3D Laser Shock Peening - A new method for the 3D control of residual stresses in Selective Laser Melting
3D Laser Shock Peening - A new method for the 3D control of residual stresses in Selective Laser Melting
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DOI：
10.1016/j.matdes.2017.05.083
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发表时间：
2017-09-15
影响因子：
8.4
通讯作者：
Loge, Roland E.
中科院分区：
文献类型：
--
作者：
Kalentics, Nikola;Boillat, Eric;Loge, Roland E.
本文介绍了一种混合增材制造工艺-三维激光冲击强化（3D LSP），基于激光冲击强化（LSP）与选择性激光熔化（SLM）的集成。SLM部件在表面下区域中的完工（AB）状态中的众所周知的拉伸残余应力（TRS）对其疲劳寿命具有不利影响。LSP是一种相对昂贵的表面后处理方法，已知会在零件的表面下产生较深的CRS，并用于疲劳寿命至关重要的高端应用（例如航空航天、核能）。新提出的3D LSP工艺利用了重复中断零件制造的可能性，具有几个SLM层的循环。这种方法导致在所生产的部件的表面下产生更高和更深的CRS，具有预期的改善的疲劳特性。在本文中，316 L不锈钢样品的3D LSP处理使用解耦的方法，即通过来回移动基板从SLM机器到LSP站。对于所有研究的工艺参数，与AB SLM部件或传统LSP（表面）处理的部件相比，观察到CRS的幅度和深度明显增加。[图形]。
This paper describes a hybrid additive manufacturing process - 3D Laser Shock Peening (3D LSP), based on the integration of Laser Shock Peening (LSP) with selective laser melting (SLM). The well-known tensile residual stresses (TRS) in the as - built (AB) state of SLM parts in the subsurface region have a detrimental effect on their fatigue life. LSP is a relatively expensive surface post treatment method, known to generate deep CRS into the subsurface of the part, and used for high end applications (e.g. aerospace, nuclear) where fatigue life is crucial. The novel proposed 3D LSP process takes advantage of the possibility to repeatedly interrupt the part manufacturing, with cycles of a few SLM layers. This approach leads to higher and deeper CRS in the subsurface of the produced part, with expected improved fatigue properties. In this paper, 316L stainless steel samples were 3D LSP processed using a decoupled approach, i.e. by moving back and forth the baseplate from an SLM machine to an LSP station. A clear and significant increase in the magnitude and depth of CRS was observed, for all investigated process parameters, when compared to the AB SLM parts, or those traditionally LSP (surface) treated.[GRAPHICS].