In situ study of the stress relaxation during aging of nickel-base superalloy forgings

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dc.contributor.authorAba-Perea, PEen_AU
dc.contributor.authorWithers, PJen_AU
dc.contributor.authorPriling, Ten_AU
dc.contributor.authorParadowska, AMen_AU
dc.contributor.authorMa, Den_AU
dc.contributor.authorPreuss, Men_AU
dc.date.accessioned2021-02-12T06:12:38Zen_AU
dc.date.available2021-02-12T06:12:38Zen_AU
dc.date.issued2019-06-03en_AU
dc.date.statistics2021-02-11en_AU
dc.description.abstractNickel-base superalloys are conventionally aged in order to develop a favorable microstructure as well as to relieve residual stresses. Here neutron diffraction was used to follow the evolution of residual stress during aging in Inconel 718 and Udimet 720LI for the first time by a combination of in situ and ex situ measurements. First, the quench-induced stress profiles were determined for different geometries of Inconel 718 forgings confirming that the amplitude of stress is not significantly affected by the thickness of the component. It was followed by in situ residual stress analysis using neutron diffraction during aging/annealing treatments at 650 °C, 720 °C, and 750 °C. Almost 90 pct of stress relaxation was found to occur primarily during heating to the aging temperature as a result of a combination of plasticity and early-stage creep relaxation. Creep-like stress relaxation was observed to evolve at a diminishing rate during the isothermal treatment of Inconel 718 at 720 °C and 750 °C, while no further stress relaxation occurred at 650 °C. This means that a change in hold temperature might have a more immediate impact on stress relaxation than a change in duration of heat treatment. The post-aging ex situ measurements showed that a heat treatment at 750 °C for 8 hours reduced the stresses by approximately 70 pct in Inconel 718. By comparison, when heat treating Udimet 720LI in the same way only a 20 pct stress reduction was observed, which is explained by the higher creep resistance of this alloy. © 2021 Springer Nature Switzerland AGen_AU
dc.identifier.citationAba-Perea, P. E., Withers, P. J., Pirling, T. Paradowska, A., Ma, D., & Preuss, M. (2019). In situ study of the stress relaxation during aging of nickel-base superalloy forgings. Metallurgical and Materials Transactions A, 50, 3555–3565. doi:10.1007/s11661-019-05302-0en_AU
dc.identifier.issn1543-1940en_AU
dc.identifier.journaltitleMetallurgical and Materials Transactions Aen_AU
dc.identifier.pagination3555-3565en_AU
dc.identifier.urihttps://doi.org/10.1007/s11661-019-05302-0en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10399en_AU
dc.identifier.volume50en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectNickel alloysen_AU
dc.subjectMicrostructureen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectResidual stressesen_AU
dc.subjectAnnealingen_AU
dc.subjectAgingen_AU
dc.subjectIsothermal processesen_AU
dc.subjectHeatingen_AU
dc.titleIn situ study of the stress relaxation during aging of nickel-base superalloy forgingsen_AU
dc.typeJournal Articleen_AU
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