ni45粉末的复合添加, 运用激光合金化技术在中碳钢表面制备以WC颗粒为增强相的Ni基复合层, 对复合层的微观组织、硬度及耐磨性进行了测试与分析。结果表明: 激光合金化技术可在中碳钢表面制备均匀的WC颗粒增强合金化层, 合金层的硬度及耐磨性得到显著提高。从表面磨损形貌可知, 合金层在室温干摩擦过程中, 均发生不同程度的磨料磨损和粘着磨损, 强化机理主要为第二相强化, WC＋Ni45制备的合金层耐磨性最佳。

The Study of Wear Resistance of WC Carbide-Reinforced Composite Coating Prepared by Laser Surface Alloying

In order to improve the surface friction and wear properties of steel 45, prepared by laser alloying with WC particles as reinforcement of the Ni-based alloy layer to study the laser alloying technique for surface modification of materials, analysis of the microstructure of the alloy layer, hardness and wear resistance. The results showed that: laser surface alloying to obtain a uniform layer of WC particle-reinforced composites, an increase of 45 steel surface hardness and wear resistance. We can see from the morphology of wear surfaces, laser alloying layer at room temperature dry friction process, both in different degrees of abrasive wear and adhesive wear, the strengthening mechanism is mainly to strengthen the second-phase particles. The wear capacity of WC＋Ni45 alloy coating was the lowest and with the best wear resistance.