Experimental investigation on the fatigue behavior of laser powder bed fused 316L stainless steel

材料科学 极限抗拉强度 多孔性 融合 背景(考古学) 各向异性 疲劳极限 制作 复合材料 断裂(地质) 光学 物理 生物 哲学 病理 古生物学 医学 替代医学 语言学
作者
Gennaro Salvatore Ponticelli,Riccardo Panciroli,Simone Venettacci,Flaviana Tagliaferri,Stefano Guarino
出处
期刊:Cirp Journal of Manufacturing Science and Technology [Elsevier BV]
卷期号:38: 787-800 被引量:22
标识
DOI:10.1016/j.cirpj.2022.07.007
摘要

Additive manufacturing of metal powder materials through Laser Powder Bed Fusion (LPBF) allows for a single-step fabrication process of complex geometries. However, the introduction of such an innovative technology opens new questions about the fatigue life of functional components especially intended for applications where the products are subjected to severe time-varying loading conditions. In this context, the present work aims at evaluating the fatigue strength of 316L stainless steel samples fabricated through laser powder bed fusion by controlling the building orientation and the volumetric energy density. The work at first presents the response of the LPBF fabricated samples to a monotonic tensile load for varying building orientations. It follows the presentation of their fatigue response to a reverse bending loading condition. Quasi-static tensile tests show that LPBF specimens have lower elastic modulus but higher ultimate and yield strength than the original bulk material, whereby the results evidence a strong anisotropy related to the building orientation. Porosity and building orientation are found to strongly affect the fatigue behavior, with the fatigue limit which lowers from 50% of the ultimate strength of the bulk material down to 20% for the LPBF-ed specimens. Finally, the observation of the failure surfaces suggests that the early fracture of the samples is due to the concomitant initiations of cracks at different sites that eventually coalesce and promote the failure. • Low-cycle fatigue limit of 316L LPBF-ed samples is similar to the bulk material. • Fatigue limit at high-cycle regime lowers to 20% of the ultimate strength. • Fatigue life of LPBF-ed specimens is affected by porosity and building orientation. • Perpendicular layers to the applied load offer the highest fatigue resistance. • Various cracks initiate together at different sites and coalesce promoting failure.
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