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Grain boundary serration tuning and its effect on hot workability of a wrought superalloy

hal.structure.identifierPhD. Program in Prospective Functional Materials Industry,
hal.structure.identifierHigh Entropy Materials Center
dc.contributor.authorCHEN, Tso-Wei
hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorWANG, Pei-Te
hal.structure.identifierGloria Material Technology Corporation
dc.contributor.authorKANG, Yung-Chang
hal.structure.identifierS-Tech Corporation
dc.contributor.authorWU, Bo-Cheng
hal.structure.identifierDepartment of Materials Science and Engineering
dc.contributor.authorTSOU, Nien-Ti
hal.structure.identifierMetals and Alloys
dc.contributor.authorGLATZEL, Uwe
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGORSSE, Stéphane
hal.structure.identifierDepartment of Materials Science and Engineering
hal.structure.identifierHigh Entropy Materials Center
hal.structure.identifierPhD. Program in Prospective Functional Materials Industry,
dc.contributor.authorYEH, An-Chou
dc.date.issued2023
dc.identifier.issn0925-8388
dc.description.abstractEnThis study aims to elucidate the underlying mechanism of grain boundary serration and investigate its effects on hot workability of U720Li superalloy. Industrial scale as-cast ingots were subjected to heat treatments at 1180 °C followed by different cooling rates (15 °C/s, 0.1 °C/s, 0.02 °C/s and 0.003 °C/s) prior hot deformation. With 15 °C/s fast cooling, samples possessed straight boundaries and fine L12 structured γ’ particles dispersion. When the cooling rate was decreased to 0.1 °C/s and below, continuous and discontinuous precipitation of the γ' phase led to the formations of Type-I and Type-II grain boundary serrations, respectively. Lamellar γ/γ’ behind the mobile grain boundary was observed for Type-II boundary, which exhibited larger degree of undulation than that of Type-I boundary. With increasing fractions of Type-II boundary, the hot formability of U720Li was significantly improved during compression tests at 1000 °C; 70 % reduction ratio (true strain=1.2) could be achieved without crack formation. This work presents a simple process route to improve the hot deformability of U720Li fabricated on an industrial scale.
dc.language.isoen
dc.publisherElsevier
dc.title.enGrain boundary serration tuning and its effect on hot workability of a wrought superalloy
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jallcom.2023.170620
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Alloys and Compounds
bordeaux.page170620
bordeaux.volume960
bordeaux.peerReviewedoui
hal.identifierhal-04112884
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04112884v1
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