激光选区熔化工艺对CoCrWMo合金的组织和力学性能的影响  

Effect of selective laser melting parameters on microstructure and mechanicalproperties of CoCrWMo alloy

作　　者：赵霄昊 张鹏 潘霏霏 郭少帅 刘立科 梁书锦 ZHAO Xiaohao;ZHANG Peng;PAN Feifei;GUO Shaoshuai;LIU Like;LIANG Shujin(Sino-Euro Materials Technologies of Xi′an Co.,Ltd,Xi′an 710018,China;Shaanxi Medical Device Quality Institute,Xianyang 712046,China;Northwest Institute for Non-ferrous Metal Research,Xi′an 710016,China)

机构地区：[1]西安欧中材料科技有限公司,陕西西安710068 [2]陕西省医疗器械质量检验院,陕西咸阳712046 [3]西北有色金属研究院,陕西西安710016

出　　处：《粉末冶金工业》2023年第4期97-105,共9页Powder Metallurgy Industry

基　　金：陕西省重点项目工业领域项目(2018ZDXM-GY-132)。

摘　　要：利用激光选区熔化技术(SLM)制备CoCrWMo支架卡环成形件,研究了不同激光功率和不同扫描速度的适配性,以及成形件组织及性能的特征。利用光学金相显微镜、扫描电子显微镜、能谱分析仪、Image Pro Plus图像分析软件进行显微组织分析及表征。随后,从15组实验中选取最优工艺参数制备支架卡环,并对其进行力学性能检测。实验结果表明,采用最优工艺的成形件具备良好的综合力学性能,成形件抗拉强度和屈服强度分别为(1 066±33)MPa和(849±30)MPa,其退火态显微组织主要由γ-fcc相组成,相比例不低于95%,断口伸长率可达20%,断口形貌呈现典型的韧窝特征。实验表明,SLM能量密度在(19.5~26.0)J/mm3区间内,打印件孔隙率会超过0.2%;SLM能量密度在(26.0~36.5)J/mm3区间内,打印件孔隙率均低于0.1%。打印件的孔隙率主要受激光功率、扫描速度等打印参数匹配性影响,孔隙率与能量密度无明显量化关联。Selective Laser Melting is widely applied to dental restoration.In this paper,different sets of laser power and varying scanning velocity were investigated.Optical microscopy(OM),scanning electron microscopy(SEM),energy dispersive spectrometer(EDS)and Image Pro Plus(IPP)were exploited to analyze microstructure and constituent phases.Tensile testing was performed to evaluate corresponding performance.The prime set of parameters have been selected from 15 parameter sets.The prime set possessed excellent combination of strength and ductility while the elongation is up to 20%with dimples characterization.The ultimate tensile strength and yield strength was(1066±33)MPa and(849±30)MPa,respectively.The microstructure is composed ofγ-fcc phase,of which the percentage is over 95%.During printing,most of porosity surpassed 0.2%in relative low energy density(19.5~26.0)J/mm3.On the contrary,high energy density(26.0~36.5)J/mm3 tends to obtain lower porosity which is below 0.1%.The experiment displays porosity is deeply corresponding to printing parameters,like laser power and scanning velocity,rather than energy density.

关 键 词：支架 卡环 钴铬钨钼合金 超高转速等离子旋转电极 激光选区熔化 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG132[一般工业技术—材料科学与工程]