Distortion mitigation in additive manufacturing of AlSi10Mg by multilayer laser peening
Distortion mitigation in additive manufacturing of AlSi10Mg by multilayer laser peening
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DOI：
10.1016/j.procir.2020.01.179
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
G. Madireddy;J. F. Liu;M. Sealy
中科院分区：
文献类型：
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作者：
G. Madireddy;J. F. Liu;M. Sealy
金属增材制造中的变形仍然是一个行业障碍，这是由于热管理不足而导致的残余应力。缓解策略主要涉及基于构建材料开发打印配方;然而，机器平台、构建策略和原材料库存之间的可变性抑制了消除失真的通用打印配方的开发。需要一种能够实现无变形增材制造的通用制造技术。提供独立于机器平台和构建策略的无变形部件的解决方案是将增材制造与多层喷丸结合。喷丸能够使残余应力有利地重新分布，残余应力使用机械手段而不是热管理来驱动变形。在逐层喷丸过程中残余应力的累积性质和复合效应对变形的影响知之甚少。因此，这项工作的研究目标是测量多层激光喷丸后的残余应力和变形的AlSi 10 Mg打印激光粉末床融合的松浦Lumex Avance-25。残余应力测定了几个层间喷丸频率。确定了最佳条件，并进行了评估，以减轻失真。为了测量挠度，打印了基于NIST AMB 2018 -01的桥梁样本，并进行了层间喷丸处理。结果表明，激光喷丸减少失真45%以上的印刷样品。
Distortion in metal additive manufacturing remains an industry barrier due to the inadequate thermal management that gives rise to residual stresses. Mitigation strategies primarily involve developing a print recipe based on the build material; however, variability among machine platforms, build strategies, and raw material stock inhibit development of universal print recipes that eliminate distortion. There is a need for a universal manufacturing technology that enables distortion free additive manufacturing. A solution to provide distortion free parts that are machine platform and build strategy independent is coupling additive manufacturing with multilayer peening. Peening enables favorable redistribution of residual stresses that drive distortion using mechanical means rather than thermal management. The cumulative nature of residual stress during layer-by-layer peening and the compounding effect on distortion is poorly understood. Thus, the research objective of this work was to measure residual stress and distortion after multilayer laser peening on AlSi10Mg printed by laser powder bed fusion on the Matsuura Lumex Avance-25. Residual stress was measured for several interlayer peening frequencies. An optimum condition was identified and evaluated for distortion mitigation. To measure deflection, bridge samples based on NIST AMB2018-01 were printed and interlayer peened. Results indicated that laser peening reduced distortion 45% over an as-printed sample.