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Automatic microstructural characterization and classification using artificial ...
Thiago M. Nunes; Victor Hugo C. de Albuquerque; João P. Papa; Cleiton C. Silva; Paulo G. Normando; Elineudo P. Moura; João Manuel R. S. TavaresSecondary phases such as Laves and carbides are formed during the final solidification stages of nickel based superalloy coatings deposited during the gas tungsten arc welding cold wire process. However, when aged at high temperatures, other phases can precipitate in the microstructure, like the γ″ and δ phases. This work presents a new application and evaluation of artificial intelligent techni...
Thermal Aging Effects on the microstructure of Nb-bearing nickel based superall...
Victor Hugo C. de Albuquerque; Cleiton Carvalho Silva; Paulo G. Normando; Elineudo P. Moura; João Manuel R. S. TavaresSecondary phases such as Laves and carbides are formed during the final stages of solidification of the nickel based superalloy Inconel 625 coatings deposited during the gas tungsten arc welding (GTAW) cold wire process. However, when aged at high temperatures, other phases can precipitate in the microstructure, like the ´´ and  phases. The aim of this work was to evaluate the differen...
Nondestructive Characterization and Evaluation of Embrittlement Kinetics and El...
Vera Lúcia de Araújo Freitas; Paulo G. Normando; Victor Hugo C. de Albuquerque; Edgard de Macedo Silva; Antonio Almeida Silva; João Manuel R. S. TavaresIn this work, an experimental study was carried out to evaluate the potential of the ultrasonic technique, with ultrasonic velocity and attenuation measurements, to assess the heat aging effects on duplex stainless steel SAF 2205, at temperatures of 425 ºC and 475 ºC for time periods of 12 h, 24 h, 50 h, 100 h and 200 h, as well as in the as received state of the material. Velocity measurements were calculated ...
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