Effect of forging pressure on the microstructure of linear friction welded Inconel 738 superalloy

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dc.contributor.authorAmegadzie, Mark Yao
dc.contributor.examiningcommitteeRichards, Norman (Mechanical and Manufacturing Engineering) Shalaby, Ahmed (Civil Engineering)en_US
dc.contributor.supervisorChaturvedi, Mahesh (Mechanical and Manufacturing Engineering) Ojo, Olanrewaju (Mechanical and Manufacturing Engineering)en_US
dc.date.accessioned2012-07-27T17:24:01Z
dc.date.available2012-07-27T17:24:01Z
dc.date.issued2012-07-27
dc.degree.disciplineMechanical and Manufacturing Engineeringen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractInconel 738, which is a nickel base superalloy used for hot section components of aircraft and industrial turbines is difficult to fabricate and repair by fusion welding due to its susceptibility to heat affected zone (HAZ) intergranular cracking. Crack-free joining of the difficult-to-weld alloy is currently achieved by using linear friction welding (LFW). Nevertheless, oxidation along the joint during LFW is a major problem. Information about the effect of process parameters on the microstructural evolution of linear friction welded nickel base alloys is very limited. In this work, the effect of forging pressure on the microstructure of linear friction welded Inconel 738 was studied. The results as elucidated in this work showed that increased forging pressure caused strain-induced rapid solidification of metastable liquid, which resulted in complete elimination of deleterious liquid phase oxides in bonded material contrasting the generally accepted view that assumes extrusion of solid state oxides during LFW.en_US
dc.description.noteOctober 2012en_US
dc.identifier.urihttp://hdl.handle.net/1993/8125
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectFriction weldingen_US
dc.subjectForging pressureen_US
dc.subjectOxidationen_US
dc.subjectNickel superalloyen_US
dc.subjectRe-solidified eutecticsen_US
dc.subjectInconel 738en_US
dc.subjectRecrystallizationen_US
dc.subjectWeld temperatureen_US
dc.subjectVacancy diffusionen_US
dc.subjectPipe diffusionen_US
dc.titleEffect of forging pressure on the microstructure of linear friction welded Inconel 738 superalloyen_US
dc.typemaster thesisen_US
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