Optical methods of on-line diagnostics of processes of the Nickel alloy powder consolidation in the layer-by-layer laser melting technology

2019 ◽  
Author(s):  
Yuri N. Zavalov ◽  
Alexander V. Dubrov ◽  
Vladimir D. Dubrov
Keyword(s):  
Nickel Alloy ◽  
Alloy Powder ◽  
Optical Methods ◽  
Layer By Layer ◽  
Laser Melting ◽  
Powder Consolidation ◽  
Melting Technology ◽  
On Line

scholarly journals Modelling of Selective Laser Melting Process of Quartz Glass at Elevated Temperatures

2021 ◽  
Vol 248 ◽  
pp. 01001
Author(s):  
M.A. Gridnev ◽  
R.S. Khmyrov ◽  
A.V. Gusarov
Keyword(s):  
Selective Laser Melting ◽  
Quartz Glass ◽  
Elevated Temperatures ◽  
Melting Process ◽  
Coupled Processes ◽  
Powder Layer ◽  
Layer By Layer ◽  
Laser Melting ◽  
Material Quality ◽  
Powder Consolidation

Selective laser melting (SLM) to date is the method of additive manufacturing allowing fabricating products from powder layer-by-layer according to a 3D model. However, when applying this method to fragile materials, parts crack while fabricating due to high temperatures. Quartz glass is a promising material for fabricating products by SLM without cracks due to a low thermal expansion. However, quality of fabricated material differs from the fused cast ones. This article aims to test the method of SLM with preheating to improve the material quality. Experiments on single track formation in SLM are analysed by modelling the coupled processes of heat transfer and powder consolidation in the laser-interaction zone. The mathematical model is validated by the experiments. It is shown that the preheating can improve the material quality and increase the process productivity but overheating may result in undesirable crystallization.

scholarly journals Mitigation of anisotropic fatigue in nickel alloy 718 manufactured via selective laser melting

2019 ◽  
Vol 182 ◽  
pp. 108095 ◽  
Author(s):  
Volodymyr P. Sabelkin ◽  
Gregory R. Cobb ◽  
Travis E. Shelton ◽  
Megan N. Hartsfield ◽  
David J. Newell ◽  
...  
Keyword(s):  
Nickel Alloy ◽  
Selective Laser Melting ◽  
Alloy 718 ◽  
Laser Melting

scholarly journals Probable Ways of Hardening in the Metal Structure Obtained by Selective Laser Melting Technology

2021 ◽  
Vol 1079 (3) ◽  
pp. 032042
Author(s):  
V I Alekseev ◽  
B K Barahtin ◽  
A S Zhukov ◽  
G A Panova ◽  
S G Petrova ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Metal Structure ◽  
Laser Melting ◽  
Melting Technology

scholarly journals The Influence of Exposure Energy Density on Porosity and Microhardness of the SLM Additive Manufactured Elements

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2304 ◽  
Author(s):  
Janusz Kluczyński ◽  
Lucjan Śnieżek ◽  
Krzysztof Grzelak ◽  
Janusz Mierzyński
Keyword(s):  
Computer Aided Design ◽  
Complex Geometry ◽  
Final Analysis ◽  
Machine Building ◽  
Layer By Layer ◽  
Laser Melting ◽  
Measurement Results ◽  
Computer Aided ◽  
Exposure Energy ◽  
Aided Design

Selective laser melting (SLM) is an additive manufacturing technique. It allows elements with very complex geometry to be produced using metallic powders. A geometry of manufacturing elements is based only on 3D computer-aided design (CAD) data. The metal powder is melted selectively layer by layer using an ytterbium laser. This paper contains the results of porosity and microhardness analysis made on specimens manufactured during a specially prepared process. Final analysis helped to discover connections between changing hatching distance, exposure speed and porosity. There were no significant differences in microhardness and porosity measurement results in the planes perpendicular and parallel to the machine building platform surface.

scholarly journals Fracture Toughness of Hybrid Components with Selective Laser Melting 18Ni300 Steel Parts

2018 ◽  
Vol 8 (10) ◽  
pp. 1879 ◽  
Author(s):  
Luis Santos ◽  
Joel de Jesus ◽  
José Ferreira ◽  
José Costa ◽  
Carlos Capela
Keyword(s):  
Fracture Toughness ◽  
Selective Laser Melting ◽  
Compact Tension ◽  
Powder Materials ◽  
Layer By Layer ◽  
Laser Melting ◽  
Conventional Steel ◽  
Scan Rate ◽  
Aisi H13 ◽  
3D Printed

Selective Laser Melting (SLM) is currently one of the more advanced manufacturing and prototyping processes, allowing the 3D-printing of complex parts through the layer-by-layer deposition of powder materials melted by laser. This work concerns the study of the fracture toughness of maraging AISI 18Ni300 steel implants by SLM built over two different conventional steels, AISI H13 and AISI 420, ranging the scan rate between 200 mm/s and 400 mm/s. The SLM process creates an interface zone between the conventional steel and the laser melted implant in the final form of compact tension (CT) samples, where the hardness is higher than the 3D-printed material but lower than the conventional steel. Both fully 3D-printed series and 3D-printed implants series produced at 200 mm/s of scan rate showed higher fracture toughness than the other series built at 400 mm/s of scan rate due to a lower level of internal defects. An inexpressive variation of fracture toughness was observed between the implanted series with the same parameters. The crack growth path for all samples occurred in the limit of interface/3D-printed material zone and occurred between laser melted layers.

scholarly journals Optical Methods for On-line Quality Assurance of Welding Processes in Nuclear Steam Generators

10.5772/15579 ◽  
2011 ◽  
Author(s):  
Adolfo Cobo ◽  
Jesus Ma ◽  
David Solana ◽  
Alfonso Alvarez-de-Miranda ◽  
Pilar-Beatriz Garcia-Allende ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Optical Methods ◽  
Steam Generators ◽  
On Line ◽  
Welding Processes
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