Influence of SLM process parameters on the surface finish, porosity rate and fatigue behavior of as-built Inconel 625 parts

Koutiri, Imade; Pessard, Etienne; Peyre, P.; Amlou, Ouafae; Terris, Thibaut de

doi:10.1016/j.jmatprotec.2017.12.043

Cited by 277 publications

(130 citation statements)

References 22 publications

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“…Forthcoming experiments were conducted based on this parameter set, as it appears to be promising for the fabrication of nearly defect-free specimens made of case-hardening steel 16MnCr5. This is important, as internal defects can act as crack initiators, as it was already shown for different metallic materials in [18,19].…”

Section: Identification Of Suitable Parameter Rangementioning

confidence: 81%

Investigation on the Case-Hardening Behavior of Additively Manufactured 16MnCr5

Bartels

Klaffki

Pitz

et al. 2020

Metals

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Additive manufacturing (AM) technologies, such as laser-based powder bed fusion of metals (PBF-LB/M), allow for the fabrication of complex parts due to their high freedom of design. PBF-LB/M is already used in several different industrial application fields, especially the automotive and aerospace industries. Nevertheless, the amount of materials being processed using AM technologies is relatively small compared to conventional manufacturing. Due to this, an extension of the material portfolio is necessary for fulfilling the demands of these industries. In this work, the AM of case-hardening steel 16MnCr5 using PBF-LB/M is investigated. In this context, the influences of different processing strategies on the final hardness of the material are studied. This includes, e.g., stress relief heat treatment and microstructure modification to increase the resulting grain size, thus ideally simplifying the carbon diffusion during case hardening. Furthermore, different heat treatment strategies (stress relief heat treatment and grain coarsening annealing) were applied to the as-built samples for modifying the microstructure and the effect on the final hardness of case-hardened specimens. The additively manufactured specimens are compared to conventionally fabricated samples after case hardening. Thus, an increase in both case-hardening depth and maximum hardness is observed for additively manufactured specimens, leading to superior mechanical properties.

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Section: Identification Of Suitable Parameter Rangementioning

confidence: 81%

Investigation on the Case-Hardening Behavior of Additively Manufactured 16MnCr5

Bartels

Klaffki

Pitz

et al. 2020

Metals

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“…The contour scans are usually applied to reduce roughness of the sample, which is often dominated by the attached/partially unmolten powder particles [34]. However, in order to understand the effect of roughness on RS measurements one A4 sample without contour was investigated in this study.…”

Section: Effect Of Surface Roughnessmentioning

confidence: 99%

Exploring the Correlation between Subsurface Residual Stresses and Manufacturing Parameters in Laser Powder Bed Fused Ti-6Al-4V

Mishurova

Artzt

Haubrich

et al. 2019

Metals

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Subsurface residual stresses (RS) were investigated in Ti-6Al-4V cuboid samples by means of X-ray synchrotron diffraction. The samples were manufactured by laser powder bed fusion (LPBF) applying different processing parameters, not commonly considered in open literature, in order to assess their influence on RS state. While investigating the effect of process parameters used for the calculation of volumetric energy density (such as laser velocity, laser power and hatch distance), we observed that an increase of energy density led to a decrease of RS, although not to the same extent for every parameter variation. Additionally, the effect of support structure, sample roughness and LPBF machine effects potentially coming from Ar flow were studied. We observed no influence of support structure on subsurface RS while the orientation with respect to Ar flow showed to have an impact on RS. We conclude recommending monitoring such parameters to improve part reliability and reproducibility.

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“…Cherry et al investigated the relationship between the laser energy density and the properties of 316 L stainless steel [8], such as its porosity, surface roughness, microstructure, density and hardness. Koutiri et al focused on adjusting the volume energy density with the goal of finding a compromise between an optimum densification state and a minimum amount of contaminating spatter [9], and they finally found an optimum set of parameters that delivered the best surface roughness, combined with low porosity. Khanna et al found that the surface roughness was linearly related to the energy density in the process [10].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Laser Polishing of Four Selective Laser Melting Alloy Samples

Zhang

et al. 2020

Applied Sciences

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Selective laser melting (SLM) is a layer by layer process of melting and solidifying of metal powders. The surface quality of the previous layer directly affects the uniformity of the next layer. If the surface roughness value of the previous layer is large, there is the possibility of not being able to complete the layering process such that the entire process has to be abandoned. At least, it may result in long term durability problem and the inhomogeneity, may even make the processed structure not be able to be predicted. In the present study, the ability of a fiber laser to in-situ polish the rough surfaces of four typical additive-manufactured alloys, namely, Ti6Al4V, AlSi10Mg, 316L and IN718 was demonstrated. The results revealed that the surface roughness of the as-received alloys could be reduced to about 3 μm through the application of the laser-polishing process, and the initial surfaces had roughness values of 8.80–16.64 μm. Meanwhile, for a given energy density, a higher laser power produced a laser-polishing effect that was often more obvious, with the surface roughness decreasing with an increase in the laser power. Further, the polishing strategy will be optimized by simulation in our following study.

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Influence of SLM process parameters on the surface finish, porosity rate and fatigue behavior of as-built Inconel 625 parts

Cited by 277 publications

References 22 publications

Investigation on the Case-Hardening Behavior of Additively Manufactured 16MnCr5

Investigation on the Case-Hardening Behavior of Additively Manufactured 16MnCr5

Exploring the Correlation between Subsurface Residual Stresses and Manufacturing Parameters in Laser Powder Bed Fused Ti-6Al-4V

Investigation of Laser Polishing of Four Selective Laser Melting Alloy Samples

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