Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques
Secondary 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 mi...
| Autores: | ; ; ; ; |
|---|---|
| Tipo de documento: | Artigo |
| Estado: | Published version |
| Data de publicação: | 2012 |
| País: | Brasil |
| Recursos: | UFC |
| Repositório: | Repositório Institucional da Universidade Federal do Ceará (UFC) |
| Idioma: | Inglês |
| OAI Identifier: | oai:repositorio.ufc.br:riufc/66208 |
| Acesso em linha: | http://www.repositorio.ufc.br/handle/riufc/66208 |
| Nível de acesso: | Acesso aberto |
| Palavra-chave: | F. Microstructure G. Nondestructive testing (NDT) G. Ultrasonic analysis |
| _version_ | 1878756754676776960 |
|---|---|
| author | Albuquerque, Victor Hugo Costa de |
| author2 | Silva, Cleiton Carvalho Normando, Paulo Garcia Moura, Elineudo Pinho de Tavares, João Manuel Ribeiro da Silva |
| author2_role | author author author author |
| author_browse | Albuquerque, Victor Hugo Costa de Moura, Elineudo Pinho de Normando, Paulo Garcia Silva, Cleiton Carvalho Tavares, João Manuel Ribeiro da Silva |
| author_facet | Albuquerque, Victor Hugo Costa de Silva, Cleiton Carvalho Normando, Paulo Garcia Moura, Elineudo Pinho de Tavares, João Manuel Ribeiro da Silva |
| author_role | author |
| bitstream_url_str_mv | http://repositorio.ufc.br/bitstream/riufc/66208/2/license.txt http://repositorio.ufc.br/bitstream/riufc/66208/1/2012_art_vhcalbuquerque.pdf |
| collection | Repositório Institucional da Universidade Federal do Ceará (UFC) |
| description | Secondary 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 c00 and d phases. The aim of this work was to evaluate the different phases formed during thermal aging of the as-welded material through ultrasound inspection, as well as the influence of background echo and backscattered ultrasound signals on the computational classification of the microstructures involved. The experimental conditions employed an aging temperature of 650 C for 10, 100 and 200 h. The ultrasound signals were acquired using transducers with frequencies of 4 and 5 MHz and then processed to determine the ultrasound velocity and attenuation, as well as to study the background echo and backscattered signals produced by wave propagation. Both signal types were used to study the effectiveness and speed for classifying the secondary phases, using detrended fluctuation analysis and the Hurst method in the signal pre-processing and the Karhunen–Loève Transform in the classification of the microstructures. The ultrasound signals and the signal processing tools used were considered sufficiently sensitive, fast and accurate in the detection and classification of the microstructures in the aswelded and aged Inconel 625 alloy using this nondestructive technique. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | BR_65b6813dd7f65b032febf37cf6b964c5 |
| institution | UFC |
| instname_str | Universidade Federal do Ceará (UFC) |
| language | eng |
| network_acronym_str | BR |
| network_name_str | Brasil |
| oai_identifier_str | oai:repositorio.ufc.br:riufc/66208 |
| publishDate | 2012 |
| publishDateSort | 2012 |
| publisher | Materials & Design |
| publisherStr | Materials & Design |
| reponame_str | Repositório Institucional da Universidade Federal do Ceará (UFC) |
| spelling | Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques Albuquerque, Victor Hugo Costa de Silva, Cleiton Carvalho Normando, Paulo Garcia Moura, Elineudo Pinho de Tavares, João Manuel Ribeiro da Silva F. Microstructure G. Nondestructive testing (NDT) G. Ultrasonic analysis Secondary 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 c00 and d phases. The aim of this work was to evaluate the different phases formed during thermal aging of the as-welded material through ultrasound inspection, as well as the influence of background echo and backscattered ultrasound signals on the computational classification of the microstructures involved. The experimental conditions employed an aging temperature of 650 C for 10, 100 and 200 h. The ultrasound signals were acquired using transducers with frequencies of 4 and 5 MHz and then processed to determine the ultrasound velocity and attenuation, as well as to study the background echo and backscattered signals produced by wave propagation. Both signal types were used to study the effectiveness and speed for classifying the secondary phases, using detrended fluctuation analysis and the Hurst method in the signal pre-processing and the Karhunen–Loève Transform in the classification of the microstructures. The ultrasound signals and the signal processing tools used were considered sufficiently sensitive, fast and accurate in the detection and classification of the microstructures in the aswelded and aged Inconel 625 alloy using this nondestructive technique. Materials & Design ALBUQUERQUE, V. H. C. de et al. Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques. Materials & Design, [s.l.] v. 36, p. 337-347, 2012. 0264-1275 http://www.repositorio.ufc.br/handle/riufc/66208 |
| spellingShingle | Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques Albuquerque, Victor Hugo Costa de F. Microstructure G. Nondestructive testing (NDT) G. Ultrasonic analysis |
| status_str | publishedVersion |
| title | Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques |
| title_full | Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques |
| title_fullStr | Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques |
| title_full_unstemmed | Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques |
| title_short | Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques |
| title_sort | Thermal aging effects on the microstructure of Nb-bearing nickel based superalloy weld overlays using ultrasound techniques |
| topic | F. Microstructure G. Nondestructive testing (NDT) G. Ultrasonic analysis |
| topic_facet | F. Microstructure G. Nondestructive testing (NDT) G. Ultrasonic analysis |
| url | http://www.repositorio.ufc.br/handle/riufc/66208 |