合金基体上激光熔覆Ti+Al粉末的显微组织分析

Analysis of Microstructure and Phases of Laser Cladding Ti+Al Powders on Ti-6Al-4V Alloy Substrate

在合金表面进行了Ti+Al的激光熔覆试验研究,利用SEM分析手段对Ti+Al熔覆层的显微组织进行了分析,阐述了熔覆层强化相的形成机制,显微组织分析表明,Ti-6Al-4V合金表面Ti+Al激光熔覆层的显微组织沿层深方向可分为熔覆区、结合区和热影响区3个区域,在3个区域呈现出不同的组织形态,对基体和熔覆层进行的硬度测试表明,由基体向熔覆层的硬度变化呈上升趋势,在结合区和最外层区域有所下降。

Laser Ti+Al cladding experiment is carried out on Ti-6Al-4V alloy substrate,microstructure of the clad layer is analyzed by SEM and its forming mechanism of strengthening phase is discussed. Micro structural analysis show that the clad coating can be divided into three zones along the depth direction,including the clad,binding and heat-affected zones. The microstructure of cladding layer varies with these three zones. The results of measuring microhardness of the cladding layer show that the microhardness increases from the substrate to cladding layer,and decreases at binding zone and the outer layer of cladding layer.