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Influence of SLM process parameters on the surface finish, porosity rate and fatigue behavior of as-built Inconel 625 parts
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2018-05-01 , DOI: 10.1016/j.jmatprotec.2017.12.043
Imade Koutiri , Etienne Pessard , Patrice Peyre , Ouafae Amlou , Thibaut De Terris

Abstract This paper is dedicated to understanding fatigue crack initiation for an Inconel 625 manufactured by SLM, using a hatching + contour procedure. In the first part of the paper, an optimum set of parameters was found to deliver the best surface roughness combined with low porosity. This process optimization, mostly focused on adjusting the volume energy density aimed at finding a compromise between an optimum densification state and a minimum number of contaminating spatters. Secondly, a fatigue test campaign has been conducted on as-built SLM samples or polished samples. The analysis of failure surfaces allowed identifying different heterogeneities at the origin of the fatigue damage for each configuration. The embedded particles on the surface of as-build specimens have been shown to play an important role in fatigue and need to be optimized or taken into account in the fatigue strength design of SLM components.

中文翻译:

SLM 工艺参数对 Inconel 625 成品零件表面光洁度、孔隙率和疲劳行为的影响

摘要 本文致力于了解 SLM 制造的 Inconel 625 的疲劳裂纹萌生,使用阴影 + 轮廓程序。在论文的第一部分,找到了一组最佳参数,以提供最佳表面粗糙度和低孔隙率。这种工艺优化,主要集中在调整体积能量密度,旨在找到最佳致密化状态和最少数量的污染飞溅之间的折衷。其次,已经对竣工的 SLM 样品或抛光样品进行了疲劳测试活动。失效表面的分析允许识别每种配置的疲劳损伤起源处的不同异质性。
更新日期:2018-05-01
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