Results 81 to 90 of about 70,133 (297)

Experimental and numerical investigation of the origin of surface roughness in laser powder bed fused overhang regions

Virtual and Physical Prototyping, 2021
Surface roughness of laser powder bed fusion (L-PBF) printed overhang regions is a major contributor to deteriorated shape accuracy/surface quality. This study investigates the mechanisms behind the evolution of surface roughness (Ra) in overhang regions.
Shaochuan Feng, Amar M. Kamat, Soheil Sabooni, Yutao Pei   +3 more
doaj   +1 more source

Defect evolution in laser powder bed fusion additive manufactured components during thermo-mechanical testing [PDF]

, 2017
The mechanical performance of additively manufactured (AM) components remains an issue, limiting the implementation of AM technologies. In this work, a new method is presented, to examine the evolution of defects in an Inconel 718 two-bar test specimen ...
Clare, Adam T., Hyde, Christopher J., Leach, Richard K., Maskery, Ian, Thompson, Adam, Tuck, Christopher, Xu, Zhengkai   +6 more
core  

Solidification Morphology Analysis of SLM of Cu Powder [PDF]

, 2004
The solidification morphology analysis of fine Cu powder melted by a raster scanned energy beam from a focused Nd:YAG laser is presented here. The powder was processed inside of sealed chamber where it was subjected to a high vacuum cycle.
Bourell, David L., Ramos Grez, Jorge A.
core   +1 more source

Understanding the Stochastic Nature of Process Parameter Development of Blown Powder Laser Beam Directed Energy Deposition Additive Manufacturing of Pure Molybdenum

Advanced Engineering Materials, EarlyView.
Identified through the use of statistical design of experiments and metallographic investigation, this study exposes the stochastic origins of intergranular cracks in blown powder laser beam directed energy deposition additive manufacturing of pure molybdenum. It further demonstrates a successful crack mitigation approach with direct correlation to the
Nathaniel J. Lies, Daniel E. Driemeyer, Aaron P. Stebner   +2 more
wiley   +1 more source

Robust Spot Melting by 3D Spot Arrangements in Electron Beam Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
This work proposes an approach to replace separately melted contours for spot melting in electron beam powder fusion. Adapting the spot arrangements close to the contour combined with stacking yields a comparable surface quality without the inherent challenges of separate contours, as demonstrated, by electron optical images and roughness measurements.
Tobias Kupfer, Lukas Spano, Sebastian Pohl, Carolin Körner, Matthias Markl   +4 more
wiley   +1 more source

Pembinaan dan penilaian program rekabentuk rasuk keluli (PRRK) sebagai alat kognitif dalam pembelajaran rekabentuk struktur di kalangan pelajar diploma kejuruteraan awam KUiTTHO [PDF]

, 2002
Kajian awal yang telah dijalankan mendapati pelajar Kejuruteraan Awam KUiTTHO menghadapi masalah kognitif dalam pembelajaran mata pelajaran Rekabentuk Struktur khasnya dalam pemahaman konsep dan prosedur reka bentuk. Langkah pengiraan yang terlalu banyak
Antonisamy, Dorries
core  

Characterisation of the topography of metal additive surface features with different measurement technologies [PDF]

, 2017
The challenges of measuring the surface topography of metallic surfaces produced by additive manufacturing are investigated. The differences between measurements made using various optical and non-optical technologies, including confocal and focus ...
Adam Thompson, Carmignato S, Digital Surf, Gao F, George P-L, Giusca C L, Gomez C, Gong H, ISO 25178-2, ISO 25178-3, ISO 25178-604, ISO 25178-606, ISO 4287, ISO/DIS 25178-607, ISO/FDIS 25178-600, Leach R K, Nicola Senin, Richard K Leach, Thompson A, UK Additive Manufacturing Steering Group, Volume Graphics   +20 more
core   +2 more sources

LASER POWDER BED FUSION OF ALUMINUM ALLOYS

Acta Metallurgica Slovaca, 2017
The aim of this study is to analyze and to summarize the results of the processing of aluminum alloys, and in particular of the Al-Si-Mg alloys, by means of the Additive Manufacturing (AM) technique defined as Laser Powder Bed Fusion (L-PBF). This process is gaining interest worldwide thanks to the possibility of obtaining a freeform fabrication ...
Diego Manfredi, Róbert Bidulský
openaire   +3 more sources

Creep Properties and Deformation Mechanism of Additively Manufactured NiAl‐CrMo Composites

Advanced Engineering Materials, EarlyView.
Additively manufactured NiAl‐CrMo composites contain numerous interfaces and cell boundaries that control their creep response. At 700°C under high applied stress, creep is dominated by dislocation‐controlled power‐law mechanisms. At 800°C–900°C and lower stresses, creep is primarily diffusion‐controlled along cell boundaries.
Jan Vollhüter, Andreas Bezold, Johan Westraadt, Katharina Fiegl, Subham Chattoraj, Benjamin Wahlmann, Carolin Körner, Michael Mills, Mathias Göken, Steffen Neumeier   +9 more
wiley   +1 more source

Mechanical behaviour of additively manufactured lunar regolith simulant components [PDF]

, 2018
Additive manufacturing and its related techniques have frequently been put forward as a promising candidate for planetary in-situ manufacturing, from building life-sustaining habitats on the Moon to fabricating various replacements parts, aiming to ...
Athanasios Goulas, Brandt M, Daniel S Engstrøm, He C, Jon GP Binner, Rickman D, Ross J Friel, Russell A Harris, Simonelli M   +8 more
core   +2 more sources