Post-processing effects on the surface characteristics of Inconel 718 alloy fabricated by selective laser melting additive manufacturing

Kaynak, Yusuf; Taşçıoğlu, Emre

doi:10.1007/s40964-019-00099-1

Cited by 54 publications

(14 citation statements)

References 39 publications

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“…The VSF process is a frequently used mass finishing operation that is mainly applied to alter the surface quality and impart the necessary compressive stresses on the components' surfaces [17]. Since the high tensile residual stresses in the top layers of the SLS components can facilitate the crack nucleation and its growth, the VSF process can fix it and enhance the overall performance of the SLS components [18,19]. The effect of the VSF process and its duration on the surface texture of the as-built SLS samples can be seen in Fig.…”

Section: Microstructurementioning

confidence: 99%

Improving the surface quality and mechanical properties of selective laser sintered PA2200 components by the vibratory surface finishing process

et al. 2021

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This paper attempts to improve the physical and mechanical properties of selective laser sintered polyamide PA2200 components through a vibratory surface finishing process by inducing severe plastic deformation at the outer surface layers. The industrial target of additive manufacturing components is to obtain structures having surface roughness, hardness, and other mechanical properties equivalent to or better than those produced conventionally. Compared to the as-built SLS PA2200 samples, vibratory surface finishing treated specimens exhibited a smooth surface microstructure and more favorable roughness, hardness, and tensile strength. Also, the duration of the vibratory surface finishing process showed a further improvement in the surface roughness and hardness of the SLS samples. Compared to the as-built state, the roughness and hardness of the surface-treated samples improved by almost 90% and 15%, respectively. Consequently, microstructural analysis indicates that lower surface roughness and enhanced surface hardness is a crucial factor in influencing the overall tensile strength of SLS-PA2200 components. We consider that the combination of VSF and SLS processes can successfully handle a wide range of potential applications. This study also highlights the efficiency and applicability of the vibratory surface finishing process to other additive manufacturing processes and materials. Graphic abstract

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Section: Microstructurementioning

confidence: 99%

Improving the surface quality and mechanical properties of selective laser sintered PA2200 components by the vibratory surface finishing process

et al. 2021

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“…The evaluation of surface morphology has always been an important indicator of AM samples, because the surface quality of the formed parts directly affects the service performance of the components [ 40 ]. Therefore, it is meaningful to analyze the surface quality of the SLM samples fabricated in different building orientations.…”

Section: Resultsmentioning

confidence: 99%

Multi-Perspective Analysis of Building Orientation Effects on Microstructure, Mechanical and Surface Properties of SLM Ti6Al4V with Specific Geometry

Cai

Song

et al. 2021

Materials

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Building orientation is important in selective laser melting (SLM) processes. Current studies only focus on the horizontal and vertical building orientations without considering different modes of horizontal orientations. In fact, for horizontal orientation, different surfaces of the sample that contact the substrate will affect the heat transfer mode and efficiency, and in turn affect the microstructure and material properties. In this paper, the effect of two modes of horizontal building orientations on microstructure, mechanical and surface properties of SLM Ti6Al4V was studied. Current research about building orientation is deficient because the geometry of samples or test surfaces are not strictly defined, which seriously influences the results due to their different heat transfer efficiency and mode. Therefore, the geometry of the samples and test surfaces were clearly defined, and its necessity was proved in this study. To achieve the research goal, three test samples were prepared: sample SLM-PB-S with the building orientation parallel to the substrate and the shorter side L1 contacts it, sample SLM-PB-L with the building orientation parallel to the substrate and the longer side L2 contacts it and sample SLM-VB with the building orientation vertical to the substrate. Subsequently, the microstructure, grain information, densification, residual stress, micro-hardness, tensile properties and surface topography of different samples were analyzed and compared. In the results, SLM-PB-S exhibited denser microstructure and better mechanical properties than SLM-PB-L, including smaller grain size, stronger texture, higher density, micro-hardness, tensile strength, plasticity and better surface quality. It originates from a higher cooling rate and shorter scanning time between layers during SLM-PB-S fabrication, leading to finer grains, lower porosity and better interlayer metallurgical bonding, thus resulting in better material properties. This study can provide a reference to select the proper building orientation in SLM.

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“…Currently to address the surface roughness issues of AM parts, post-processing methods such as abrasive blasting (Sagbas, 2020), shot peening (AlMangour and Yang, 2016) and laser polishing (Zhang et al, 2020) are utilised. The choice of post-processing method can have an impact on the properties of the outer layer of AM parts and part geometry, therefore careful consideration of method choice must be taken (Bouland et al, 2019;Kaynak and Tascioglu, 2020;Sagbas, 2020). However, there are limited available standards to help in the choice of appropriate methods.…”

Section: Surface (Post)-processingmentioning

confidence: 99%

Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

2021

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One often-cited benefit of using metal additive manufacturing (AM) is the possibility to design and produce complex geometries that suit the required function and performance of end-use parts. In this context, laser powder bed fusion (LPBF) is one suitable AM process. Due to accessibility issues and cost-reduction potentials, such ‘complex’ LPBF parts should utilise net-shape manufacturing with minimal use of post-process machining. The inherent surface roughness of LPBF could, however, impede part performance, especially from a structural perspective and in particular regarding fatigue. Engineers must therefore understand the influence of surface roughness on part performance and how to consider it during design. This paper presents a systematic literature review of research related to LPBF surface roughness. In general, research focuses on the relationship between surface roughness and LPBF build parameters, material properties, or post-processing. Research on design support on how to consider surface roughness during design for AM is however scarce. Future research on such supports is therefore important given the effects of surface roughness highlighted in other research fields.

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Post-processing effects on the surface characteristics of Inconel 718 alloy fabricated by selective laser melting additive manufacturing

Cited by 54 publications

References 39 publications

Improving the surface quality and mechanical properties of selective laser sintered PA2200 components by the vibratory surface finishing process

Improving the surface quality and mechanical properties of selective laser sintered PA2200 components by the vibratory surface finishing process

Multi-Perspective Analysis of Building Orientation Effects on Microstructure, Mechanical and Surface Properties of SLM Ti6Al4V with Specific Geometry

Surface Roughness Considerations in Design for Additive Manufacturing - A Literature Review

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