Laser surface alloying of Gr22 ferritic steel with Ni(Al): Effect of processing parameters on the microstructure and high temperature performance

Verdi, Davide; Múnez, C.J.; Sevillano, F.; Poza, P.

doi:10.1016/j.jmatprotec.2013.05.014

Cited by 3 publications

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The BC achieved by VPS technique shows low mechanical adhesion, pores, and imperfections. Laser surface treatments of the BC permits to obtain higher superficial integrity, with lower porosity, sporadic imperfections and a very hard metallurgical bond [4]. In this perspective, this research aims to observe the influence of the laser texturing when combined with laser treatment, evaluating the influence of laser parameters on texturing and treating.…”

Section: Introductionmentioning

confidence: 99%

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

Teleginski

Chagas

Oliveira

et al. 2014

MSF

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%