Vis enkel innførsel

dc.contributor.advisorJensrud, Ola
dc.contributor.advisorRoven, Hans Jørgen
dc.contributor.advisorLunder, Otto
dc.contributor.authorChristiansen, Kyrre Stefansson
dc.date.accessioned2019-02-19T15:01:22Z
dc.date.available2019-02-19T15:01:22Z
dc.date.created2018-07-10
dc.date.issued2018
dc.identifierntnudaim:20120
dc.identifier.urihttp://hdl.handle.net/11250/2586365
dc.description.abstractThe corrosion fatigue properties of a 7046 alloy were investigated and compared to previously reported work by SINTEF on the same alloy tested in air. To establish the corrosion fatigue properties, samples were either fatigue tested in a 5 wt% NaCl solution or pre-corroded in the same solution and subsequently tested in laboratory air. For the fatigue testing in 5 wt% NaCl solution, both T6 and T7 tempered samples were considered. To better understand how the corrosive environment influences the samples, SEM was used. The simultaneous effect of corrosion and fatigue was found to have a detrimental effect on fatigue life for this alloy, with a clearly reduced lifetime at all tested stress amplitudes. Additional heat treatment to T7 condition did not yield any lifetime differences compared to T6, suggesting a similar crack initiation mechanism for both temper states. For pre-corroded samples, lifetime differences were only found at longer exposure times (1 week and more). For the samples tested in 5 wt% NaCl, an initiation mechanism caused by oxide film rupture is proposed. For the samples pre-corroded for longer times (1 week and more), corrosion pits are thought to be the site for crack initiation.
dc.languageeng
dc.publisherNTNU
dc.subjectMaterialteknologi (MTMT), Materialutvikling og -bruk
dc.titleCorrosion fatigue of an extruded 7046 alloy
dc.typeMaster thesis


Tilhørende fil(er)

Thumbnail
Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel