Previsão de vida remanescente de aço ferrítico 2,25Cr-1Mo envelhecido em serviço
Materials for long time, high temperature and pressure applications must be resistant to creep and oxidation. For this purpose, Cr-Mo ferritic steels are widely used, which makes important the investigation of their microstructural changes and creep behaviors. The aim of this research is evaluate li...
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2017 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio de Janeiro (UFRJ) |
| Repositorio: | Repositório Institucional da UFRJ |
| Idioma: | portugués |
| OAI Identifier: | oai:pantheon.ufrj.br:11422/9281 |
| Acceso en línea: | http://hdl.handle.net/11422/9281 |
| Access Level: | acceso abierto |
| Palabra clave: | Engenharia metalúrgica e de materiais Aços 2,25Cr-1Mo Previsão de vida em fluência CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
| Sumario: | Materials for long time, high temperature and pressure applications must be resistant to creep and oxidation. For this purpose, Cr-Mo ferritic steels are widely used, which makes important the investigation of their microstructural changes and creep behaviors. The aim of this research is evaluate life prediction parametric methods using creep data obtained from 2.25 Cr-1Mo steel in two different conditions: as received and aged in service at 515oC and 12,26 MPa (internal pressure) for 280,000 hours. The aged material was submitted to rupture creep tests at 500 and 550°C and different stresses in order to built life extrapolation curves and analyze microstructural degradation and carbides precipitation. It was concluded that: the Larson-Miller is the parametric method that better fit aged and new steel degradation behavior in the life prediction obtained from the data of the aged steel, tending to predict the new one; the presence of M6C carbides is an indicator of Cr-Mo steel degradations. |
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