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Deformation and damage mechanisms during thermal-mechanical fatigue of a single-crystal superalloy
Linköping University, Department of Management and Engineering, Engineering Materials . Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Engineering Materials . Linköping University, The Institute of Technology.
University of Birmingham.
2009 (English)In: ACTA MATERIALIA, ISSN 1359-6454 , Vol. 57, no 7, 2266-2276 p.Article in journal (Refereed) Published
Abstract [en]

The deformation and damage mechanisms arising during thermal mechanical fatigue (TMF) of the single-crystal superalloy CMSX-4 have been investigated, both in the virgin condition and after long-term exposure at 1000 degrees C. Fundamental differences in the mechanical response due to ageing have been discovered, which are attributed to the tendency for the precipitation of topologically close-packed phases during deformation. In the virgin condition, the deformation during TMF is very localized and concentrated to twin bands which extend over the complete cross-section of the specimen; at the interception of these bands, the material is prone to recrystallization. The aged material on the other hand shows a much more dispersed deformation behaviour in which the length and thickness of the twins are much smaller and no recrystallization is found. Instead, significant local misorientations-implying crystal rotation are observed in the aged material after rupture.

Place, publisher, year, edition, pages
2009. Vol. 57, no 7, 2266-2276 p.
Keyword [en]
Thermal mechanical fatigue, Deformation mechanisms, Twinning, Recrystallization, Single crystal superalloy
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-18160DOI: 10.1016/j.actamat.2009.01.027OAI: oai:DiVA.org:liu-18160DiVA: diva2:216497
Available from: 2009-05-09 Created: 2009-05-08 Last updated: 2009-05-09

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Moverare, JohanJohansson, Sten

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  • apa
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  • vancouver
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  • Other style
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf