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Quantitative precipitate classification and grain boundary property control in Co/Ni-base superalloys

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  • معلومة اضافية
    • Contributors:
      Royal Academy Of Engineering; Shell Global Solutions International BV
    • بيانات النشر:
      SPRINGER
    • الموضوع:
      2021
    • Collection:
      Imperial College London: Spiral
    • نبذة مختصرة :
      A correlative approach is employed to simultaneously assess structure and chemistry of (carbide and boride) precipitates in a set of novel Co/Ni-base superalloys. Structure is derived from electron backscatter diffraction (EBSD) with pattern template matching, and chemistry obtained with energy dispersive X-ray spectroscopy (EDS). It is found that the principal carbide in these alloys is Mo and W rich with the M6C structure. An M2B boride also exhibiting Mo and W segregation is observed at B levels above approximately 0.085 at. pct. These phases are challenging to distinguish in an SEM with chemical information (EDS or backscatter Z-contrast) alone, without the structural information provided by EBSD. Only correlative chemical and structural fingerprinting is necessary and sufficient to fully define a phase. The identified phases are dissimilar to those predicted using ThermoCalc. We additionally perform an assessment of the grain boundary serratability in these alloys, and observe that significant amplitude is only obtained in the absence of pinning intergranular precipitates.
    • ISSN:
      1073-5623
    • Relation:
      METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE; http://hdl.handle.net/10044/1/87754; RF/129; PO 4550133349
    • الرقم المعرف:
      10.1007/s11661-021-06156-1
    • الدخول الالكتروني :
      http://hdl.handle.net/10044/1/87754
      https://doi.org/10.1007/s11661-021-06156-1
    • Rights:
      © The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. ; http://creativecommons.org/licenses/by/4.0/
    • الرقم المعرف:
      edsbas.CB6213D7