Fatigue properties of titanium alloy custom short stems fabricated by electron beam melting

作     者：Liao Wang Shujun Li Mengning Yan Yubo Cheng Wentao Hou Yiping Wang Songtao Ai Rui Yang Kerong Dai Liao Wang;Shujun Li;Mengning Yan;Yubo Cheng;Wentao Hou;Yiping Wang;Songtao Ai;Rui Yang;Kerong Dai

作者机构：Shanghai Key Laboratory of Orthopaedic ImplantsDepartment of Orthopaedic SurgeryShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai Jiao Tong UniversityShanghai 200030China Titanium Alloy LaboratoryInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China Image Medraw Technology(Shanghai)Company LimitedShanghai 201100China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第52卷第17期

页      面：180-188页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported partially by the Chinese MoST(No.2017YFC1104903) the Key Research Program of Frontier Sciences,CAS(No.QYZDJ-SSW-JSC031-02) the National Natural Science Foundation of China(Nos.81772425,51631007 and 51871220) the Science and Technology Commission of Shanghai Municipality(No.16441908700) the Shanghai Jiao Tong University(No.YG2016MS11)。 

主　　题：Custom short stem Titanium alloy Electron beam melting Fatigue property 

摘      要：The fatigue properties of titanium alloy short-stems with four different lengths,manufactured by electron beam melting(EBM)technology,were investigated by in vitro test and finite element(FE)analysis.FE simulation results indicate that the maximum tensile stress concentrates at the lateral side of the stem body.The magnitude of the concentrated tensile stress increases and the corresponding area of the axial section decreases with increasing of stem length.Results from fatigue tests demonstrate that fatigue cracks mainly initiate from the rough surface of the stem where the maximum tensile stress concentrates.The fatigue strength decreases with the increase of stem length,which is attributed to the higher stress concentration on the longer stem surface.In addition,it is found that post EBM treatment via hot isostatic processing(HIP)is able to enhance the fatigue properties of the stems,since the pores generated during EBM are mostly closed during HIP.Our work also demonstrates that the stress concentration on the stem surface can be effectively mitigated and the corresponding fatigue properties of the EBM-fabricated titanium alloy short stem can be considerably improved by optimizing the design in the stem length.