激光功率对TC4熔覆层组织与耐磨性能的影响

Effects of Laser Power on Microstructure and Wear Resistance of TC4 Cladding Layer

研究了激光功率对TC4钛合金熔覆层组织与抗摩擦磨损性能的影响。结果表明,激光功率对熔覆层的组织、显微硬度、抗摩擦磨损性能有一定影响,但对元素分布没有影响。熔覆层比基体具有更好的抗氧化性和更高的显微硬度,但抗摩擦磨损性能下降。当激光功率为2500 W时,熔覆层最窄,呈不规则波浪状,结合区域附近有孔隙,整体效果较差。当激光功率为2750 W时,结合区域附近有少量单独气泡,但熔覆层的平均显微硬度最高。当激光功率为3000W时,熔覆层整体形貌和组织的质量最好,熔覆层与基体结合紧密,没有熔渣或孔隙,形成了性能良好的冶金结合,并且熔覆层的抗摩擦磨损性能最接近基体。

The effects of laser power on the microstructure and friction and wear resistance of TC4 titanium alloy cladding layer were studied. The results show that laser power has a certain effect on the microstructure, microhardness and wear resistance of the cladding layer, but doesn＇t affect the distribution of elements. Besides, the cladding layer has better oxidation resistance and higher microhardness than the substrate, but the wear resistance decreases. When the laser power is 2500 W, the cladding layer is the narrowest, presenting an irregular wavy shape with air voids in the transition region, so the overall effect is poor. When the laser power is 2750 W, there are a small number of single air voids in the vicinity of the transition region, but the microhardness of the cladding layer is the highest on the average. When the laser power is 3000W, the quality of the overall morphology and microstructure of the cladding layer is the best. The cladding layer and the substrate are closely combined by forming a better metallurgical bonding without any slags or voids, and the friction and wear resistance of the cladding layer is the approximate to the substrate.