The influence of laser and powder defocusing characteristics on the surface quality in laser direct metal deposition
The influence of laser and powder defocusing characteristics on the surface quality in laser direct metal deposition
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DOI：
10.1016/j.optlastec.2011.07.013
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发表时间：
2012-03
影响因子：
5
通讯作者：
G. Zhu;Dichen Li;A. Zhang;Gang Pi;Yiping Tang
中科院分区：
文献类型：
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作者：
G. Zhu;Dichen Li;A. Zhang;Gang Pi;Yiping Tang
为了研究激光直接金属沉积中粉末和激光离焦量的变化对表面质量的影响规律，获得表面光滑的零件，在3种不同粉末离焦量和3种不同激光离焦量条件下制备了薄壁金属零件。实验结果表明，粉末聚焦在基体下方，激光聚焦在基体上方的工艺可获得较高的表面质量，粉末聚焦从熔池上方移到下方的变化对表面质量的影响起主导作用，激光聚焦从熔池上方移到下方的变化起辅助作用。为了解释实验结果，建立了一个简单的轨道高度模型。
To investigate the influencing rules of the variations of powder and laser defocusing distance on surface quality and obtain the smooth surface of parts in laser direct metal deposition, the thin-walled metal parts were fabricated under three different powder defocusing distances and three different laser defocusing distances conditions. The experimental results show that a high surface quality can be obtained with the powder focussed below the substrate and laser focussed above the substrate process, and the variation in which the powder focus moves from above to below the melt pool plays a leading role and the variation in which the laser focus moves from above to below the melt pool plays a supplementary role in the influence on the surface quality. To explain the experimental results, a simple model of the track height is established.