Fiber laser welding of nickel-based superalloy Inconel 718

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dc.contributor.authorOshobe, Omudhohwo Emaruke
dc.contributor.examiningcommitteeDeng, Chuang (Mechanical and Manufacturing Engineering) Bassuoni, Mohamed (Civil Engineering)en_US
dc.contributor.supervisorOjo, Olanrewaju (Mechanical and Manufacturing Engineering)en_US
dc.date.accessioned2012-08-20T21:41:35Z
dc.date.available2012-08-20T21:41:35Z
dc.date.issued2012-08-20
dc.degree.disciplineMechanical and Manufacturing Engineeringen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractInconel 718 (IN 718) is widely used in applications, such as aircraft and power turbine components. Recently, fiber laser welding has become an attractive joining technique in industry for fabrication and repair of service-damaged components. However, a major limitation in the laser welding of IN 718 is that liquation cracking occurs. In the present work, autogenous fiber laser welding of IN 718 was used to study the effects of welding parameters and different pre-weld heat treatments on liquation cracking. Contrary to previous studies, a dual effect of heat input on cracking is observed. A rarely reported effect of heat input is attributed to process instability. Liquation cracking increases with pre-weld heat treatment temperatures that increase grain size and/or, possibly, intregranular boron segregation. The study shows that pre-weld heat treatment at 950oC can be used for repair welding of IN 718 without significant loss in cracking resistance.en_US
dc.description.noteOctober 2012en_US
dc.identifier.urihttp://hdl.handle.net/1993/8444
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectFiber laser weldingen_US
dc.subjectliquation crackingen_US
dc.subjectInconel 718en_US
dc.subjectintergranular segregationen_US
dc.subjectnickel superalloyen_US
dc.subjectwelding parametersen_US
dc.subjectprocess instabilityen_US
dc.subjectheat treatmenten_US
dc.subjectrepair weldingen_US
dc.subjectgrain sizeen_US
dc.titleFiber laser welding of nickel-based superalloy Inconel 718en_US
dc.typemaster thesisen_US
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