Thermal post-processing of AlSi10Mg parts produced by Selective Laser Melting using recycled powder
TLDR
In this article, the effect of thermal post-processing of AlSi10Mg parts, using recycled powder, with the aim of improving the microstructure homogeneity of the as-built parts was evaluated.Abstract:
The performance enhancement of parts produced using Selective Laser Melting (SLM) is an important goal for various industrial applications. In order to achieve this goal, obtaining a homogeneous microstructure and eliminating material defects within the fabricated parts are important research issues. The objective of this experimental study is to evaluate the effect of thermal post-processing of AlSi10Mg parts, using recycled powder, with the aim of improving the microstructure homogeneity of the as-built parts. This work is essential for the cost-effective additive manufacturing (AM) of metal optics and optomechanical systems. To achieve this goal, a full characterization of fresh and recycled powder was performed, in addition to a microstructure assessment of the as-built fabricated samples. Annealing, solution heat treatment (SHT) and T6 heat treatment (T6 HT) were applied under different processing conditions. The results demonstrated an improvement in microstructure homogeneity after thermal post-processing under specific conditions of SHT and T6 HT. A micro-hardness map was developed to assist in the selection of the optimized post-processing parameters in order to satisfy the design requirements of the part.read more
Citations
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3D printing of Aluminium alloys: Additive Manufacturing of Aluminium alloys using selective laser melting
Nesma T. Aboulkhair,Marco Simonelli,Luke Parry,Ian Ashcroft,Christopher Tuck,Richard J.M. Hague +5 more
TL;DR: A comprehensive understanding of the interrelation between the various aspects of the subject, as this is essential to demonstrate credibility for industrial needs, is presented in this paper, which highlights some key topics requiring attention for further progression.
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Powders for powder bed fusion: a review
Silvia Vock,Burghardt Klöden,Alexander Kirchner,Thomas Weißgärber,Bernd Kieback,Bernd Kieback +5 more
TL;DR: The aim of this review is to assess building blocks of knowledge and to provide an overview on the current state of the art of powder characterization in the additive manufacturing context.
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Effect of Selective Laser Melting Process Parameters on the Quality of Al Alloy Parts: Powder Characterization, Density, Surface Roughness, and Dimensional Accuracy.
TL;DR: This study investigates the influence of selective laser melting (SLM) process parameters on the quality of parts fabricated from different Al alloys and develops a process map for each material by combining the optimized range of SLM process parameters for each characteristic to ensure good quality of the as-built parts.
Journal ArticleDOI
Effect of heat treatment on the microstructure and anisotropy in mechanical properties of A357 alloy produced by selective laser melting
TL;DR: A357 alloy was manufactured by selective laser melting (SLM) and subjected to different heat treatments, by considering the stress relief step as critical, to establish the microstructure-mechanical property relationship and model the yield strength.
Journal ArticleDOI
Strengthening mechanisms in direct metal laser sintered AlSi10Mg: Comparison between virgin and recycled powders
TL;DR: Rod shaped samples of AlSi10Mg additively manufactured using recycled powder through direct metal laser sintering (DMLS) process showed higher quasi-static uniaxial tensile strength in both horizontal and vertical build directions than those of cast counterpart alloy as discussed by the authors.
References
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Book
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TL;DR: Gibson et al. as discussed by the authors presented a comprehensive overview of additive manufacturing technologies plus descriptions of support technologies like software systems and post-processing approaches, and provided systematic solutions for process selection and design for AM Additive Manufacturing Technologies: Rapid Prototyping to Direct Digital Manufacturing.
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TL;DR: In this article, the Scherrer constants of simple regular shapes have been determined for all low-angle reflections (h2 + k2 + l2 ≤ 100) for four measures of breadth.
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The metallurgy and processing science of metal additive manufacturing
TL;DR: In this article, a review of additive manufacturing (AM) techniques for producing metal parts are explored, with a focus on the science of metal AM: processing defects, heat transfer, solidification, solid-state precipitation, mechanical properties and post-processing metallurgy.
Journal ArticleDOI
Fine-structured aluminium products with controllable texture by selective laser melting of pre-alloyed AlSi10Mg powder
TL;DR: In this paper, the high thermal gradients occurring during SLM lead to a very fine microstructure with submicron-sized cells, which can be modified to a weak cube texture along the building and scanning directions when a rotation of 90° of the scanning vectors within or between the layers is applied.
Journal ArticleDOI
Reducing porosity in AlSi10Mg parts processed by selective laser melting
TL;DR: In this article, the windows of parameters required to produce high density parts from AlSi10Mg alloy using selective laser melting were investigated and a compromise between the different parameters and scan strategies was achieved and used to produce parts achieving a density of 99.8%.