Metallurgical investigations of laser remelted additively manufactured AlSi10Mg parts

Schanz, Jochen; Hofele, Markus; Ruck, Simon; Schubert, Tim; Hitzler, Leonhard; Schneider, Gerhard; Merkel, Markus; Riegel, Harald

doi:10.1002/mawe.201700039

Cited by 22 publications

(24 citation statements)

References 21 publications

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“…In recent studies, the combination of AM fabrication with postlaser-polishing was suggested and its general feasibility was proven. [283][284][285]…”

Section: Influencing Mechanisms Affected Properties Referencesmentioning

confidence: 99%

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

et al. 2018

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Additive manufacturing has multiple advantages over conventional fabrication techniques, such as the geometrical freedom and, to a great extent, the omission of tooling equipment. Hence, futuristic designs and non-standard topology-optimized structures can be fabricated without causing noteworthy extra cost, since the geometrical complexity is, exaggeratedly spoken, for free. The manufacturing time and the amount of required raw material are the key criteria, which determine the expenses. What at first glance appears as an engineer's dream, introduces its complexity in the description of the material's characteristics and their volatility to the manufacturing conditions. Within this study, the main properties (i.e., surface hardness, tensile, and compression strength, as well as fracture toughness) and their anisotropic and inhomogeneous nature are addressed. Detailed overviews of the progress to date for aluminum, iron, titanium, cobalt, and nickel based raw materials are provided. Furthermore, an overview about the state-of-the-art in the medical sector is included, comprising the areas of utilization and several trail studies.

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“…In recent studies, the combination of AM fabrication with postlaser-polishing was suggested and its general feasibility was proven. [283][284][285]…”

Section: Influencing Mechanisms Affected Properties Referencesmentioning

confidence: 99%

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

et al. 2018

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“…However, for dental metallic devices, the RD is also relevant to accomplish a tissue-friendly, void-free, satin finish, which is achieved via electrolytic polishing to prevent fitting, and cleaning problems on the fitting surface of denture frameworks. Given that in SLM the residual porosity tends to be common in the subsurface, which is the transition area between the contour and core irradiation, lower RD could potentially lead to laid open pores after polishing [10,31,32].…”

Section: Relative Densitymentioning

confidence: 99%

Additive Manufacturing of Cobalt-Based Dental Alloys: Analysis of Microstructure and Physico-Mechanical Properties

Hitzler¹,

Alifui‐Segbaya²,

Williams³

et al. 2018

Preprint

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The limitations of investment casting of cobalt-based alloys are claimed to be less problematic with significant improvements in metal additive manufacturing by selective laser melting (SLM). Despite these advantages, the metallic devices are likely to display mechanical anisotropy in relation to build orientations, which could consequently affect their performance ‘in vivo’. In addition, there are inconclusive evidence concerning the requisite composition and post-processing steps (e.g. heat-treatment to relieve stress) that must be completed prior to the devices being used. In the current paper, we evaluate the microstructure of ternary cobalt-chromium-molybdenum (Co-Cr-Mo) and cobalt-chromium-tungsten (Co-Cr-W) alloys built with Direct Metal Printing and LaserCUSING SLM systems respectively at 0°, 30°, 60° and 90° inclinations (Φ) in as-built (AB) and heat-treated (HT) conditions. The study also examines the tensile properties (Young's modulus, E; yield strength, RP0.2; elongation at failure, At and ultimate tensile strength, Rm), relative density (RD), and micro-hardness (HV5) and macro-hardness (HV20) as relevant physico-mechanical properties of the alloys. Data obtained indicate improved tensile properties and HV values after short and cost-effective heat-treatment cycle of Co-Cr-Mo alloy; however, the process did not homogenize the microstructure of the alloy. Annealing heat-treatment of Co-Cr-W led to significant isotropic characteristics with increased E and At (except for Φ = 90º) in contrast to decreased RP0.2, Rm and HV values, compared to the AB form. Similarly, the interlaced weld-bead structures in AB Co-Cr-W were removed during heat-treatment, which led to a complete recrystallization in the microstructure. Both alloys exhibited defect-free microstructures with RD exceeding 99.5%.

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“…Apart from conventional subtractive procedures, multiple contactless surface modification feasibility studies have been undertaken which all share the benefit of offering a similar geometric flexibility to AM. Alrbaey et al [ 27 ] and Schanz et al [ 28 , 29 ] investigated the surface laser-polishing of AM components and reported successful roughness reductions in the range from 80% to 92%. In addition to surface quality enhancement, the laser surface modification can also be utilized to adjust surface hardening, as shown by Martínez et al [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

On the Anisotropic Mechanical Properties of Selective Laser-Melted Stainless Steel

et al. 2017

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The thorough description of the peculiarities of additively manufactured (AM) structures represents a current challenge for aspiring freeform fabrication methods, such as selective laser melting (SLM). These methods have an immense advantage in the fast fabrication (no special tooling or moulds required) of components, geometrical flexibility in their design, and efficiency when only small quantities are required. However, designs demand precise knowledge of the material properties, which in the case of additively manufactured structures are anisotropic and, under certain circumstances, inhomogeneous in nature. Furthermore, these characteristics are highly dependent on the fabrication settings. In this study, the anisotropic tensile properties of selective laser-melted stainless steel (1.4404, 316L) are investigated: the Young’s modulus ranged from 148 to 227 GPa, the ultimate tensile strength from 512 to 699 MPa, and the breaking elongation ranged, respectively, from 12% to 43%. The results were compared to related studies in order to classify the influence of the fabrication settings. Furthermore, the influence of the chosen raw material was addressed by comparing deviations on the directional dependencies reasoned from differing microstructural developments during manufacture. Stainless steel was found to possess its maximum strength at a 45° layer versus loading offset, which is precisely where AlSi10Mg was previously reported to be at its weakest.

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Metallurgical investigations of laser remelted additively manufactured AlSi10Mg parts

Cited by 22 publications

References 21 publications

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

Additive Manufacturing of Cobalt-Based Dental Alloys: Analysis of Microstructure and Physico-Mechanical Properties

On the Anisotropic Mechanical Properties of Selective Laser-Melted Stainless Steel

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