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MICROSTRUCTURE EVALUATION OF SERVICE AGED AND REJUVENATED NICKEL SUPER ALLOYS USING HOT ISOSTATIC PRESSING TREATMENT

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dc.contributor.authorBiyamin S.A.en_US
dc.contributor.authorBahari A.M.S.en_US
dc.contributor.authorPeng N.G.en_US
dc.contributor.authorSanmugham T.en_US
dc.contributor.authorGhazali R.en_US
dc.contributor.authorRamli R.en_US
dc.contributor.authorAzmin A.N.en_US
dc.contributor.authorid57204639647en_US
dc.contributor.authorid57411619300en_US
dc.contributor.authorid57220118009en_US
dc.contributor.authorid57204814476en_US
dc.contributor.authorid57667661200en_US
dc.contributor.authorid57213041822en_US
dc.contributor.authorid57220123847en_US
dc.date.accessioned2023-05-29T09:40:56Z
dc.date.available2023-05-29T09:40:56Z
dc.date.issued2022
dc.description.abstractThe design life of gas turbine blades is normally 48,000 equivalent operating hours (EOH) or 72,000 EOH based on the original equipment manufacturer (OEM) recommendation. Extending the service life of gas turbine blades is a huge advantage in the aspect of capital cost-saving in the power plant industries. The coarsening and shape transformation of ?? precipitates are one of the main life-limiting factors for gas turbine blades. Conventional heat treatment could not restore or recover ??-phase precipitates to their original morphology. In this study, hot isostatic pressing (HIP) treatment was used to improve the material properties of the blades to nearly zero-hour operation and prolong the life of gas turbine blades. HIP rejuvenation applies high temperature and pressure to close the micropores, retransform the microphases (i.e., ??-phase precipitates), and heal the material properties. For this case study, three HIP parameters were applied on nickel-based superalloy (GTD-111). Microstructure characterization was carried out on new, aged, and HIP-treated GTD-111 alloys using field emission scanning electron microscopy (FESEM). The microstructure after HIP treatment exhibited significant improvement and recovery in the morphology of ?? precipitates. The hardness of HIPed blade samples appeared consistent at 440 HV and did not deviate significantly from new materials with an average value of 439 HV. The average size of ?? precipitates was successfully reduced from 1.3 �m (degraded state) to 0.3 �m (near-zero state). The experimental results suggested that HIP treatment at 1,220 �C produced the best performance in microstructure transformation to the near-original state for the exposed blade of GTD-111 alloys as cast EQX. � 2022, Microscopy Society of Malaysia. All rights reserved.en_US
dc.description.natureFinalen_US
dc.identifier.epage255
dc.identifier.issue1
dc.identifier.scopus2-s2.0-85129501603
dc.identifier.spage245
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85129501603&partnerID=40&md5=96a8dbaf2290b31d0028c9decc26c3c6
dc.identifier.urihttps://irepository.uniten.edu.my/handle/123456789/27205
dc.identifier.volume18
dc.publisherMicroscopy Society of Malaysiaen_US
dc.sourceScopus
dc.sourcetitleMalaysian Journal of Microscopy
dc.titleMICROSTRUCTURE EVALUATION OF SERVICE AGED AND REJUVENATED NICKEL SUPER ALLOYS USING HOT ISOSTATIC PRESSING TREATMENTen_US
dc.typeArticleen_US
dspace.entity.typePublication
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