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.

scholarly journals Does laser surface texturing really have a negative impact on the fatigue lifetime of mechanical components?

Friction ◽  
2021 ◽  
Author(s):  
Chia-Jui Hsu ◽  
Andreas Stratmann ◽  
Simon Medina ◽  
Georg Jacobs ◽  
Frank Mücklich ◽  
...  
Keyword(s):  
Boundary Lubrication ◽  
Surface Texturing ◽  
Contact Stresses ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Wear Loss ◽  
Textured Surface ◽  
Periodic Patterns ◽  
Rolling Bearings ◽  
Fatigue Lifetime

AbstractLaser surface texturing (LST) has been proven to improve the tribological performance of machine elements. The micro-scale patterns manufactured by LST may act as lubricant reservoirs, thus supplying oil when encountering insufficient lubrication. However, not many studies have investigated the use of LST in the boundary lubrication regime, likely due to concerns of higher contact stresses that can occur with the increasing surface roughness. This study aims to examine the influence of LST on the fatigue lifetime of thrust rolling bearings under boundary lubrication. A series of periodic patterns were produced on the thrust rolling bearings, using two geometrically different designs, namely cross and dimple patterns. Base oil ISO VG 100 mixed with 0.05 wt% P of zinc dialkyldithiophosphate (ZDDP) was supplied. The bearings with cross patterns reduce the wear loss by two orders of magnitude. The patterns not only retain lubricant in the textured pockets but also enhance the formation of an anti-wear tribofilm. The tribofilm generation may be improved by the higher contact stresses that occur when using the textured surface. Therefore, in contrast to the negative concerns, the ball bearings with cross patterns were instead found to increase the fatigue life by a factor of three.

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.

Study on Fiber Laser Surface Texturing Technology for the Roller

Applied laser ◽  
2011 ◽  
Vol 31 (6) ◽  
pp. 451-455
Author(s):  
张瑞华 Zhang Ruihua ◽  
韩帅 Han Shuai ◽  
梁海姣 Liang Haijiao ◽  
李宝磊 Li Baolei ◽  
尹燕 Yin Yan ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing
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