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Validated Computational Modelling Techniques for Simulating Melt Pool Ejecta In Laser Powder Bed Fusion Processing
(University of Texas at Austin, 2019)
Industry currently require faster build rates from laser powder bed fusion processes. As
such, higher power lasers and multi-laser systems are being explored. Due to instabilities in the
melting process, material is ...
Evaluating the Corrosion Performance of Wrought and Additively Manufactured (AM) Invar ® and 17-4PH
(University of Texas at Austin, 2019)
A Renishaw AM 400 was used to produce Laser Powder Bed fusion (LPBF) iron alloy Invar
® and 17-4PH components. Build parameters were systematically changed and the corrosion
performance of the samples produced was ...
Additive Manufacturing of Fatigue Resistant Materials: Avoiding the Early Life Crack Initiation Mechanisms During Fabrication
(University of Texas at Austin, 2019)
The full potential of additive manufacturing (AM) has been limited by the process induced
defects within the fabricated materials. Defects such as lack of fusions and gas entrapped pores act
as stress concentrators and ...
Melting Mode Thresholds in Laser Powder Bed Fusion and Their Application Towards Process Parameter Development
(University of Texas at Austin, 2019)
Depending on processing conditions, laser powder bed fusion (LPBF) has broadly two different
processing regimes, conduction and keyhole mode. Heat conduction governs the melt pool morphology observed
in conduction mode ...
Computational Modelling and Experimental Validation of Single In625 Line Tracks in Laser Powder Bed Fusion
(University of Texas at Austin, 2019)
Laser track experiments are performed using INCONEL® nickel-based powder alloy,
IN625, in a Powder Bed Fusion (PBF) system. Optical microscopy is used to obtain key track
dimensions and morphology for various machine ...
Investigating the Build Consistency of a Laser Powder Bed Fused Nickel-Based Superalloy, Using the Small Punch Technique
(University of Texas at Austin, 2019)
Inconel 718 (IN718) is a nickel-based superalloy that possesses impressive corrosion
resistance and high strength properties at elevated temperatures, making it an ideal choice for
aerospace applications. However, with ...
Effects of Spatial Energy Distribution on Defects and Fracture of LPBF 316L Stainless Steel
(University of Texas at Austin, 2019)
Measures of energy input and spatial energy distribution during laser powder bed fusion
additive manufacturing have significant implications for the build quality of parts, specifically
relating to formation of internal ...
An Aluminum-Lithium Allloy Produced by Laser Powder Bed Fusion
(University of Texas at Austin, 2019)
Aluminum-lithium (Al-Li) alloys are promising to replace traditional high-strength
aluminum alloys in aerospace and military industries due to their low density, high specific strength,
and excellent corrosion resistance. ...
Analysis of the Shielding Gas Dependent L-PBF Process Stability by Means of Schlieren and Shadowgraph Techniques
(University of Texas at Austin, 2019)
Ensuring a robust and reproducible Laser Powder Bed Fusion (L-PBF) process depends on
the design of the shielding gas flow in the corresponding manufacturing system. The gas flow
assures the removal of particles from the ...
New Support Structures for Reduced Overheating on Downfacing Regions of Direct Metal Printed Parts
(University of Texas at Austin, 2019)
In Laser Powder Bed Fusion (LPBF), the downfacing surfaces usually have increased surface
roughness and reduced dimensional accuracy due to local overheating and warpage. To partially
overcome this a new supporting ...