构建方向对SLM钛合金卡环的显微结构及性能影响  

Effect of construction orientation on the microstructure and properties of SLM Ti alloy clasps

作　　者：谢文强 王洁琪[1] 庄沛林[1] 李小宇 郑美华[1] 张雯[4] 韦佩伶 XIE Wenq-iang;WANG Jieqi;ZHUANG Peilin;LI Xiaoyu;ZHENG Meihua;ZHANG Wen;WEI Peiling(Department of Stomatology,Sun Yat-sen Memorial Hospital,Sun Yat-sen University,Guangzhou 510120,China;Guangdong Provin-cial Key Laboratory of Stomatology,Guangzhou 510080,China;Stomatology Hospital of Guangzhou Medical University,Guangzhou 510000,China;Department of Stomatology,The Second Hospital of Traditional Chinese Medicine of Guangdong Province,Guangzhou,Guangzhou 510095,China;Department of Stomatology,Liuzhou Peoples Hospital,Liuzhou 545006,China)

机构地区：[1]中山大学孙逸仙纪念医院口腔科,广东广州510120 [2]广东省口腔医学重点实验室,广东广州510080 [3]广州医科大学附属口腔医院,广东广州510000 [4]广东省第二中医院口腔科,广东广州510095 [5]柳州市人民医院口腔科,广西柳州545006

出　　处：《口腔疾病防治》2019年第1期17-22,共6页Journal of Prevention and Treatment for Stomatological Diseases

基　　金：广东省科技发展专项资金项目(2016A020215067);广东省公益研究与能力建设专项资金项目(2014A020212092)

摘　　要：目的探讨不同构建方向对选择性激光熔融(selective laser melting,SLM)法打印Ti-6Al-4V卡环的物理性能的影响,为临床3D打印高精密度及力学性能优良的卡环提供依据。方法以SLM法分别按0度(SLM0组)、45度(SLM45组)、90度(SLM90组)3种不同构建方向打印Ti-6Al-4V卡环,每组12个;以铸造法铸造卡环12个为对照组;同时铸造4枚金属基牙随机作为上述4组卡环的基牙。用X射线探查各组卡环是否存在裂隙;以共聚焦显微镜检测各组卡环粗糙度、体式显微镜观测各组卡环与金属基牙的密合度;金相显微镜下观察各组样品的显微结构,评估各组试件的物理性能。结果铸造组卡环存在0～8个肉眼可见的裂隙,而SLM组未见明显缺陷。4组中,表面粗糙度最大的是铸造组(18.102±3.762)μm(P <0.05),粗糙度最小的是SLM90组(5.942±1.486)μm(P <0.05),SLM0组(8.711±2.378)μm和SLM45组(8.513±1.161)μm间差异没有统计学意义(P> 0.05)。密合度最差的是铸造组(68.445±14.876)(P <0.05),密合度最好的是SLM90组(33.417±5.880)μm(P <0.05),SLM0组(52.917±12.102)μm和SLM45组(50.889±7.011)μm之间差异没有统计学意义(P> 0.05)。Ti-6Al-4V由α+β晶粒组成,其中β晶粒的生长方向大致平行于构建方向且位于α晶粒之间。SLM由细小的晶粒组成,而铸造组晶粒粗大。结论 SLM试件具有更小的晶粒;SLM90组卡环具有较好的密合性和较光滑的内表面。Objective To investigate the physical properties of Ti-6Al-4V clasps generated by selective laser melting(SLM)with different construction directions and to compare these clasps with cast clasps,which could provide a basis for fabricating SLM clasps with high precision and excellent mechanical properties.Methods Ti-6Al-4V clasps were fabricated by SLM at 0 degrees(SLM0 group),45 degrees(SLM45 group)and 90 degrees(SLM90 group)(n=12).Twelve clasps were cast by the casting method as the control group.Meanwhile,four metal abutments were cast randomly as the abutments of the four groups.X-ray was used to detect cracks in the clasps of each group.The roughness of the clasps was measured by confocal microscopy,the fitness tests between clasps and abutment were processed by stereomicroscopy,and the microstructure of clasps in each group was observed under a metallographic microscope to evaluate the physical properties.Results There were 0-8 visible cracks in the casting group but no obvious defects in the SLM groups.The maximum surface roughness was observed in the cast group(18.102±3.762)μm,while the minimum roughness was observed in the SLM90 group(5.942±1.486)μm(P<0.05).There was no statistically significant difference in surface roughness between the SLM0 group[(8.711±2.378)μm]and the SLM45 group[(8.513±1.161)μm].Fitness was worst in the casting group[(68.445±14.876)μm]and best in the SLM90 group[(33.417±5.880)μm](P<0.05).There was no statistically significant difference in fitness between the SLM0 group[(52.917±12.102)μm]and the SLM45 group[(50.889±7.011)μm].In addition,the growth direction of theβgrains was roughly parallel to the build direction,and acicularαgrains were present betweenβgrains.SLM was composed of fine grains,while the cast group had large grains.Conclusions Specimens generated by SLM had finer grains than cast specimens.In addition,SLM90 clasps had the highest fitness and the lowest surface roughness.

关 键 词：激光选区融化 Ti-6Al-4V卡环 不同构建方向 各向异性 金相 

分 类 号：R783[医药卫生—口腔医学]