Ti-6Al-4V激光TiC合金化涂层组织及其磨损行为

Rapidly solidified structure and their wear behaviour of Ti-6A1-4V alloy laser surface alloyed with TiC

摘要: 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白层。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。

Abstract: This paper deals with the rapidly solidified structures and their wear behaviours of Ti-6Al-4V alloy laser surface alloyed with TiC. The results show that the wear resistance of TiC-alloyed specimens is 5~20 times as much as that of Ti-6Al-4V.The analyses with TEM, SEM, SEM, XRD show that the upper part of alloyed zone mainly consists of fast growing dendrite with orientation almost perpendicular to the surface, the lower part mainly consists of martensites, and the top of the zone is a white TiN/TiC.film Unlubricated sliding wear test shows that different structures have different wear resistance.The transition of wear mechanism depends upon normal load, stucture and hardness.