Journal ArticleDOI
Experimental investigation and statistical optimisation of the selective laser melting process of a maraging steel
TLDR
In this article, the authors performed an experimental investigation and a successive statistical optimization of the parameters of the selective laser melting process of the 18Ni300 maraging steel and found that the best part properties were produced with the laser power bigger than 90 W and the velocity smaller than 220 mm/s.Abstract:
Selective Laser Melting (SLM) is an Additive Manufacturing process (AM) that built parts from powder using a layer-by-layer deposition technique. The control of the parameters that influence the melting and the amount of energy density involved in the process is paramount in order to get valuable parts. The objective of this paper is to perform an experimental investigation and a successive statistical optimization of the parameters of the selective laser melting process of the 18Ni300 maraging steel. The experimental investigation involved the study of the microstructure, the mechanical and surface properties of the laser maraging powder. The outcomes of experimental study demonstrated that the hardness, the mechanical strength and the surface roughness correlated positively to the part density. Parts with relative density higher than 99% had a very low porosity that presented closed and regular shaped pores. The statistical optimization determined that the best part properties were produced with the laser power bigger than 90 W and the velocity smaller than 220 mm/s.read more
Citations
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Journal ArticleDOI
Evolution of the microstructure and multi-objective optimization of the tensile properties of GH3625 superalloy by selective laser melting
TL;DR: In this paper , a method combining response surface methodology (RSM) with non-dominated ranking genetic algorithm-III (NSGA-III) is proposed to generate optimal process parameters to maximize yield strength, ultimate tensile strength and elongation of superalloys.
Journal ArticleDOI
Investigation on Mechanical Properties’ Anisotropy of Rod Units in Lattice Structures Fabricated by Selective Laser Melting
TL;DR: In this article, a series of rod units with different inclination angle and diameter were fabricated by SLM and the mechanical properties of these units were measured by tensile test and the results showed that the rod units had good mechanical properties and showed no difference.
Journal ArticleDOI
Influence of Spattering on In-process Layer Surface Roughness during Laser Powder Bed Fusion
TL;DR: In this paper , a method of extracting and registering MP spatter metrics is developed by machine learning of the in-situ imaging data, which can help predict the layer surface roughness more accurately (>50% less error).
Journal ArticleDOI
Additive manufacturing process parameter determination for a new Fe-C-Cu alloy
TL;DR: In this paper , an optimal processing window based upon laser speeds that achieve minimal porosity was quantified via comparisons of measured melt pool penetration, scan speeds, printed material density and laser beam energy density on a commercial LPBF unit operating at 350 W, 80 μm hatch spacing, and 50 μm layer thickness.
Journal ArticleDOI
Introducing Hatch Spacing into Deposited Energy Density toward Efficient Optimization of Laser Powder Bed Fusion Process Parameters
TL;DR: In this paper , the effect of hatch spacing on the deposited energy density of the PBF-manufactured Al-12Si alloy with laser conditions (P, v, and S) was investigated.
References
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Journal ArticleDOI
A study of the microstructural evolution during selective laser melting of Ti–6Al–4V
TL;DR: In this article, the development of the microstructure of the Ti-6Al-4V alloy processed by selective laser melting (SLM) was studied by light optical microscopy.
Journal ArticleDOI
Selective laser melting of iron-based powder
Jean-Pierre Kruth,Ludo Froyen,J. Van Vaerenbergh,Peter Mercelis,Marleen Rombouts,Bert Lauwers +5 more
TL;DR: In this paper, a mixture of different types of particles (Fe, Ni, Cu and Fe3P) specially developed for selective laser sintering (SLS) is described.
Journal ArticleDOI
Steady state columnar and equiaxed growth of dendrites and eutectic
TL;DR: In this article, an analysis for the growth of equiaxed grains ahead of the columnar front during directional solidification is presented, and the model considers both single-phase and eutectic growth.
Book
Properties and selection : irons, steels, and high-performance alloys
Joseph R. Davis,Lois A. Abel +1 more
TL;DR: A comprehensive guide to compositions, properties, performance, and selection of cast irons, carbon and low-alloy steels, tool steels and stainless steels is presented in this article.
Journal ArticleDOI
Additive manufactured AlSi10Mg samples using Selective Laser Melting (SLM): Microstructure, high cycle fatigue, and fracture behavior
TL;DR: In this paper, the microstructure, high cycle fatigue (HCF), and fracture behavior of additive manufactured AlSi10Mg samples are investigated, and the results were analyzed statistically by design of experiments, correlation analysis, and marginal means plots.