In-situ laser beam melting investigation with multi-wavelength digital holography

2021 ◽  
Author(s):  
Matthieu Piniard ◽  
Béatrice Sorrente ◽  
Gilles Hug ◽  
Pascal Picart
Keyword(s):  
Laser Beam ◽  
Digital Holography ◽  
Laser Beam Melting ◽  
Multi Wavelength

scholarly journals Selective laser beam melting of polymers: In situ and offline measurements for process adapted thermal characterization

Procedia CIRP ◽  
2018 ◽  
Vol 74 ◽  
pp. 238-243 ◽  
Author(s):  
Katrin Wudy ◽  
Sandra Greiner ◽  
Meng Zhao ◽  
Dietmar Drummer
Keyword(s):  
Laser Beam ◽  
Thermal Characterization ◽  
Laser Beam Melting

CHARACTERIZATION OF VC–VB PARTICLES REINFORCED FE-BASED COMPOSITE COATINGS PRODUCED BY LASER CLADDING

2016 ◽  
Vol 23 (04) ◽  
pp. 1650019 ◽  
Author(s):  
K. L. QU ◽  
X. H. Wang ◽  
Z. K. Wang
Keyword(s):  
Wear Resistance ◽  
Laser Beam ◽  
Boron Carbide ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Laser Beam Melting ◽  
Black Flower

In situ synthesized VC–VB particles reinforced Fe-based composite coatings were produced by laser beam melting mixture of ferrovanadium (Fe–V) alloy, boron carbide (B4C), CaF2 and Fe-based self-melting powders. The results showed that VB particles with black regular and irregular blocky shape and VC with black flower-like shape were uniformly distributed in the coatings. The type, amount, and size of the reinforcements were influenced by the content of FeV[Formula: see text]40 and B4C powders. Compared to the substrate, the hardness and wear resistance of the composite coatings were greatly improved.

In situ measurement of part geometries in layer images from laser beam melting processes

2018 ◽  
Vol 4 (2) ◽  
pp. 155-165
Author(s):  
Joschka zur Jacobsmühlen ◽  
Jan Achterhold ◽  
Stefan Kleszczynski ◽  
Gerd Witt ◽  
Dorit Merhof
Keyword(s):  
Laser Beam ◽  
In Situ Measurement ◽  
Laser Beam Melting

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.

Understanding the phase formation kinetics of nano-crystalline kesterite deposited on mesoscopic scaffolds via in situ multi-wavelength Raman-monitored annealing

2016 ◽  
Vol 18 (42) ◽  
pp. 29435-29446 ◽  
Author(s):  
Zhuoran Wang ◽  
Samir Elouatik ◽  
George P. Demopoulos
Keyword(s):  
Real Time ◽  
Phase Formation ◽  
Formation Kinetics ◽  
Nano Crystalline ◽  
Multi Wavelength ◽  
Real Time Information ◽  
Kinetics Of ◽  
Time Information ◽  
Annealing Method

The in situ Raman monitored annealing method is developed in this work to provide real-time information on phase formation and crystallinity evolution of kesterite deposited on a TiO2 mesoscopic scaffold.

Laboratory Experience with In Situ Detection of Beryllium in Biological Specimens

1968 ◽  
Vol 22 (6) ◽  
pp. 758-760 ◽  
Author(s):  
Solomon F. Brokeshoulder ◽  
Farrel R. Robinson
Keyword(s):  
Chemical Analysis ◽  
Laser Beam ◽  
Tissue Thickness ◽  
Laboratory Experience ◽  
Laser Microprobe ◽  
Medium Concentration ◽  
Embedding Medium ◽  
In Situ Detection

Suitable microspectrochemical techniques have been devised for the laser microprobe made by the Jarrell—Ash Co. to detect beryllium in histologic structures. Density and type of tissue, thickness of the specimen, character of the embedding medium, concentration and localization of the element, and the penetrability of the laser beam must be considered in preparing biological specimens for chemical analysis by the microspectrochemical technique. Advantages of this technique are the identification of specific elements in situ and the correlation of the presence of the element with a specific histologic structure.

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