人工植入缺陷对增材制造TC4钛合金性能的影响规律  

Influence of artificial implant defects on properties of TC4 Titanium alloy fabricated by additive manufacturing

作　　者：王继航 蔡雨升 姜沐池 任德春 吉海宾[2] 雷家峰[2] 肖旋[1] WANG Jihang;CAI Yusheng;JIANG Muchi;REN Dechun;JI Haibin;LEI Jiafeng;XIAO Xuan(Material Science and Engineering School,Shenyang Ligong University,Shenyang 110159,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110159 [2]中国科学院金属研究所,沈阳110016

出　　处：《有色金属科学与工程》2023年第5期668-675,共8页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(51504154)。

摘　　要：采用激光选区熔化(Selective Laser Melting,SLM)的增材制造成形技术制备内含人工设计缺陷的TC4钛合金样品,研究了预埋缺陷的尺寸、位置对成形合金室温拉伸性能的影响规律。结果表明:由于SLM成形过程人工植入缺陷内包含的合金粉末无法排出热处理后在孔洞缺陷表面烧结,导致缺陷实际尺寸较设计尺寸略小。当预埋缺陷直径小于0.7 mm时,合金抗拉强度基本保持不变,试样均从非预埋缺陷区断裂;当预埋缺陷直径超过0.7 mm后,抗拉强度随缺陷尺寸增大而显著降低,试样均从预埋缺陷区断裂。合金延伸率受缺陷的影响较为显著,随着缺陷尺寸的增大,延伸率整体呈现逐渐降低的趋势,当缺陷尺寸超过0.7 mm后,延伸率急剧降低,缺陷尺寸超过0.9 mm后,延伸率在2%~4%范围内波动。缺陷尺寸超过0.7 mm后,缺陷尺寸是影响增材制造合金强度和延伸率的主导因素。TC4 titanium alloy samples with artificial implant defects were prepared by Selective Laser Melting(SLM)for one of the additive manufacturing technologies.The effects of the size and location of artificial implant defects on the tensile properties of the fabricated alloy at room temperature were studied,respectively.The results show that the actual size of the defects is slightly smaller than the designed size due to the alloy powder contained in the SLM fabrication process not being discharged but sintered on the hole defect surface after heat treatment.When the embedded defect diameter is less than 0.7 mm,the tensile strength of the alloy remains unchanged,and the samples all break from the non-embedded defect area.When the diameter of the embedded defect exceeds 0.7 mm,the tensile strength significantly decreases with the increase in defect size,and the samples all break from the embedded defect area.Alloy elongation is significantly affected by defects.With the increase in defect size,the overall elongation shows a trend of gradual decrease.When the defect size exceeds 0.7 mm,the elongation decreases sharply.When the defect size exceeds 0.9 mm,the elongation fluctuates in the range of 2%—4%.When the defect size is more than 0.7 mm,defect size is the dominant factor affecting the strength and elongation of addictive manufacturing alloy.

关 键 词：激光选区熔化 TC4钛合金 孔洞缺陷 力学性能 

分 类 号：TU146.23[建筑科学—建筑理论]