Dynamic recovery observed in distinct grains within a polycrystalline nickel-based superalloy during cyclic high temperature fatigue via high energy X-ray diffraction microscopy

SCRIPTA MATERIALIA

卷:192

Article

Gustafson, Sven E.¹  Pagan, Darren C.²  Shade, Paul A.³  Sangid, Michael D.¹ 

[1] Purdue Univ, Sch Aeronaut & Astronaut, 701 W Stadium Ave, W Lafayette, IN 47906 USA

[2] Cornell High Energy Synchrotron Source, Ithaca, NY USA

[3] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

关键词: Thermomechanical fatigue;    Microstructure;    X-ray diffraction;    Recovery;    Synchrotron radiation;   

DOI  :  10.1016/j.scriptamat.2020.10.004

来源: Elsevier

【 摘 要 】

Elastic micromechanical fields are tracked for a nickel-based superalloy polycrystal via high energy X-ray diffraction microscopy (HEDM) and corresponding intragranular deformation metrics are determined with peak broadening analysis during cyclic high temperature loading. A low solvus, high refractory (LSHR) sample with 252 grains was subjected to uniaxial tension and held under fixed displacement while thermally cycling between 460 degrees C and 770 degrees C with intermittent HEDM characterization to study the grain average response to thermo-mechanical deformation. Elevated temperatures were found to allow for heterogeneous amounts of recovery amongst distinct grains within the sampled region, indicating complex grain interactions; the extent of recovery was greater at higher temperatures. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free