Heat Treatment Optimization for Nickel-based Cast Superalloy

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dc.contributor.authorAncona Orozco, David
dc.contributor.departmentChalmers tekniska högskola / Institutionen för industri- och materialvetenskapsv
dc.contributor.examinerLiu, Fang
dc.contributor.supervisorLiu, Fang
dc.date.accessioned2021-09-14T07:53:16Z
dc.date.available2021-09-14T07:53:16Z
dc.date.issued2021sv
dc.date.submitted2020
dc.description.abstractNickel-based superalloys are broadly used in the aerospace industry for applications at elevated service temperatures. Haynes 282 is a recently developed, gamma-prime (γ ′ ) strengthened, nickel-based superalloy that can be manufactured in different ways, such as wrought methods, powder methods, and castings. An important difference between these methods is the lower mechanical performance found in the cast version of the alloy. A way to improve the mechanical properties of cast Haynes 282 is through a tailored heat treatment that considers the different properties of the material and the microstructural changes required. The objective of this thesis work was to define alternative heat treatments to improve the ductility and strength of cast Haynes 282. These proposals were based on different studies found in literature, simulations, and microstructural analysis performed at GKN Aerospace. The heat treatments were tested and compared with reference values from the standard heat treatment recommended by Haynes International, and with a standard heat treatment developed by GKN. The tensile tests were carried out at room and elevated temperature, and their results, in combination with the microstructural analysis of the secondary phases performed in the different heat treated samples, showed an improvement in mechanical properties from a couple of heat treatment proposals. A proposed heat treatment, labeled HT10, showed a potential improvement of tensile strength, ductility and containment properties at an elevated temperature of 750 °C. Haynes standard heat treatment also showed improved properties between the two temperatures, when compared to the standard GKN heat treatment.sv
dc.identifier.coursecodeIMSX30sv
dc.identifier.urihttps://hdl.handle.net/20.500.12380/304113
dc.language.isoengsv
dc.setspec.uppsokTechnology
dc.subjectNickel superalloysv
dc.subjectHaynes 282sv
dc.subjectheat treatmentsv
dc.subjectmechanical propertiessv
dc.subjectmicrostructuresv
dc.subjectductilitysv
dc.subjectcontainmentsv
dc.subjectcast materiasv
dc.subjectprecipitationsv
dc.subjectgamma primesv
dc.subjectcarbidessv
dc.titleHeat Treatment Optimization for Nickel-based Cast Superalloysv
dc.type.degreeExamensarbete för masterexamensv
dc.type.uppsokH
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