拼接顺序对双激光选区熔化成形TC4钛合金成形性的影响  

Effect of Scan Order of Overlap Area on Forming Qualities of TC4 Alloy Fabricated by Selective Dual-Beam Laser Melting Technique

作　　者：杨圣昆 谢印开 胡全栋 李怀学 YANG Shengkun;XIE Yinkai;HU Quandong;LI Huaixue(AVIC Manufacturing Technology Institute,Beijing 100024,China;Science and Technology on Power Beam Processes Laboratory,Beijing 100024,China;Beijing Key Laboratory of High Power Beam Additive Manufacturing Technology and Equipment,Beijing 100024,China;Aeronautical Key Laboratory for Additive Manufacturing Technologies,Beijing 100024,China)

机构地区：[1]中国航空制造技术研究院,北京100024 [2]高能束流加工技术重点实验室,北京100024 [3]高能束流增量制造技术与装备北京市重点实验室,北京100024 [4]增材制造航空科技重点实验室,北京100024

出　　处：《航空制造技术》2022年第5期93-99,共7页Aeronautical Manufacturing Technology

基　　金：国家重点研发计划(2017YFB1104002);国防基础科研计划(JCKY2019205A002)。

摘　　要：为了提高多激光选区熔化技术在拼接区域的成形质量,研究了不同拼接顺序对双激光选区熔化成形TC4钛合金拼接区域的表面形貌、内部缺陷、拉伸性能等成形性的影响。结果表明,相邻层间条带无相对偏转时,双激光逆序拼接因激光熔化扫描过程中粉末的剥蚀效应导致拼接区域表面起伏较大,且易于产生内部缺陷;双激光顺序拼接可大幅消除拼接区域表面起伏,且内部缺陷大幅减少;设置67°相邻层间条带相对偏转角时,双激光顺序拼接试样可避免内部缺陷产生,改善拼接区域表面形貌,显微硬度及抗拉强度则与逆序拼接时基本一致。采用顺序拼接和相邻层间条带相对偏转可改善双激光选区熔化拼接区域的成形质量。In arder to improve the overlap quality of multi-beam selective laser melting,the effects of scan order of overlap area on surface appearance,metallurgical defects,tensile properties and other formability of TC4 samples have been investigated.The results show that,when the strips between adjacent layers have no relative deflection,due to the denudation of the powder,reverse order overlap causes large surface fluctuation at the overlap area using dual lasers,and is easy to cause defects of poor fusion;In order overlap can greatly eliminate surface fluctuations in the overlap area and reduce internal defects;When setting the relative strip deflection angle between adjacent layers of 67°,in order overlap can avoid internal defects and improve the surface morphology of the overlap area,and the microhardness and tensile strength are basically the same as when using reverse order.The in order overlap and the relative strip deflection between adjacent layers can improve the forming quality of the overlap area when using selective multi-beam laser melting technique.

关 键 词：增材制造(AM) 激光选区熔化(SLM) 拼接顺序 双激光拼接 条带扫描 TC4钛合金 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG146.23[一般工业技术—材料科学与工程]