Abstract
In recent years, the industrial application of Inconel 625 has grown significantly. This material is a nickel-base alloy, which is well known for its chemical resistance and mechanical properties, especially in high-temperature environments. The fatigue performance of parts produced via Metallic Additive Manufacturing (MAM) heavily rely on their manufacturing parameters. Therefore, it is important to characterize the properties of alloys produced by a given set of parameters. The present work proposes a methodology for characterization of the mechanical properties of MAM parts, including the material production parametrization by Laser Directed Energy Deposition (DED). The methodology consists of the testing of miniaturized specimens, after their production in DED, supported by a numerical model developed and validated by experimental data for stress calculation. An extensive mechanical characterization, with emphasis on high-cycle fatigue, of Inconel 625 produced via DED is herein discussed. The results obtained using miniaturized specimens were in good agreement with standard-sized specimens, therefore validating the applied methodology even in the case of some plastic effects. Regarding the high-cycle fatigue properties, the samples produced via DED presented good fatigue performance, comparable with other competing Metallic Additive Manufactured (MAMed) and conventionally manufactured materials.
Highlights
Additive Manufacturing (AM) can be defined as the process of adding material, layer-by-layer, in order to create a new part or improve an existing one [1]
Nguejio et al [11] had performed extensive research about the tensile properties of Inconel 625 specimens, comparing materials obtained via conventional, Powder Bed Fusion (PBF) and Directed Energy Deposition (DED) processes encompassing the effect of heat-treatment on the tensile properties
Kim et al [12] have performed a comparison between the fatigue behaviour of PBF and wrought Inconel 625 specimens in a hot environment, and found superior properties of the additively manufactured (AMed) material for a smaller number of cycles to failure
Summary
Additive Manufacturing (AM) can be defined as the process of adding material, layer-by-layer, in order to create a new part or improve an existing one [1]. Nguejio et al [11] had performed extensive research about the tensile properties of Inconel 625 specimens, comparing materials obtained via conventional, PBF and DED processes encompassing the effect of heat-treatment on the tensile properties. Kim et al [12] have performed a comparison between the fatigue behaviour of PBF and wrought Inconel 625 specimens in a hot environment, and found superior properties of the additively manufactured (AMed) material for a smaller number of cycles to failure (low-cycle fatigue). Related to the fatigue behaviour of AMed nickel superalloys Nicoletto and his team performed extensive characterization of Inconel 718 obtained via PBF, using a novel approach based on the use of miniaturized fatigue specimens. Further a cost-effective fatigue testing methodology is explored which can be envisaged as a new trend for AMed materials fatigue testing to be possibly incorporated in future testing standards, after validation
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