Journal ArticleDOI
Quantification and prediction of lack-of-fusion porosity in the high porosity regime during laser powder bed fusion of Ti-6Al-4V
TLDR
In this paper , the authors compare three common strategies to measure porosity: the Archimedes, micrograph-based, and micro-computed tomography approaches and find that while these methods work equally well at low void fraction, their predictions diverge at higher void fractions (> 5 %).About:
This article is published in Journal of Materials Processing Technology.The article was published on 2022-02-01. It has received 20 citations till now. The article focuses on the topics: Porosity & Fusion.read more
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Multi-scale defects in powder-based additively manufactured metals and alloys
TL;DR: In this paper , a review of multi-scale defects in AMed metals and alloys are identified and for the first time classified into three categories, including geometry related, surface integrity related and microstructural defects.
Journal ArticleDOI
An overview of modern metal additive manufacturing technology
TL;DR: A comprehensive overview of the essential features of metal additive manufacturing techniques based on the most recent scientific knowledge is provided in this article , which explores emerging research on four of the most significant technologies, including material extrusion (ME), binder jetting (BJ), powder bed fusion (PBF), and DED.
Journal ArticleDOI
Local prediction of Laser Powder Bed Fusion porosity by short-wave infrared imaging thermal feature porosity probability maps
TL;DR: In this paper , the porosity from a cylindrical specimen is measured by ex-situ micro-computed tomography (μCT), combined with the microCT data, are used to generate thermal feature-based porosity probability maps.
Journal ArticleDOI
Modulating fracture toughness through processing-mediated mesostructure in additively manufactured Al-12Si Alloy
TL;DR: In this paper , a multiscale cohesive zone-based computational model and a semi-analytical approach for kinked cracks are used to investigate the effect of melt pool configuration on fracture energy enhancement and anisotropy due to crack path tortuosity.
Journal ArticleDOI
Mechanical and fluid characteristics of triply periodic minimal surface bone scaffolds under various functionally graded strategies
TL;DR: In this article , the authors carried out a comprehensive numerical and experimental assessment on the impact of graded IWP structures on the effective elastic modulus, Gaussian curvature, permeability, and fluid-induced wall shear stress.
References
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Journal ArticleDOI
A new finite element model for welding heat sources
TL;DR: In this article, a double ellipsoidal geometry is proposed to model both shallow penetration arc welding processes and the deeper penetration laser and electron beam processes, which can be easily changed to handle non-axisymmetric cases such as strip electrodes or dissimilar metal joining.
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On the role of melt flow into the surface structure and porosity development during selective laser melting
Chunlei Qiu,Chinnapat Panwisawas,Mark Ward,Hector Basoalto,Jeffery Brooks,Moataz M. Attallah +5 more
TL;DR: In this paper, the development of surface structure and porosity of Ti-6Al-4V samples fabricated by selective laser melting under different laser scanning speeds and powder layer thicknesses has been studied and correlated with the melt flow behavior through both experimental and modelling approaches.
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Mechanical properties of porous titanium compacts prepared by powder sintering
TL;DR: Porous Ti compacts for biomedical applications are successfully fabricated in the porosity range from 50 to 371 vol% by controlling sintering conditions and Ti powder sizes as discussed by the authors, where Young's modulus and bending strength at the porosa of around 30 vol% are found to be similar to those of human cortical bone.
Journal ArticleDOI
Comparison of density measurement techniques for additive manufactured metallic parts
TL;DR: In this article, the accuracies of the three measurement principles: Archimedes method, microscopic analysis of cross sections and X-ray scanning were investigated for additive manufactured parts using selective laser melting (SLM) or electron beam melting (EBM).
Journal ArticleDOI
Optimisation of process parameters to address fundamental challenges during selective laser melting of Ti-6Al-4V: A review
TL;DR: In this paper, the authors identify the state of the art in process optimisation which is being used to confront these challenges in the as-built state with a view to removing the reliance on post processing.