scholarly journals An open-architecture metal powder bed fusion system for in-situ process measurements

2017 ◽  
Vol 16 ◽  
pp. 177-185 ◽  
Author(s):  
P. Bidare ◽  
R.R.J. Maier ◽  
R.J. Beck ◽  
J.D. Shephard ◽  
A.J. Moore
Keyword(s):  
Metal Powder ◽  
Open Architecture ◽  
Fusion System ◽  
Powder Bed Fusion ◽  
Powder Bed ◽  
Process Measurements

scholarly journals Carbon Particle In-Situ Alloying of the Case-Hardening Steel 16MnCr5 in Laser Powder Bed Fusion

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 896
Author(s):  
Matthias Schmitt ◽  
Albin Gottwalt ◽  
Jakob Winkler ◽  
Thomas Tobie ◽  
Georg Schlick ◽  
...  
Keyword(s):  
Laser Beam ◽  
Mechanical Strength ◽  
Carbon Content ◽  
Metal Powder ◽  
Case Hardening ◽  
Powder Bed Fusion ◽  
Powder Bed ◽  
Carbon Particles ◽  
Case Hardening Steel

The carbon content of steel affects many of its essential properties, e.g., hardness and mechanical strength. In the powder bed fusion process of metals using a laser beam (PBF-LB/M), usually, pre-alloyed metal powder is solidified layer-by-layer using a laser beam to create parts. A reduction of the carbon content in steels is observed during this process. This study examines adding carbon particles to the metal powder and in situ alloying in the PBF-LB/M process as a countermeasure. Suitable carbon particles are selected and their effect on the particle size distribution and homogeneity of the mixtures is analysed. The workability in PBF-LB is then shown. This is followed by an evaluation of the resulting mechanical properties (hardness and mechanical strength) and microstructure in the as-built state and the state after heat treatment. Furthermore, potential use cases like multi-material or functionally graded parts are discussed.

In-situ measurement and monitoring methods for metal powder bed fusion – an updated review

2021 ◽  
Author(s):  
Marco Luigi Giuseppe Grasso ◽  
Afaf Remani ◽  
Andrew Dickins ◽  
B M Colosimo ◽  
Richard K Leach
Keyword(s):  
Metal Powder ◽  
In Situ Measurement ◽  
Powder Bed Fusion ◽  
Monitoring Methods ◽  
Powder Bed

scholarly journals A laser powder bed fusion system for in situ x-ray diffraction with high-energy synchrotron radiation

2020 ◽  
Vol 91 (7) ◽  
pp. 075104
Author(s):  
Eckart Uhlmann ◽  
Erwin Krohmer ◽  
Felix Schmeiser ◽  
Norbert Schell ◽  
Walter Reimers
Keyword(s):  
Synchrotron Radiation ◽  
High Energy ◽  
Fusion System ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
X Ray Diffraction ◽  
Powder Bed ◽  
X Ray

A novel device for in-situ force measurements during laser powder bed fusion (L-PBF)

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Rodrigo Magana Carranza ◽  
Joseph Robinson ◽  
Ian Ashton ◽  
Peter Fox ◽  
Christopher Sutcliffe ◽  
...  
Keyword(s):  
Force Transducer ◽  
Inconel 625 ◽  
Layer By Layer ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Content Type ◽  
Powder Bed ◽  
Novel Device ◽  
Process Measurements

Purpose The purpose of this paper is to detail the design and first use of a force transducer device to study the development of forces during the laser-powder bed fusion (L-PBF) process from which residual stresses can be inferred. Design/methodology/approach The proposed novel device consists of an array of load cells for in-situ measurement of forces over time during the L-PBF additive manufacturing process. Measurements of the developed forces layer by layer were recorded in a first build using a 67-degree rotating scan strategy using Inconel 625 build material. Findings Preliminary experimental results from in-situ measurements using a 67-degree rotating scan strategy showed that the forces induced in the first five layers represented approximately 80% of the maximum on completion of the build and were distributed such as to induce concave deformation of the part, i.e. tension in the centre and compression at the edges of the part. Originality/value This paper describes a novel device for in-process measurement of the spatial distribution and time-varying nature of the forces induced during the L-PBF process as well as an evaluation of the residual forces following the completion of the build.

scholarly journals Improvement of polymer properties for powder bed fusion by combining in situ PECVD nanoparticle synthesis and dry coating

2021 ◽  
Author(s):  
Juan S. Gómez Bonilla ◽  
Björn Düsenberg ◽  
Franz Lanyi ◽  
Patrik Schmuki ◽  
Dirk W. Schubert ◽  
...  
Keyword(s):  
Nanoparticle Synthesis ◽  
Powder Bed Fusion ◽  
Dry Coating ◽  
Powder Bed ◽  
Polymer Properties

Toward Metamodels for Composable and Reusable Additive Manufacturing Process Models

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Paul Witherell ◽  
Shaw Feng ◽  
Timothy W. Simpson ◽  
David B. Saint John ◽  
Pan Michaleris ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Metal Powder ◽  
Manufacturing Process ◽  
Process Model ◽  
Model Development ◽  
Process Models ◽  
Powder Bed Fusion ◽  
Powder Bed ◽  
Future Work ◽  
Am Processes

In this paper, we advocate for a more harmonized approach to model development for additive manufacturing (AM) processes, through classification and metamodeling that will support AM process model composability, reusability, and integration. We review several types of AM process models and use the direct metal powder bed fusion AM process to provide illustrative examples of the proposed classification and metamodel approach. We describe how a coordinated approach can be used to extend modeling capabilities by promoting model composability. As part of future work, a framework is envisioned to realize a more coherent strategy for model development and deployment.

On the use of spatter signature for in-situ monitoring of Laser Powder Bed Fusion

2017 ◽  
Vol 16 ◽  
pp. 35-48 ◽  
Author(s):  
Giulia Repossini ◽  
Vittorio Laguzza ◽  
Marco Grasso ◽  
Bianca Maria Colosimo
Keyword(s):  
In Situ Monitoring ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

Titanium Alloys Manufactured by In Situ Alloying During Laser Powder Bed Fusion

JOM ◽  
2017 ◽  
Vol 69 (12) ◽  
pp. 2725-2730 ◽  
Author(s):  
I. Yadroitsev ◽  
P. Krakhmalev ◽  
I. Yadroitsava
Keyword(s):  
Titanium Alloys ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed
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