Atmospheric Pressure高温下选择性熔化Atmospheric Pressure的实验研究
A Testbed for Investigation of Selective Laser Melting at Elevated Atmospheric Pressure
摘要：
通过激光粉末床熔合（L-PBF）的金属增材制造（AM）建立在激光焊接领域中建立的基础之上，包括气体和羽流动力学对焊接深度和质量的影响。L-PBF要求对激光与金属粉末床相互作用时发生的复杂热物理现象进行彻底的研究。特别地，熔池湍流和蒸发受到环境气体化学和压力的影响。本文介绍了高压激光熔化（HPLM）试验台的设计和验证，这可容纳裸金属板样品以及手动涂覆的单一粉末层，并在高达300 psig的操作。该试验台的开放式架构允许完全控制所有相关激光参数，以及构建区域的环境气压和气流。为了验证系统性能，对裸板和粉末上的代表性熔体轨迹和光栅进行了检查，初步分析得出结论，压力对熔池纵横比有显着影响。因此，HPLM系统能够仔细研究压力对常见L-PBF材料加工的影响，并且可以在未来应用于在环境压力下具有挑战性的材料，例如具有高蒸气压的材料。
英文摘要：
Metal additive manufacturing (AM) by laser powder bed fusion (L-PBF) builds upon fundamentals established in the field of laser welding which include the influence of gas and plume dynamics on weld depth and quality. L-PBF demands a thorough investigation of the complex thermophysical phenomena that occur where the laser interacts with the metal powder bed. In particular, melt pool turbulence and evaporation are influenced by the ambient gas chemistry and pressure. This paper presents the design and validation of high pressure laser melting (HPLM) testbed; this accommodates bare metal plate samples as well as manually-coated single powder layers, and operates at up to 300 psig. The open architecture of this testbed allows for full control of all relevant laser parameters in addition to ambient gas pressure and gas flow over the build area. Representative melt tracks and rasters on bare plate and powder are examined in order to validate system performance, and preliminary analysis concludes that pressure has a significant impact on melt pool aspect ratio. The HPLM system thus enables careful study pressure effects on processing of common L-PBF materials, and can be applied in the future to materials that are challenging to process under ambient pressure, such as those with high vapor pressures.
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