Numerical modeling of powder stream in extreme high-speed linear laser material deposition

2021 ◽  
Author(s):  
Chong Xie ◽  
Keyan Wang ◽  
Ziqiang Pi ◽  
Chengxin Li ◽  
Xianqing Yin
Keyword(s):  
Numerical Modeling ◽  
High Speed ◽  
Laser Material ◽  
Material Deposition ◽  
Linear Laser

scholarly journals Extreme High-Speed Laser Material Deposition (EHLA) of AISI 4340 Steel

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 778 ◽  
Author(s):  
Tianci Li ◽  
Lele Zhang ◽  
Gregor Gilles Pierre Bultel ◽  
Thomas Schopphoven ◽  
Andres Gasser ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Speed ◽  
Thermal Evolution ◽  
Laser Material ◽  
Aisi 4340 Steel ◽  
Material Deposition ◽  
Static Mechanical ◽  
Static Mechanical Properties ◽  
Conventional Laser ◽  
Aisi 4340

A variant of conventional laser material deposition (LMD), extreme high-speed laser material deposition (German acronym: EHLA) is characterized by elevated process speeds of up to 200 m/min, increased cooling rates, and a significantly reduced heat affected zone. This study focuses on the feasibility of using EHLA to apply material onto Fe-based substrate materials with AISI 4340 as a filler material. We studied how three different build-up strategies—consisting of one, three, and five consecutive deposited layers and hence, different thermal evolutions of the build-up volume—influence the metallurgical characteristics such as microstructure, porosity, hardness, and static mechanical properties. We propose a thermo-metallurgical scheme to help understand the effects of the build-up strategy and the thermal evolution on the microstructure and hardness. The tensile strength of the build-up volume was determined and is higher than the ones of forged AISI 4340 material.

scholarly journals EHLA: Extreme High-Speed Laser Material Deposition

2017 ◽  
Vol 14 (4) ◽  
pp. 26-29 ◽  
Author(s):  
Thomas Schopphoven ◽  
Andres Gasser ◽  
Gerhard Backes
Keyword(s):  
High Speed ◽  
Laser Material ◽  
Material Deposition

scholarly journals EHLA: Extreme High-Speed Laser Material Deposition

2017 ◽  
Vol 14 (3) ◽  
pp. 45-45 ◽  
Author(s):  
Thomas Schopphoven ◽  
Andres Gasser ◽  
Gerhard Backes
Keyword(s):  
High Speed ◽  
Laser Material ◽  
Material Deposition

Development of a high-speed laser material deposition process for additive manufacturing

2021 ◽  
Vol 33 (1) ◽  
pp. 012021
Author(s):  
Jonathan Schaible ◽  
Lennart Sayk ◽  
Thomas Schopphoven ◽  
Johannes Henrich Schleifenbaum ◽  
Constantin Häfner
Keyword(s):  
Additive Manufacturing ◽  
High Speed ◽  
Deposition Process ◽  
Laser Material ◽  
Material Deposition

scholarly journals Investigation of the coating of hydrodynamic plain bearing contact surfaces by means of Extreme High-Speed Laser Material Deposition (EHLA)

2021 ◽  
Vol 1097 (1) ◽  
pp. 012016
Author(s):  
Koß Stephan ◽  
Achill Holzer ◽  
Sandra Megahed ◽  
Stephan Ziegler ◽  
Johannes Henrich Schleifenbaum ◽  
...  
Keyword(s):  
High Speed ◽  
Plain Bearing ◽  
Laser Material ◽  
Material Deposition ◽  
Bearing Contact ◽  
Contact Surfaces

scholarly journals Statistical/Numerical Model of the Powder-Gas Jet for Extreme High-Speed Laser Material Deposition

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 416 ◽  
Author(s):  
Thomas Schopphoven ◽  
Norbert Pirch ◽  
Stefan Mann ◽  
Reinhart Poprawe ◽  
Constantin Leon Häfner ◽  
...  
Keyword(s):  
Numerical Model ◽  
Laser Beam ◽  
High Speed ◽  
Process Model ◽  
Gas Jet ◽  
Particle Trajectories ◽  
Laser Material ◽  
Melt Pool ◽  
Material Deposition ◽  
New Variant

Extreme high-speed laser material deposition, known by its German acronym EHLA, is a new variant of laser material deposition (LMD) with powdered additives. This variant’s process control is unlike that of LMD, where the powder melts as it contacts the melt pool. In the EHLA process, the laser beam melts the powder above the surface of the substrate to deliver a liquid to the melt pool. At a given intensity distribution in a laser beam, the heating of powder particles in the beam path depends largely on the three-dimensional powder particle density distribution (PDD) and the relative position within the laser beam caustic. As a key element of a comprehensive numerical process model for EHLA, this paper presents a statistical/numerical model of the powder-gas jet, as previously published in Experimentelle und modelltheoretische Untersuchungen zum Extremen Hochgeschwindigkeits-Laserauftragschweißen. The powder-gas jet is characterized experimentally and described with a mathematical model. This serves to map the PDD of the powder-gas flow—and particularly the particle trajectories for different grain fractions—as well as the powder mass flows and carrier and inert gas settings, to a theoretical model. The result is a numerical description of the particle trajectories that takes into account the measured particle size distribution with calculations made on the assumption of a constant particle velocity and linear trajectories of the particles.

Investigations on ultra-high-speed laser material deposition as alternative for hard chrome plating and thermal spraying

2016 ◽  
Vol 28 (2) ◽  
pp. 022501 ◽  
Author(s):  
Thomas Schopphoven ◽  
Andres Gasser ◽  
Konrad Wissenbach ◽  
Reinhart Poprawe
Keyword(s):  
High Speed ◽  
Thermal Spraying ◽  
Laser Material ◽  
Chrome Plating ◽  
Ultra High Speed ◽  
Material Deposition ◽  
Hard Chrome
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