激光粉末床熔合SS316L粉末流动性的数值模拟

A. Bouabbou, S. Vaudreuil
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引用次数: 2

摘要

本工作旨在通过数值模拟和原位实验对金属粉末流动性有更深入的了解,从而改进激光粉末床熔融增材制造的粉末床扩散过程。采用离散元法(DEM)研究了粉末的流动性及其内在特性。基于改进的Beverloo定律,建立了一个高保真的粒子尺度模型来捕捉虚拟霍尔流量计中金属粒子相互作用的动力学。利用霍尔流静态粉末表征技术对实验结果进行了验证。对于霍尔值为29s/50g、休止角(AOR)为32的SS316L粉末合金,在滚动系数和滑动系数均为0.5的情况下,模拟的霍尔值为28.55s/50g,模拟的流量为0.571 g/s,通过模拟粉末的AOR验证了这一点[31.2-32.6]。然而,滚动摩擦对质量流量的影响很小,但增加了休止角。滑动摩擦显著降低了质量流量,增加了AOR。DEM是研究流动性的理想方法。然而,模拟粒子的数量和模拟时间步长对计算能力有一定的限制。未来的研究可能涉及研究其他动态流动性表征技术。通过对粉末流动性进行建模,可以更好地理解粉末颗粒在微观尺度上的流动。这导致模拟一个更真实的粉末床和改善粉末扩散过程,导致更好的增材制造零件质量。本文提供了一种独特的方法来模拟SS316L粉末的流动性,使用基于贝弗鲁定律的霍尔流量计设计。这将改善金属3D打印所需的扩散过程的建模。
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Numerical modelling of SS316L powder flowability for laser powder-bed fusion
This work aims to improve the powder-bed spreading process for laser powder bed fusion additive manufacturing by gaining a greater understanding of metal powder flowability through numerical modelling and in-situ experimentation.Using the Discrete Element Method (DEM) to study the flowability of the powder and its intrinsic properties. A high-fidelity particle-scale model was developed to capture the dynamics of metal particle interactions in a virtual Hall flow meter based on a modified Beverloo law. The results are validated experimentally using the Hall flow static powder characterisation technique.For SS316L powder alloy with the hall-value of 29s/50g and with an angle of repose (AOR) of 32, the modelled powder that exhibited the same flow behaviour was found using 0.5 for both rolling and sliding coefficients resulting in simulated Hall value of 28.55s/50g with a simulated flow rate of 0.571 g/s, which is validated by AOR of the simulated powder [31.2-32.6]. However, rolling friction had minimal effect on the mass flow rate but increased the angle of repose. Sliding friction significantly decreased the mass flow rate and increased AOR.DEM is an ideal method to study flowability. However, there are certain constraints imposed on the computational power by a number of simulated particles and simulation time-step. Future research may involve investigating other dynamic flowability characterisation techniques.Enabling a better understanding of powder particle flow at a micro-scale by modelling powder flowability. This leads to simulating a more realistic powder bed and improving the powder spreading process, leading to better AM parts quality.This paper provides a unique approach for modelling the flowability of SS316L powder using a Beverloo law-based design of the Hall flow meter. This will improve the modelling of the spreading process needed for metal 3D printing.
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来源期刊
Archives of materials science and engineering
Archives of materials science and engineering Materials Science-Materials Science (all)
CiteScore
2.90
自引率
0.00%
发文量
15
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