激光熔覆TC4钛合金加工轨迹对表面形貌的影响

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英文篇名：Effects of Machining Track of Laser Cladding TC4 Titanium Alloy on Surface Morphology 作者：王涛 ; 李阳 ; 王宁 ; 张立峰 ; 唐杰 英文作者：WANG Tao;LI Yang;WANG Ning;ZHANG Lifeng;TANG Jie;Departm ent of Mechanical Electronic Engineering, Civil Aviation University of China;Department of Mechanical Engineering, Tsinghua University;College of Electronic Information and Automation, Civil Aviation University of China; 关键词：熔覆层 ; 修复 ; 加工轨迹 ; 表面形貌 英文关键词：cladding layer;;repair;;processing track;;surface morphology 中文刊名：SJGY 英文刊名：Hot Working Technology 机构：中国民航大学机械电子工程系;清华大学机械工程系;中国民航大学电子信息与自动化学院; 出版日期：2019-04-28 13:57 出版单位：热加工工艺 年：2019 期：v.48;No.510 基金：国家自然科学基金民航联合基金项目(U1633104);; 工信部重大专项项目(2013ZX04001071);; 数字制造装备与技术国家重点实验室开放课题资助项目(DMETKF2017018) 语种：中文; 页：SJGY201908036 页数：4 CN：08 ISSN：61-1133/TG 分类号：146-149

摘要

损坏叶片经激光熔覆修复后,切削加工复形的质量,决定了叶片重新服役的工作性能。选取Ti-6Al-4V(TC4)为实验材料,利用激光熔覆技术,制备效果较好的熔覆层;选择加工路径与激光扫描轨迹方向相同和垂直两种加工方式,对单道激光熔覆层进行铣削复形加工实验。结果发现,加工路径与激光扫描轨迹方向垂直时,表面形貌较好。x方向(激光扫描方向)的组织排布较为紧密,晶粒较为细小和质密,晶界明显。y方向(垂直于激光扫描方向)的组织粗大,且存在夹渣和孔洞。熔覆层的微观组织各向异性,是造成复形表面形貌差异的原因。
        After the damaged blade was repaired by the laser cladding, the quality of the re-contouring by cutting determines its working performance in re-service. Ti-6 Al-4 V(TC4) was selected as the experimental material, and the cladding layer with good effect was prepared by laser cladding technique. The processing paths parallel to and vertical to laser scanning track direction were chosen, and then the experiment of re-contouring processing was carried out on single-channel laser cladding layer. The results show that the surface morphology is better when the machining path is perpendicular to the direction of the laser scanning track. The microstructure in the x direction(laser scanning direction) is more closely arranged,the grain is relatively small and dense, and the grain boundary is clear. The microstructure in the y direction(perpendicular to the laser scanning direction) is coarse, and there are slag and holes. The heterogeneity of the microstructure of the cladding layer is the reason of the difference of re-contouring surface morphology.

引文

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