Selective laser melting (SLM) technology used for the design and production of porous implants can successfully address the issues of stress shielding and aseptic loosening associated with the use of solid implants in the human body. In this paper, orthogonal experiments were used to optimize the process parameters for SLM molding of Ti-6Al-4V (TC4) material to investigate the effects of the process parameters on the densities, microscopic morphology, and roughness, and to determine the optimal process parameters using the roughness as a judging criterion. Based on the optimized process parameters, the mechanical properties of SLM-formed TC4 alloy specimens are investigated experimentally in this paper. The main conclusions are as follows: the optimal combination of roughness is obtained by polar analysis, the microhardness of SLM-molded TC4 alloy molded specimens is more uniform, the microhardness of specimens on the side and the front as well as the abrasion resistance is higher than that of casting specimens, the yield strength and tensile strength of specimens is higher than that of ASTM F136 standard and casting standard but the elongation is not as good as that of the standard, and the elasticity and compressive strength of porous specimens are higher than that of casting specimens at different volume fractions. The modulus of elasticity and compressive strength are within the range of human skeletal requirements. This work makes it possible to fabricate high-performance porous femoral joint implants from TC4 alloy SLM-molded materials.

中文翻译：

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使用选择性激光熔化 (SLM) 方法对 Ti-6Al-4V 股骨植入物性能进行实验研究

用于设计和生产多孔植入物的选择性激光熔化（SLM）技术可以成功解决与在人体中使用固体植入物相关的应力屏蔽和无菌松动问题。本文采用正交实验对Ti-6Al-4V（TC4）材料SLM成型工艺参数进行优化，研究工艺参数对密度、显微形貌和粗糙度的影响，确定最佳工艺。以粗糙度作为判断标准的参数。基于优化的工艺参数，本文对SLM成型TC4合金试件的力学性能进行了实验研究。主要结论如下：通过极性分析得到了最优的粗糙度组合，SLM成型的TC4合金成型试件的显微硬度更加均匀，试件侧面和正面的显微硬度以及耐磨性更高。与铸造试样相比，试样的屈服强度和抗拉强度高于ASTM F136标准和铸造标准，但延伸率不如标准，多孔试样的弹性和压缩强度高于标准不同体积分数的铸造样品。弹性模量和抗压强度均在人体骨骼要求范围内。这项工作使得用 TC4 合金 SLM 模制材料制造高性能多孔股骨关节植入物成为可能。