Metallurgical and Materials Transactions A

, Volume 48, Issue 5, pp 2363–2374 | Cite as

Continuous Measurements of Recrystallization and Grain Growth in Cobalt Super Alloys

  • Mahsa Keyvani
  • Thomas Garcin
  • Damien Fabrègue
  • Matthias Militzer
  • Kenta Yamanaka
  • Akihiko Chiba
Article
  • 213 Downloads

Abstract

L605 (20Cr-15W-10Ni wt pct) and CCM (28Cr-6Mo wt pct) cobalt-based superalloys are candidates for a wide range of applications, from gas turbine components to biomedical implants. Attention is currently focused on the optimization of grain structure as an appropriate approach to increase yield stress without affecting significantly the ductility. In this study, the Laser Ultrasonics for Metallurgy (LUMet) technology is used to examine in situ the evolution of the mean grain size associated with recrystallization and grain growth during heat treatments from the cold-rolled state. The recrystallization process is completed at 1373 K (1100 °C) for L605 and 1273 K (1000 °C) for CCM. The subsequent grain growth rate in L605 is larger compared to CCM. Continuous measurements of the grain size evolution are found to be consistent with grain growth affected by solute drag. Through in situ measurements, the laser ultrasonic technology significantly accelerates the determination of metallurgical parameters allowing for fast optimization of process parameters required to meet specific applications.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2017

Authors and Affiliations

  • Mahsa Keyvani
    • 1
  • Thomas Garcin
    • 1
  • Damien Fabrègue
    • 2
    • 3
  • Matthias Militzer
    • 1
  • Kenta Yamanaka
    • 4
  • Akihiko Chiba
    • 4
  1. 1.The Centre for Metallurgical Process EngineeringThe University of British ColumbiaVancouverCanada
  2. 2.Université de Lyon, CNRSVilleurbanneFrance
  3. 3.INSA-Lyon, MATEIS UMR5510VilleurbanneFrance
  4. 4.Institute for Materials ResearchTohoku UniversitySendaiJapan

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