9 documents found, page 1 of 1
Assessment of microstructure of alloy Inconel 686 dissimilar weld claddings
Silva, Cleiton C.; Afonso, Conrado Ramos Moreira; Ramirez, Antonio Jose; Motta, Marcelo Ferreira; Miranda, Hélio Cordeiro de; Farias, Jesualdo PereiraWeld overlay with Ni-based superalloys is an important option for industrial applications. New alloys have been developed to assure desirable characteristics such as corrosion resistance. The Inconel 686 superalloy was developed with a higher Cr and Mo content in order to improve its resistance to corrosion. However, information in the literature about the solidification and weld microstructure of this alloy is...
Austenitic and ferritic stainless steel dissimilar weld metal evaluation for th...
Silva, Cleiton C.; Miranda, Hélio Cordeiro de; Sant’Ana, Hosiberto Batista de; Farias, Jesualdo PereiraThe current study presents some fundamental observations on the effects of the welding heat input in the chemical composition, microstructure, hardness and petroleum corrosion resistance of the fusion zone, formed by the AWS E309MoL austenitic stainless steel covered electrode and the AISI 410S ferritic stainless steel, being a dissimilar welding procedure. Such welding configurations are widely used as an over...
Automatic microstructural characterization and classification using artificial ...
Nunes, Thiago M.; Albuquerque, Victor Hugo Costa de; Papa, João Paulo; Silva, Cleiton C.; Normando, Paulo Garcia; Moura, Elineudo Pinho deSecondary 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 c00 and d phases. This work presents a new application and evaluation of artificial intelligent techniques to classif...
Microstructure, hardness and petroleum corrosion evaluation of 316L/AWS E309MoL...
Silva, Cleiton C.; Miranda, Hélio Cordeiro de; Sant'Ana, Hosiberto Batista de; Farias, Jesualdo PereiraThe current work presents some observations about the effect of welding heat input on the microstructure, hardness and corrosion resistance of AWS E309MoL-16 weld metal, diluted with AISI 316L austenitic stainless steel plates. Such welds are widely used during overlay of equipment in the petroleum and gas industries. Results show that the welds contained δ- ferrite varying between vermicular to lathy morpholog...
Effect of nonmetallic inclusion and banding on the success of the two-layer tem...
Albuquerque, Victor Hugo Costa de; Silva, Cleiton C.; Moura, Cícero R.O.; Aguiar, Willys Machado; Farias, Jesualdo PereiraThis work evaluated the effect of banding and nonmetallic inclusions in AISI 4140 steel on the HAZ toughness using the two-layer temper bead technique. The results showed that the amount and the length of the nonmetallic inclusions can negatively influence the toughness. There was a significant difference between the toughness of the materials with banding in the as-welded state and the heat treated. In conclus...
High-temperature hydrogen sulfide corrosion on the heat-affected zone of the AI...
Silva, Cleiton C.; Machado, João Paulo Sampaio Eufrásio; Sobral-Santiago, Ana Vládia Cabral; Sant'Ana, Hosiberto Batista de; Farias, Jesualdo PereiraThe aim of this study was to evaluate the effect of welding on the corrosion resistance of the heat-affected zone (HAZ) of the AISI 444 ferritic stainless steel in medium containing Venezuelan heavy oil. AISI 444 steel plates were welded through the use of three levels of welding heat input (4, 6 and 8 kJ/cm). Samples were extracted from the welded plates and thermally treated in three different temperatures (2...
Automatic segmentation of the secondary austenite-phase island precipitates in ...
Albuquerque, Victor H. C.; Nakamura, Rodrigo Y. M. [UNESP]; Papa, Joao P. [UNESP]; Silva, Cleiton C.; Tavares, Joao Manuel R. S.; Tavares, JMRSMade available in DSpace on 2020-12-10T19:33:12Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-01-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Cearense Foundation for the Support of Scientific and Technological Development (FUNCAP); UNIFOR; Duplex and superduplex stainless steels are class of materials of a high ...
Precipitates segmentation from scanning electron microscope images through mach...
Papa, João Paulo [UNESP]; Pereira, Clayton R. [UNESP]; De Albuquerque, Victor H. C.; Silva, Cleiton C.; Falcão, Alexandre X.; Tavares, João Manuel R. S.Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:25:54Z No. of bitstreams: 0; Made available in DSpace on 2014-05-27T11:25:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-06-02; The presence of precipitates in metallic materials affects its durability, resistance and mechanical properties. Hence, its automatic identification by image processing and machine lea...
Automatic segmentation of the secondary austenite-phase island precipitates in ...
Albuquerque, Victor H. C.; Nakamura, Rodrigo Y. M. [UNESP]; Papa, João Paulo [UNESP]; Silva, Cleiton C.; Tavares, João Manuel R. S.Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:26:23Z No. of bitstreams: 0; Made available in DSpace on 2014-05-27T11:26:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-02-13; Duplex and superduplex stainless steels are class of materials of a high importance for engineering purposes, since they have good mechanical properties combination and also are very r...