目的 以阻燃钛合金Ti-25V-15Cr为研究对象，主要研究V、Cr元素粉末的添加方式对激光熔覆沉积Ti-25V-15Cr合金的显微组织及成形性的影响。方法 分别以经过粘结包覆Ti(150 mm)+V(15 mm)+ Cr(15 mm)、直接混合Ti(150 mm)+V(15 mm)+Cr(15 mm)以及直接混合Ti(150 mm)+V(100 mm)+Cr(150 mm)的元素混合粉末为原料，进行激光熔覆沉积实验，对沉积试样的高度、宽度以及显微组织特征进行研究。结果 以粘结包覆Ti(150 mm)+V(15 mm)+Cr(15 mm)和直接混合Ti(150 mm)+V(100 mm)+Cr(150 mm)为原料获得的沉积试样，其沉积效率显著高于直接混合Ti(150 mm)+V(15 mm)+Cr(15 mm)为原料的沉积试样，且沉积试样组织由相对细小的等轴晶和类等轴晶组成，而直接混合Ti(150 mm)+V(15 mm)+Cr(15 mm)为原料的试样组织主要由外延生长的柱状晶组成。结论 以粘结包覆Ti(150 mm)+V(15 mm)+Cr(15 mm)为原材料时，在提高沉积效率的同时能够一定程度上细化晶粒。该方法对激光熔覆沉积材料的成形性、成分均匀性及显微组织具有显著影响。

The work aims to investigate the effect of the addition method of elemental powders V and Cr on the microstructure and formability of laser cladding deposited Ti-25V-15Cr alloy with Ti-25V-15Cr alloy as research subject. The deposition experiments were performed from three kinds of powder feedstock, including bonded coated Ti(150 mm)+V(15 mm)+Cr(15 mm), directly mixed Ti(150 mm)+V(15 mm)+Cr(15 mm) and directly mixed Ti(150 mm)+V(100 mm)+Cr(150 mm), and the height, width and microstructure of the deposited samples were analyzed. Deposited efficiency of the samples from the bonded coated Ti (150 mm)+V(15 mm)+Cr(15 mm) and directly mixed Ti(150 mm)+V(100 mm)+Cr(150 mm) were much higher than that from the directly mixed Ti(150 mm)+V(15 mm)+Cr(15 mm). The microstructure of the deposited samples from Ti(150 mm)+V(15 mm)+Cr(15 mm) and from directly mixed Ti(150 mm)+V(100 mm)+Cr(150 mm) were mainly composed of fine equiaxed grains and near-equiaxed grains, while that from the directly mixed Ti(150 mm)+V(15 mm)+Cr(15 mm) consisted of epitaxially columnar grains. When the bonded coated Ti (150 μm) + V (15 μm) + Cr (15 μm) is used as the deposited material, the grain size can be refined to some extent while the deposition efficiency can be improved. This method has a significant influence on the formability, composition uniformity and microstructure of the laser cladding deposited samples.