Laser Surface Texturing of Stainless Steel − Effect of Pulse Duration on Texture's Morphology and Frictional Response

2018 ◽  
Vol 21 (3) ◽  
pp. 1801016 ◽  
Author(s):  
Junjie Zhang ◽  
Dinghuai Yang ◽  
Andreas Rosenkranz ◽  
Jianguo Zhang ◽  
Liang Zhao ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Pulse Duration ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing

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 Laser Surface Texturing and Characterization of Austenitic Stainless Steel for the Improvement of Its Surface Properties

2021 ◽  
Author(s):  
Yassmin Seid Ahmed ◽  
Jose Mario Paiva ◽  
Fred L. Amorim ◽  
Ricardo D. Torres ◽  
Wagner de Rossi ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Textured Surfaces ◽  
Aisi 304 ◽  
Steel Aisi

Abstract A detailed investigation of laser textured surfaces produced on austenitic stainless steel (AISI 304) was carried out. Three different textures were produced by a Ti sapphire laser. The processed surfaces were characterized by surface morphology, phase structure, micro-hardness, surface roughness, and wettability. A ball-on-disk tribometer was used to study the tribological performance of both untextured and textured samples. The experimental observations demonstrate that laser surface texturing (LST) improves both surface wettability and surface roughness. Average surface roughness (Ra) was increased by 350% and the contact angle was reduced from 43° to 22°. The textured surfaces show a lower coefficient of friction and better wear resistance than the untextured surface. Out of the investigated patterns, the square textures exhibited a maximum reduction of 68% in the friction coefficient and a 50% lower wear rate.

scholarly journals Vacuum brazing of titanium alloy to stainless steel enhance by fiber laser surface texturing

2021 ◽  
Vol 15 (4) ◽  
pp. 8601-8607
Author(s):  
A.J. Sulaiman H. ◽  
M. H. Aiman ◽  
M. Ishak ◽  
M. M. Quazi ◽  
T. Zaharinie ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Fiber Laser ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Stainless Steel Surface ◽  
Periodic Patterns ◽  
Vacuum Brazing ◽  
Joining Strength

A method for improving the brazing joining strength of Titanium alloy/Stainless steel fabricated through fibre laser surface texturing is introduced because it is a simple process that does not require the fabrication of complicated interlayers. However, previous research shows that a milimeter scale was fabricated by surface modification for dissimilar brazing join, yielding insignificant results and limiting the application and degree of enhancement. Fiber laser ablation was used in this study to create microscale periodic patterns (grooves) on a stainless steel surface. No defect or damage induced during laser surface texturing process. The groove dimension was tunable by controlling the laser parameters. Vacuum brazing of Ti6Al4V to 316L stainless steel with surface texturing, the average joint strength was 22.1 MPa, 34% of increase of joining strength compared to unprocessed flat surface. The combination of laser surface texturing and brazing proven effectively on joining strength enhancement.

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