CO2 laser polishing of laser-powder bed fusion produced AlSi10Mg parts
CO2 laser polishing of laser-powder bed fusion produced AlSi10Mg parts
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DOI：
10.1016/j.surfcoat.2021.127291
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发表时间：
2021-05-18
影响因子：
5.4
通讯作者：
Brabazon, Dermot
中科院分区：
文献类型：
--
作者：
El Hassanin, Andrea;Obeidi, Muhannad Ahmed;Brabazon, Dermot
表面质量差是金属增材制造零件需要改进的一个重要问题。短波长或长波长激光器都已用于表面抛光，以改善表面光洁度。在这项工作中，可能使用的CO2激光的AlSi 10 Mg零件的激光基粉末床熔融（L-PBF）的表面抛光进行了探索。在建成条件下的高表面粗糙度可导致增加的激光能量吸收。为了评估与激光相关的主要工艺参数的影响，在相对于构建平台垂直构建的L-PBF样品上进行实验。通过共聚焦显微镜获得的表面算术平均高度（S-a）、表面偏斜度（S-sk）和原始轮廓均方根斜率（P-dq）来评价它们对表面的影响。通过SEM和EDS分析研究了显微组织的演变过程。结果表明，表面粗糙度大幅降低，范围从67%到85%的起始值。重熔层的显微组织显示出增加的晶粒尺寸和增加的Si含量，这导致总硬度从85 HV增加到121 HV。
Y Poor surface quality represents an important issue that needs improvement for metal Additively Manufactured parts. Both short or long wavelength lasers have been applied for surface polishing in order to improve the surface finish. In this work, the possible use of a CO2 laser for the surface polishing of AlSi10Mg parts made by Laser-based Powder Bed Fusion (L-PBF) was explored. The high surface roughness in the as-built condition can lead to increased laser energy absorption. In order to assess the effects of the main laser-related process parameters, the experiments were carried out on L-PBF samples built vertically with respect to the build platform. Their effect on the surface were evaluated by means of the surface arithmetical mean height (S-a), surface skewness (S-sk) and primary profile root mean square slope (P-dq), obtained via confocal microscopy. Microstructure evolution was also investigated by means of SEM and EDS analysis. The results showed a large reduction in surface roughness, ranging from the 67% to the 85% of the starting value. Microstructure of the remolten layer revealed an increased grain size and an increased Si content that led to an overall hardness increase from 85 to 121 HV.