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对Ti-6Al-4V激光TiC合金化涂层的快速凝固组织及其磨损行为的研究结果表明,激光TiC合金化的试样,其耐磨性显著提高,为原基材的5~20倍。TEM,SEM.XRD分析表明,合金化表层上部主要为快速凝固枝晶区,枝晶位向基本垂直于表面;下部为α'马氏体和残留β相组成的细晶区。此外,在最表层还存在TiN/TiC自层。干滑动摩擦磨损试验表明,显微组织不同,磨损抗力也不同,因而磨损机制也不同,磨损机制的转化与正向载荷,显微组织及硬度有关。 相似文献
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The behaviour of oxidation at elevated tem-peratures and fretting in the laser-alloyed layer ofTi-6Al-4V with the addition of Pr was studied.The results show that the addition of Pr changes thestructure of oxide scale of Ti-6Al-4V,controls theshort-range diffusion of oxygen to thescale/substrate interface and increases the adhe-sion and ductility of the scale,thus changing theoxidation kinetics and considerably reducingoxidation rate.The analysis of fretting test showsthat the existence of high hardness layer in the al-loyed zone,fine dendrites perpendicular to the sur-face of the high hardness layer and the oxide scaleproduced during fretting at elevated temperaturesare all beneficial to the improvement of wear resist-ance. 相似文献
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