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首页> 美国卫生研究院文献>Materials >Effects of Processing Parameters on Surface Roughness of Additive Manufactured Ti-6Al-4V via Electron Beam Melting
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Effects of Processing Parameters on Surface Roughness of Additive Manufactured Ti-6Al-4V via Electron Beam Melting

机译：工艺参数对通过电子束熔化法制备的Ti-6Al-4V添加剂表面粗糙度的影响

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摘要

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.
机译：作为粉末床熔融增材制造技术之一，电子束熔炼（EBM）由于其近净形的生产能力，低残余应力和良好的机械性能而受到越来越多的关注。这些特性还使EBM内置零件可以直接使用，而无需进行后处理。但是，建成后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。本文着重于改变EBM中两种轮廓扫描策略的处理参数，即多点和非多点。结果表明，束流和速度函数是非多点轮廓扫描策略的最重要的处理参数。对于多光点轮廓扫描策略，光点数量，光点时间和光点重叠比聚焦偏移和电子束电流具有更大的影响。在两种轮廓扫描策略中均获得了改善的表面粗糙度。此外，在优化条件下，非多点轮廓扫描策略比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。这些发现可作为选择使用EBM构建的特定工业零件所使用的轮廓类型的指南。

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