Effect of cyclic loading on microstructure and plastic deformation in heat-treated Co–28Cr–6Mo alloy fabricated via laser powder bed fusion: An in situ synchrotron X-ray diffraction study:Materials Science and Engineering: A

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Erscheinungsjahr:
2025
Medientyp:
Text
Schlagworte:
  • Co-Cr-Mo alloy
  • Crystallographic variant selection
  • Deformation-induced martensitic transformation
  • Laser powder bed fusion
  • Reverse phase transformation
  • After-heat treatment
  • Chromium alloys
  • Cobalt metallography
  • Cobalt powder metallurgy
  • High resolution transmission electron microscopy
  • Low-cycle fatigue
  • Molybdenum alloys
  • X ray powder diffraction
  • CoCrMo alloy
  • In-situ synchrotrons
  • Laser powders
  • Martensitics
  • Microstructural changes
  • Powder bed
  • Cobalt alloys
Beschreibung:
  • We present a systematic microstructure-oriented plasticity investigation of an additively manufactured cobalt-based alloy aiming to relate microstructural changes to the fatigue resistance. A load-controlled cyclic test in the low-cycle fatigue regime was utilized to study mechanical response and microstructural changes in the alloy after reverse phase transformation heat treatment. Deformation-induced FCC → HCP phase transformation was followed using in situ synchrotron X-ray diffraction combined with ex situ electron backscatter diffraction and scanning electron microscopy. Scanning transmission electron microscopy provided experimental evidence of the presence of precipitates in the solution annealed sample. It was found, that a stepwise increase in plastic deformation is attributed to nucleation and growth of different martensitic crystallographic variants. These insights into plasticity and microstructural changes suggest that the reverse phase transformation heat treatment is an effective approach for improving the fatigue resistance of low stacking fault energy alloys, that are susceptible to deformation-induced martensitic transformation. © 2024 Elsevier B.V.
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  • info:eu-repo/semantics/closedAccess
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Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/095cf894-f532-485b-afcc-3f63c9ee1653