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Direct Laser Metal Deposition of Eutectic Al-Si Alloy for Automotive Applications

机译：汽车应用共晶Al-Si合金的直接激光金属沉积

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摘要

Various additive manufacturing techniques have been able to manufacture Al-Si hypo- and hyper-eutectic alloys but practical implementation of additive manufacturing of Al-Si alloys in automotive industry still remains a big challenge. This paper deals with the challenges of building tall wall and cuboid shapes eutectic Al-Si components by direct laser metal deposition technique for automotive applications. Microstructural investigation using optical and scanning electron microscopy revealed a 99.9% dense component with very fine hypoeutectic microstructure. Tensile test showed an impressive elongation of 9% with an ultimate tensile strength of 225 MPa. This investigation revealed that direct laser metal deposition could be successfully implemented on automotive shock tower hood without any distortion or bending. This paper also presents the effect of various laser deposition parameters like laser power, powder flow rate, and scanning speed on the microstructure and mechanical properties distribution from substrate to deposit.
机译：各种增材制造技术已经能够制造Al-Si亚共晶和过共晶合金，但是在汽车工业中实际实施Al-Si合金的增材制造仍然是一个巨大的挑战。本文探讨了通过直接激光金属沉积技术在汽车应用中建造高壁和长方体共晶Al-Si组件的挑战。使用光学和扫描电子显微镜的显微结构研究表明，99.9％的致密成分具有非常好的亚共晶微观结构。拉伸试验显示出令人印象深刻的伸长率为9％，极限抗拉强度为225 MPa。这项调查表明，可以直接在汽车减震塔机罩上成功进行直接激光金属沉积，而不会发生任何变形或弯曲。本文还介绍了各种激光沉积参数，例如激光功率，粉末流速和扫描速度，对从基体到沉积物的微观结构和力学性能分布的影响。

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