摘要
为改进钛合金的耐磨性能,开发在高温环境、大温度落差条件下使用具有热应力缓和功能的新型涂层,应用激光技术在钛合金表面制备了钛基梯度功能耐磨涂层,分析了梯度层宏观形貌和微观组织,并测试了各主要元素梯度变化规律。结果表明,梯度层和基材实现良好冶金结合,白亮熔合线区宽度10～20μm。随着氧化铬含量的改变,各梯度层微观组织均发生变化。各层之间过渡缓和自然,平行间距均为0.3mm。第一层以等轴晶为主,第二层绝大多数为细化的球状、块状颗粒和少部分树枝状晶粒,第三层以枝晶为主。各元素SEM线扫描分布规律和理论设定规律总体趋势一致,符合梯度规律变化的理论要求。
To improve the wear-resistance of Ti-6Al-4V, evolving thermal stress relaxation materials with hot environment and excessive temperature differentials, laser cladding with Ti-based functional gradient wear-resisting coating on Ti-6Al-4V alloy substrate was carried out, and macrography pattern, microstructure, as well as gradient distribution regularities of different components, in the gradient coatings was examined. The results showed that a white narrow metallurgical bonding zone was formatted at interface between the cladding and the substrate, about 10-20μm. The height of every layer was about 0.3mm. The primary microstructure of the first layer was equiaxed crystal. The second was composed of refining bulbshaped massive particles and small quantity dendritic crystal. And the third was dendritic crystal. The SEM line scanning regularities of distribution of essential elements were accordant with theoretical setting value.
出处
《应用激光》
CSCD
北大核心
2010年第5期370-373,共4页
Applied Laser
基金
国家博士后科学基金项目(项目编号:20060391000)
关键词
钛基梯度功能
耐磨涂层
激光
金相组织
Ti-based functional gradient
wear-resistant coating
laser
microstructure
