选择性激光熔化
材料科学
喷丸
残余应力
激光喷丸
激光器
休克(循环)
航空航天
极限抗拉强度
复合材料
光学
微观结构
航空航天工程
物理
内科学
工程类
医学
作者
Nikola Kalentics,Éric Boillat,Patrice Peyre,Cyril Gorny,Christoph Kenel,Christian Leinenbach,Jamasp Jhabvala,Thierry Coupez
标识
DOI:10.1016/j.matdes.2017.05.083
摘要
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.
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