Effects of Processing Parameters on Surface Roughness of Additive Manufactured Ti-6Al-4V via Electron Beam Melting.
Effects of Processing Parameters on Surface Roughness of Additive Manufactured Ti-6Al-4V via Electron Beam Melting.
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DOI：
10.3390/ma10101121
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发表时间：
2017-09-22
期刊：
影响因子：
--
通讯作者：
Wei J
中科院分区：
文献类型：
--
作者：
Wang P;Sin WJ;Nai MLS;Wei J
作为粉末床熔融增材制造技术之一，电子束熔化（EBM）因其近净成形生产能力、低残余应力和良好的力学性能而受到越来越多的关注。这些特性还使得 EBM 制造的零件可以直接使用，无需进行后处理。然而，竣工时的粗糙表面会对金属合金的机械性能产生不利影响。此后，了解加工参数对零件表面粗糙度的影响就变得至关重要。本文重点讨论了 EBM 中两种轮廓扫描策略（即多点和非多点）的处理参数的变化。结果表明，束流和速度函数是非多点轮廓扫描策略最重要的处理参数。而对于多点轮廓扫描策略，光点数量、光点时间和光点重叠比焦点偏移和束流的影响更大。两种轮廓扫描策略均获得了改进的表面粗糙度。此外，在优化条件下，与多点对应的非多点轮廓扫描策略相比，非多点轮廓扫描策略具有较低的表面粗糙度值和较差的几何精度。这些发现可用作选择用于使用 EBM 制造的特定工业零件的轮廓类型的指南。
As one of the powder bed fusion additive manufacturing technologies, electron beam melting (EBM) is gaining more and more attention due to its near-net-shape production capacity with low residual stress and good mechanical properties. These characteristics also allow EBM built parts to be used as produced without post-processing. However, the as-built rough surface introduces a detrimental influence on the mechanical properties of metallic alloys. Thereafter, understanding the effects of processing parameters on the part’s surface roughness, in turn, becomes critical. This paper has focused on varying the processing parameters of two types of contouring scanning strategies namely, multispot and non-multispot, in EBM. The results suggest that the beam current and speed function are the most significant processing parameters for non-multispot contouring scanning strategy. While for multispot contouring scanning strategy, the number of spots, spot time, and spot overlap have greater effects than focus offset and beam current. The improved surface roughness has been obtained in both contouring scanning strategies. Furthermore, non-multispot contouring scanning strategy gives a lower surface roughness value and poorer geometrical accuracy than the multispot counterpart under the optimized conditions. These findings could be used as a guideline for selecting the contouring type used for specific industrial parts that are built using EBM.
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