选区激光熔化体心立方多孔结构的各向异性

发布时间：2018-05-12 10:31

本文选题：激光技术 + 多孔结构　；参考：《中国激光》2017年08期

【摘要】：使用选区激光熔化(SLM)技术制备了Ti6Al4V钛合金体心立方多孔结构,分别研究了线能量密度和微杆直径对体心立方多孔结构成形方向(Z向)和非成形方向(X/Y向)压缩性能的影响。结果表明,采用SLM技术成形的体心立方多孔结构存在明显的各向异性。随着线能量密度的下降,体心立方多孔结构的抗压强度先增大后减小,其各向异性程度在最优参数下达到最低。随着微杆直径的减小,体心立方多孔结构的各向异性程度逐步降低;当微杆直径降至0.4mm时,各向异性程度仅为3%左右。研究表明,即使是各向同性的多孔结构,采用SLM技术成形后,也会表现出明显的各向异性;这种各向异性与成形质量和层间界面有关,通过调整工艺参数及修改模型特征尺寸可以在一定程度上减弱这种各向异性。
[Abstract]:Ti6Al4V titanium alloy bulk centered cubic porous structure was prepared by selective laser melting (SLM) technique. The effects of linear energy density and microbar diameter on the compression properties of bulk centered cubic porous structure forming direction Z) and non forming direction X / Y) were studied respectively. The results show that the bulk centered cubic porous structure fabricated by SLM technique has obvious anisotropy. With the decrease of linear energy density, the compressive strength of bulk centered cubic porous structures increases first and then decreases, and the anisotropy reaches the lowest at the optimal parameters. With the decrease of microrod diameter, the anisotropy of bulk centered cubic porous structure decreases gradually, and when the diameter of microbar decreases to 0.4mm, the anisotropy degree is only about 3%. It is shown that even the isotropic porous structure will exhibit obvious anisotropy after forming by SLM technique, which is related to the forming quality and interlayer interface. The anisotropy can be reduced to a certain extent by adjusting the process parameters and modifying the characteristic dimensions of the model.
【作者单位】：西安交通大学机械制造系统工程国家重点实验室;陕西恒通智能机器有限公司;
【基金】：国家重点研发计划(2016YFC1100500)
【分类号】：TG665

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