轮廓扫描速度对SLM成形TC1钛合金侧面质量的影响  

Role of contour scanning speed on the lateral surface quality of TC1 alloy printed by selective laser melting

作　　者：胡家齐 董定平 慈世伟 蔡小叶 谢隋杰 程宗辉 HU Jiaqi;DONG Dingpin;CI Shiwei;CAI Xiaoye;XIE Suijie;CHENG Zonghui(State-owned Wuhu Machinery Factory,Wuhu 241000,China)

机构地区：[1]国营芜湖机械厂,安徽芜湖241000

出　　处：《粉末冶金工业》2024年第2期44-48,共5页Powder Metallurgy Industry

基　　金：安徽省重点领域补短板产品和关键技术攻关项目(JB21049)。

摘　　要：采用选区激光熔化(Selective laser melting,SLM)工艺以不同的轮廓扫描速度制备了TC1钛合金样品,测定了样品的侧面粗糙度,观察了样品侧面近表面缺陷特征并测试了其显微硬度。结果表明:随轮廓扫描速度的增加,样品的侧面粗糙度Ra由8.09μm提升至12.27μm,这主要是由于球化与表面粘附的部分熔化粉末导致的。当轮廓扫描速度较慢时(300 mm/s),产生匙孔效应,近表面形成了大量气孔缺陷。当轮廓扫描速度较高时(900 mm/s),能量密度较低,近表面区域形成了未熔合缺陷。此外,低的轮廓扫描速度使能量密度增加,轮廓区熔池冷却速度减小,从而使近表面区域的硬度降低。高的轮廓扫描速度有助于降低近表面区域硬度的损失。Selective laser melting(SLM)process is one of the key three-dimensional printing technologies,which has been widely applied into the manufacturing of components with geometrically complex structures.Most of the selective laser melting printed components should subject to machining operation to satisfy the requirement of surface quality,like polishing and grounding.It is attractive that the comparatively low demand of printed component surface quality can be met through tailoring the parameters of printing processes.The subsequent machining procedure can be thus reduced with shortened production cycle and optimized cost-effectiveness of manufacturing.So it is vitally important to elucidate the effect of SLM parameters on the surface quality of printed components.In the current study,a series of distinct contour scanning speed were utilized to prepare SLMed specimens of TC1 titanium alloy.The sections of specimen lateral surface were observed by Axio Oberver 3M microscope.The printing defects in the lateral near-surfaces of specimens were also characterized.The corresponding outline of near-surface boundaries were further extracted and processed.The data of outline was then statistically obtained to quantitatively calculate the roughness of the printed specimen surfaces.The Vickers hardness variation in the area within the range of 0.05 to 0.8 mm away from the lateral surface was measured by Wilson VH3100 hardness tester.It is found that the roughness(Ra)of the SLMed specimens lateral surfaces increases from 8.09μm to 12.27μm with the rise of contour scanning speed,which can be primarily attributed to the balling behavior and incomplete melting of powder adherent with the surface.To be specific,a large amount of air pore defects form around the near-surfaces of the components due to the keyhole effect of melted powders.The air pores mainly distribute in the areas 80μm to 130μm away from the near-surfaces.The size of these air pores varies from 20μm to 50μm.On the other hand,unfused defects occurred in the nea

关 键 词：轮廓扫描速度 表面粗糙度 气孔 未熔合 显微硬度 

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]