摘要
为了优化激光选区熔化技术制备生物医用Ti-15Mo合金的工艺参数,利用光学显微镜、X射线衍射仪、扫描电子显微镜、万能试验机、电化学工作站等设备系统研究了激光工艺参数对试样的相对密度、微观组织、力学性能以及耐腐蚀性能的影响。结果表明:随着激光能量密度的升高,Ti-15Mo合金的相对密度呈先逐渐增大而后趋于平稳的趋势;试样沿垂直方向为等轴晶而沿平行于沉积方向为柱状晶,物相组成为bcc结构的单一β相;试样的力学性能与相对密度呈正相关。当激光功率为175 W、扫描速度为1500 mm/s、扫描间距为80μm时,试样的相对密度达99.84%,综合性能最佳:极限抗拉强度、延伸率、弹性模量分别为801.0 MPa、24.0%、90.6 GPa;试样的腐蚀电流密度为0.059μA/cm2,腐蚀速率为0.05μm/a,满足生物医用植入物材料要求。
To optimize the process parameters for fabricating biomedical Ti-15Mo alloy via selective laser melting(SLM),this work systemati-cally investigated the effects of laser processing parameters on the relative density,microstructure,mechanical properties,and corrosion resist-ance of specimens by optical microscopy(OM),X-ray diffraction(XRD),scanning electron microscopy(SEM),universal testing machines and electrochemical workstations.Results showed that with increasing laser energy density,the relative density of Ti-15Mo alloy first progres-sively increased and then stabilized.The specimens exhibited equiaxed grains along the vertical direction and columnar grains parallel to the deposition direction,with a singleβ-phase of bcc structure constituting the phase composition.In addition,the mechanical properties of the specimens showed a positive correlation with their relative density.When the laser power was 175 W,the scanning speed was 1500 mm/s,and the scanning spacing was 80μm,the relative density of the as-prepared specimen reached 99.84%,and the comprehensive performance was the best.The specimens exhibited the ultimate tensile strength of 801.0 MPa,the elongation of 24.0%and the elastic modulus of 90.6 GPa.Moreover,the specimen demonstrated excellent corrosion resistance with a current density of 0.059μA/cm2 and corrosion rate of 0.05μm/a,meeting the stringent requirements for biomedical implant materials.
作者
朱红梅
沈少凡
王云飞
潘存良
罗浩
ZHU Hongmei;SHEN Shaofan;WANG Yunfei;PAN Cunliang;LUO Hao(Hunan Key Laboratory of Equipment Safety Service Technology in Supernormal Environment,Nanhua University,Hengyang 421001,China;School of 3D Printing,Xinxiang University,Xinxiang 453003,China)
出处
《材料保护》
2025年第5期72-81,共10页
Materials Protection
基金
国家自然科学基金(52375341)
河南省高等学校重点科研项目(25A430037)~~。
关键词
激光选区熔化
Ti-15Mo合金
微观组织
力学性能
耐蚀性能
selective laser melting(SLM)
Ti-15Mo alloys
microstructure
mechanical properties
corrosion resistance
