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首页> 外文期刊>International Journal of Heat and Mass Transfer >Evolution phenomena and surface shrink of the melt pool in an additive manufacturing process under magnetic field
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Evolution phenomena and surface shrink of the melt pool in an additive manufacturing process under magnetic field

机译：磁场作用下增材制造过程中熔池的演变现象和表面收缩

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The control of evolution of flow and heat transfer in melt pool is a key concern and hot topic to improve the produce quality, e.g. fissure and roughness, during the additive manufacture process. Researchers focus on controlling the evolution of melt pool by changing energy balance in melt pool. However, the momentum drive is seldom presented in literatures but fully necessary to further improve the control efficiency. Therefore, a promising magnetic force source is introduced to investigate the controlling effect on melt pool evolution. Based on a developed and validated laser melt pool model, the evolution results of three different magnetic field arrangements and intensities are obtained and analysed compared with that without magnetic force. In addition, the surface shrink characteristics during quenching process are studied to further evaluate the benefit of the added source. Results show that the melt pool evolution is significantly affected by the additional magnetic force. The increasing downward y-component force promotes the transport in melt pool which makes the surface deformation larger, as well as the melt pool dimension. Inversely, with the increase of x-component force, both the surface deformation and the melt pool dimension gradually decrease due to the induced transport limitation. During quenching process, the surface roughness is continuously reduced with a certain increase of the magnetic intensity caused by the increased melt pool duration and slightly vigorous surface flow. However, the improvement effectiveness becomes bad as the magnetic force exceeds a critical value owing to the increased shrink instability. (C) 2018 Elsevier Ltd. All rights reserved.
机译：如何控制熔池中流动和传热的发展是提高产品质量的关键问题和热点。在增材制造过程中出现裂缝和粗糙度。研究人员致力于通过改变熔池中的能量平衡来控制熔池的演变。然而，动量驱动很少在文献中提出，但是对于进一步提高控制效率是完全必要的。因此，引入了有前途的磁力源来研究对熔池演化的控制作用。基于已开发并经过验证的激光熔池模型，获得了三种不同磁场排列和强度的演化结果，并与没有磁力的情况进行了比较。此外，研究了淬火过程中的表面收缩特性，以进一步评估添加源的益处。结果表明，熔池的演化受到附加磁力的显着影响。增大的向下y分量力促进了熔池中的传输，这使表面变形以及熔池尺寸变大。相反，随着x分量力的增加，由于引起的传输限制，表面变形和熔池尺寸均逐渐减小。在淬火过程中，由于增加的熔池持续时间和略微剧烈的表面流动而引起的磁强度的一定增加，使表面粗糙度不断降低。然而，由于增加的收缩不稳定性，当磁力超过临界值时，改善效果变差。 （C）2018 Elsevier Ltd.保留所有权利。

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