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Fatigue behavior and modeling of additively manufactured IN718: The effect of surface treatments and surface measurement techniques
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2021-12-31 , DOI: 10.1016/j.jmatprotec.2021.117475
Seungjong Lee 1, 2 , Shuai Shao 1, 2 , Douglas N. Wells 3 , Miroslav Zetek 4 , Miloslav Kepka 4 , Nima Shamsaei 1, 2
Affiliation  

In this study, the effect of various surface treatments, including sand-blasting, drag-finishing, turning, grinding, and grinding + drag-finishing, on surface roughness and fatigue properties of laser beam powder bed fused Inconel 718 was examined. The surface roughness values obtained from two surface measurement techniques, i.e., optical microscopy and X-ray computed tomography, were compared. Both surface measurement techniques consistently indicated that all surface treatments led to improvements in surface roughness, although optical microscopy was influenced by surface glares and overestimated the surface roughness values of drag-finished specimens. Accordingly, all surface treatments also led to improvement in fatigue resistance with sand-blasting and drag-finishing yielding the least while grinding + drag-finishing causing the most. Notably, only the cracks of grinding + drag-finished specimens initiated from crystallographic facets while those in other conditions were surface initiated. Furthermore, by treating the surface valleys as micro notches, an effective fatigue notch factor model using a hybrid surface roughness metric that incorporates several standard surface roughness parameters was shown to correlate the fatigue lives of 94 % of specimens with various surface conditions within a scatter band of three.



中文翻译:

增材制造 IN718 的疲劳行为和建模:表面处理和表面测量技术的影响

在这项研究中,研究了各种表面处理,包括喷砂、拖精加工、车削、磨削和磨削+拖精加工,对激光束粉末床熔融 Inconel 718 表面粗糙度和疲劳性能的影响。比较了从两种表面测量技术(即光学显微镜和 X 射线计算机断层扫描)获得的表面粗糙度值。两种表面测量技术一致表明,所有表面处理都可以改善表面粗糙度,尽管光学显微镜受到表面眩光的影响,并且高估了拖曳完成的样品的表面粗糙度值。因此,所有表面处理也导致疲劳抗力的提高,其中喷砂和拖曳精加工产生的影响最小,而磨削+拖曳精加工产生的影响最大。值得注意的是,只有磨削+拖曳完成的试样的裂纹是从结晶面开始的,而其他条件下的裂纹是表面引发的。此外,通过将表面凹槽视为微凹槽,使用混合表面粗糙度度量的有效疲劳凹槽因子模型显示了将 94% 的样本的疲劳寿命与散射带内的各种表面条件相关联三个。

更新日期:2022-01-21
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