Investigation on fatigue strength of sand-blasted DMLS-AlSi10Mg alloy

Avanzini, Andrea; Battini, Davide; Gelfi, Marcello; Girelli, Luca; Petrogalli, Candida; Pola, Annalisa; Tocci, Marialaura

doi:10.1016/j.prostr.2019.08.146

Cited by 31 publications

(15 citation statements)

References 24 publications

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“…As discussed in the literature, porosities may be present in the subsurface layers of AM samples [94,95], and studies have shown that defects closer to the surface can be more detrimental to fatigue resistance [16,96]. These can be completely removed (or not) by milling or polishing, depending on how deep the surface is machined, with respect to defect size and position.…”

Section: Fatigue Of L-pbf 316l: Influence Of Surface Finish and Treat...mentioning

confidence: 99%

Fatigue Behavior of Additively Manufactured Stainless Steel 316L

Avanzini

2022

Materials

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316L stainless steel is the material of choice for several critical applications in which a combination of mechanical strength and resistance to corrosion is required, as in the biomedical field. Additive Manufacturing (AM) technologies can pave the way to new design solutions, but microstructure, defect types, and surface characteristics are substantially different in comparison to traditional processing routes, making the assessment of the long-term durability of AM materials and components a crucial aspect. In this paper a thorough review is presented of the relatively large body of recent literature devoted to investigations on fatigue of AM 316L, focusing on the comparison between different AM technologies and conventional processes and on the influence of processing and post-processing aspects in terms of fatigue strength and lifetime. Overall fatigue data are quite scattered, but the dependency of fatigue performances on surface finish, building orientation, and type of heat treatment can be clearly appreciated, as well as the influence of different printing processes. A critical discussion on the different testing approaches presented in the literature is also provided, highlighting the need for shared experimental test protocols and data presentation in order to better understand the complex correlations between fatigue behavior and processing parameters.

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Section: Fatigue Of L-pbf 316l: Influence Of Surface Finish and Treat...mentioning

confidence: 99%

Fatigue Behavior of Additively Manufactured Stainless Steel 316L

Avanzini

2022

Materials

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“…To check the reasonability of the proposed fatigue calculation method, we compare the experimental value with the prediction of Equation 6 for two independent fatigue scenarios not used to calibrate the constant C. The former is a rolled aeronautical Al grade 7075-T651, which was fatigue tested by Benedetti et al 21,27 In this case as well, a fine dispersion of intermetallic precipitates of maximum size of about 10 μm emerged from metallographic analyses. The latter is a cast Al grade AlSi10Mg additively manufactured by Avanzini et al 28 via laser powder bed fusion. Fractographic inspections on fatigued specimens revealed that near-surface pores of about 90 μm equivalent diameter were the main source of fatigue crack initiation.…”

Section: High-cycle Fatigue Propertiesmentioning

confidence: 99%

On the variability in static and cyclic mechanical properties of extruded 7075‐T6 aluminum alloy

Benedetti

Menapace

Fontanari

et al. 2021

Fatigue Fract Eng Mat Struct

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The present paper investigates the variability in the static and cyclic properties of two nominally identical supplies of the aeronautical Al grade 7075-T6. Samples were extracted from extruded bars of 15 and 60 mm diameter and with slightly different chemical composition. Noticeable differences were found in tensile strength, total elongation, and low-and high-cycle fatigue strength, despite the nearly identical hardness value. The diverse mechanical behavior has been imputed to different extrusion ratio and therefore work hardening along with a more or less fine distribution of precipitates and dispersoids. The high-cycle fatigue strength was found to be in direct correlation with the monotonic yield strength and the size of the largest intermetallic precipitate. A simple equation based on Murakami sqrt (area) parameter is proposed to predict the fatigue endurance. Tensile tests and microstructural analyses are recommended instead of conventional hardness tests to have a tighter quality control on the mechanical properties of semifinished products.

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“…Majeed et al [48] acknowledged that solution heat treatment process reduced the average surface roughness by 17% at 540 0 C for 2 hours. Sand blasting (post treatment) has a positive effect on DMLS component that reduced average surface roughness by uniform distribution of porosities in the cross section and created superficial compression state in material that improved fatigue resistance [49,50] . Due to ever increasing demand in marine and automotive sectors, the additive manufacturing finding its own way of exploring new materials to suit these environments.…”

Section: Figure 6 Example Photograph Showing Typical Porous Areamentioning

confidence: 99%

A Review on Mechanical and Corrosion Behaviour of DMLS Materials

Subrahmanyam

Prasad²,

Rao

2020

EST

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Direct Metal Laser Sintering (DMLS) is an Additive Manufacturing (AM) technique in which the metal powder will be sintered in selected regions as per 3D CAD file in stack manner in order to produce a three dimensional object with less effort, in less possible time and with minimal wastage of metal. In this paper most widely used DMLS metal powders mechanical and corrosion properties were analyzed and the effect of post processes on the material properties were discussed. The objective of the paper is to fuse the works done so far and to identify gaps to identify the key areas of this technology. The promising and successful application of this revolutionary technology in various sectors like biomedical, aerospace and automotive was also discussed based on material behaviour at different operating conditions. This review would help researchers to find challenges in this booming technology. As per the materials point of view future research prospective was suggested in depth in light of present review.

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Investigation on fatigue strength of sand-blasted DMLS-AlSi10Mg alloy

Cited by 31 publications

References 24 publications

Fatigue Behavior of Additively Manufactured Stainless Steel 316L

Fatigue Behavior of Additively Manufactured Stainless Steel 316L

On the variability in static and cyclic mechanical properties of extruded 7075‐T6 aluminum alloy

A Review on Mechanical and Corrosion Behaviour of DMLS Materials

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