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Previous issue date: 2015 / CAPES / Visando a aplicação do aço UNS S32304 em embalados para transporte de material radioativo, amostras soldadas por processo TIG, com diferentes gases de proteção, foram submetidas a tratamentos térmicos nas temperaturas de 475°C, 600°C e 750°C por 8 horas, seguidas de resfriamento ao ar, a fim de
analisar o efeito de temperaturas críticas no perfil de tensões residuais e microestrutura. A difratometria de raios X foi utilizada para determinação das tensões residuais, em diferentes condições (amostras como recebidas e apenas tratadas termicamente) e o perfil de tensões residuais total das amostras soldadas é apresentado para cada fase (austenita e ferrita). As tensões residuais das fases foram determinadas pela técnica sen2ψ, utilizando um difratômetro com fonte de radiação CuKα (<λ> = 0,1542 nm) para a fase
austenita e radiação CrKα (<λ> = 0,2291 nm) para a fase ferrita. Avaliaram-se ainda o teor de ferrita, microdureza e microestrutura dos materiais, os quais foram relacionados aos perfis obtidos. Verificou-se que tanto a temperatura quanto a variação do gás de proteção influenciam no perfil de tensões para as
diferentes fases deste aço. / Aiming the implementation of duplex UNS S32304 steel as a packed for radioactive material transport, TIG welded samples, with different shielding gas, were subjected to heat treatments at different temperatures, 475 °C, 600 °C and 750 °C, for 8 hours followed by air cooling, in order to examine the critical temperatures effect on the steel residual stress profile and microestruture. The X-ray diffraction was used as a non-destructive technique to determine the residual stresses at different conditions (samples received and only heat treated) and the profile of the total residuals stresses welded samples is analysed for each phase (austenite and ferrite). The residual stresses of the phases was determined by sen2ψ. For austenite phase it was used CuKα radiation source (<̅ > = 0.1542 nm) and for the ferrite phase it was used CrKα radiation (<̅> = 0.2291 nm). It was also measured the ferrite contents, Vickers microhardness and microstructure of the materials was investigated. These results were related to the obtained profiles. It was found that both, the temperature and the variation of the shielding gas, influence on the stresses profile for the different phases in the steel.
| Identifer | oai:union.ndltd.org:IBICT/oai:dspace2.ufes.br:10/1715 |
| Date | 13 May 2015 |
| Creators | Machado, Caruline de Souza Carvalho |
| Contributors | Macêdo, Marcelo Camargo Severo de, Luz, Temistocles de Sousa, Martinez, Luis Gallego, Orlando, Marcos Tadeu D’Azeredo |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | text |
| Source | reponame:Repositório Institucional da UFES, instname:Universidade Federal do Espírito Santo, instacron:UFES |
| Rights | info:eu-repo/semantics/openAccess |
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