Improving fluid retention properties of 316L stainless steel using nanosecond pulsed laser surface texturing

2020 ◽  
Vol 32 (4) ◽  
pp. 042018
Author(s):  
Mahmood Al Bashir ◽  
Rajeev Nair ◽  
Martina M. Sanchez ◽  
Anil Mahapatro
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Surface Texturing ◽  
Pulsed Laser ◽  
Fluid Retention ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Nanosecond Pulsed Laser

Laser surface texturing of Ti6Al4V alloy, stainless steel and aluminium silicon alloy

2018 ◽  
Vol 461 ◽  
pp. 117-123 ◽  
Author(s):  
Andrzej Grabowski ◽  
Maria Sozańska ◽  
Marcin Adamiak ◽  
Mirosława Kępińska ◽  
Tomasz Florian
Keyword(s):  
Stainless Steel ◽  
Surface Texturing ◽  
Laser Surface ◽  
Ti6al4v Alloy ◽  
Laser Surface Texturing ◽  
Silicon Alloy

Interface Evaluation of MCrAlY Powder Bond Coat on 316 SS Processed with Laser Irradiation

2014 ◽  
Vol 802 ◽  
pp. 409-414 ◽  
Author(s):  
Viviane Teleginski ◽  
Daniele C. Chagas ◽  
Luis Gustavo de Oliveira ◽  
Getúlio de Vasconcelos
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Optical Microscopy ◽  
Bond Coat ◽  
Surface Texturing ◽  
Ceramic Coatings ◽  
Metallic Substrate ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
First Case

As aircraft and thermoelectric turbine blades work in aggressive environments (high temperatures and pressures), they are exposed to oxidation reactions. Ceramic coatings are employed to increase the turbine work temperature (improving its performance) and a bond coat (BC), base of particulate material of Ni-Cr-Al powders, which assure a good adhesion, gradual decrease in thermal expansion coefficient between the metallic substrate and the ceramic top coat, avoiding the oxidation effect in the metallic substrate. This research aims the study and comparison of two different deposition process routes of particulate materials of BC (MCrAlY) on AISI 316 stainless steel substrate. In the first case, the BC powder was pre-deposited by segregation method and irradiated by a CO2laser beam. In the second case, laser surface texturing was done on the stainless steel surface by a Yb: fiber laser beam, the BC was deposited by the same method, and further, irradiated by a CO2laser beam. The main focus of this work was to evaluate the resulting interface for both mentioned cases. For this propose, characterizations were made using the techniques of optical microscopy and roughness measurements. In the first case, homogenous layers of bond coat were obtained. Optical microscopy suggest the formation of a metallurgic bonding between the substrate and the MCrAlY. For the laser surface texturing, the surface roughness can be adjusted by the laser beam parameters.

scholarly journals Soft Computing Techniques for Laser-Induced Surface Wettability Control

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2379
Author(s):  
Gennaro Salvatore Ponticelli ◽  
Flaviana Tagliaferri ◽  
Silvio Genna ◽  
Simone Venettacci ◽  
Oliviero Giannini ◽  
...  
Keyword(s):  
Imperfect Information ◽  
Laser Scanning ◽  
Surface Texturing ◽  
Scanning Speed ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Laser Source ◽  
Nanosecond Pulsed Laser ◽  
Soft Computing Techniques ◽  
Modelling Assumptions

Making decisions and deducing control actions in manufacturing environments requires considering many uncertainties. The ability of fuzzy logic to incorporate imperfect information into a decision model has made it suitable for the optimization of both productivity and final quality. In laser surface texturing for wettability control, in fact, these aspects are governed by a complex interaction of many process parameters, ranging from those connected with the laser source to those concerning the properties of the processed material. The proposed fuzzy-based decision approach overcomes this difficulty by taking into account both the random error, associated with the process variability, and the systematic error, due to the modelling assumptions, and propagating such sources of uncertainties at the input level to the output one. In this work, the laser surface texturing was carried out with a nanosecond-pulsed laser on the surfaces of AISI 304 samples, changing the laser scanning speed, the hatch distance, the number of repetitions, and the scanning pattern. A significant change of the contact angle in the range 24–121° is observed due to the produced textures. The fuzzy maps highlight the inherent uncertainty due to both the laser texturing process and the developed model.

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