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Creep cavitation and microstructural degradation in Type 347H
Austenitic stainless steel Type 347H has been widely used in modern power and process industries for critical components at elevated temperatures subjected to stresses. Under such conditions, performance of the steel is restricted by creep. It has been shown that microstructural degradation and cavitation development are key factors to the loss of creep resistance in this steel. Therefore, study of microstructure and cavitation behaviour is essential to ensure safe operation and to extend economic lifetime of existing plants. Uni-axial creep tests at 600C at given stresses are running and the tests will be finished in a near future. Both interrupted and ruptured tests are conducted. After creep testing, specimens will be sectioned and metallographically prepared. Creep cavitation and carbide coarsening will be studied on those metallographically prepared samples.
Experiments: By using light optical and scanning electron microscopies as well as computerised image analysis system, the number and size of both cavities and carbides and their distribution will be quantitatively measured and analysed. In some cases, morphology and composition of particles will be studied.
Time table: You are expected within approximately five months to 1) carry out the above experiments, 2) perform the data analysis, 3) present the results on project meeting and 4) formulate a technical report.
Participating companies Alstom Power Sweden, AvestaPolarit, Birka Värme, Sandvik Steel and Vattenfall Utveckling
Informationen om uppsatsförslag är hämtad från Nationella Exjobb-poolen.