Effect of multi-pass shot peening on the microstructure of LPBF AlSi10Mg alloy

P Snopiński, T Yu, X Zhang, D Juul Jensen
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Abstract

In this study, we investigated the effect of multi-pass shot peening (SP) on the microstructural evolution of a Laser Powder Bed Fusion AlSi10Mg alloy. Characterization techniques included optical microscopy, scanning electron microscopy, and electron backscatter diffraction (EBSD). The results revealed that multi-pass SP induces a gradient microstructure with notable alterations in the grain structure extending to a depth of approximately 45 μm. EBSD analysis revealed that the SP treatment induced grain refinement and formation of subgrains (average distances between boundaries vary from 3.6 μm in the un-deformed area to 0.4 μm near the heavily deformed surface area). It is discussed how this refined microstructure following SP may lead to substantial improvements in mechanical properties and fatigue strength, and thus hold promises for increased performance of critical components across various industrial applications.
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多道喷丸强化对 LPBF AlSi10Mg 合金微观结构的影响
在本研究中,我们研究了多道喷丸强化(SP)对激光粉末床熔炼 AlSi10Mg 合金微观结构演变的影响。表征技术包括光学显微镜、扫描电子显微镜和电子反向散射衍射(EBSD)。结果表明,多通道 SP 可诱导出梯度微观结构,晶粒结构的显著变化可延伸至约 45 μm 的深度。EBSD 分析表明,SP 处理诱导了晶粒细化和子晶粒的形成(边界之间的平均距离从未变形区域的 3.6 μm 到严重变形表面区域附近的 0.4 μm)。本文讨论了 SP 精炼后的微观结构如何大幅改善机械性能和疲劳强度,从而有望提高各种工业应用中关键部件的性能。
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