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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Laser induced melt pool formation in titanium surface: influence of laser scanning speed
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Laser induced melt pool formation in titanium surface: influence of laser scanning speed

机译：钛表面激光诱导的熔池形成：激光扫描速度的影响

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Purpose - A model study of laser heating process including phase change and molten flow in the melt pool gives physical insight into the process and provides useful information on the influence of melting parameters. In addition, the predictions reduce the experimental cost and minimize the experimental time. Consequently, investigation into laser control melting of the titanium alloy becomes essential. The purpose of this paper is to do this. Design/methodology/approach - Laser repetitive pulse heating of titanium surface is investigated and temperature field as well as Marangoni flow in the melt pool is predicted using finite volume approach. The influence of laser scanning speed and laser pulse parameter (defining the laser pulse intensity distribution at the workpiece surface) on temperature distribution and melt size is examined. The experiment is carried out to validate temperature predictions for two consecutive laser pulses. Findings - The influence of laser scanning speed is significant on the melt pool geometry, which is more pronounced for the laser pulse parameter 3 = 0. Temperature predictions agree with the thermocouple data obtained from the experiment. Research limitations/implications - Although temperature dependent properties are used in the simulations, isotropy in properties may limit the simulations. The laser canning speed is limited to 0.3 m/s, which is good for surface treatment process, but it may slow for annealing treatments. Practical implications - The results are very useful to capture insight into the melting process. In addition, the influence of laser scanning speed and laser pulse intensity distribution on the melt formation in the surface vicinity is well presented, which will be useful for those working on laser surface treatment process. Originality/value - The work is original and findings are new, which demonstrate the influence of laser parameters on the melt pool formation and resulting Marangoni flow.
机译：目的-对激光加热过程的模型研究，包括相变和熔池中的熔体流动，可以从物理上洞悉该过程，并提供有关熔解参数影响的有用信息。另外，这些预测降低了实验成本并最小化了实验时间。因此，研究钛合金的激光控制熔化变得至关重要。本文的目的就是要做到这一点。设计/方法/方法-研究了钛表面的激光重复脉冲加热，并使用有限体积方法预测了熔池中的温度场以及Marangoni流。研究了激光扫描速度和激光脉冲参数（定义工件表面的激光脉冲强度分布）对温度分布和熔体尺寸的影响。进行实验以验证两个连续激光脉冲的温度预测。发现-激光扫描速度对熔池几何形状的影响很大，对于激光脉冲参数3 = 0更为明显。温度预测与从实验中获得的热电偶数据一致。研究的局限性/意义-尽管在仿真中使用了温度相关的属性，但是属性的各向同性可能会限制仿真。激光装罐速度限制为0.3 m / s，这对表面处理过程是有利的，但对于退火处理可能会减慢。实际意义-结果对于了解熔解过程非常有用。此外，很好地介绍了激光扫描速度和激光脉冲强度分布对表面附近熔体形成的影响，这对于从事激光表面处理工艺的人员将是有用的。原创性/价值-这项工作是原创的，发现是新的，这些结果证明了激光参数对熔池形成和所产生的Marangoni流的影响。

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