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Thermomechanical Fatigue of Single-Crystal Superalloys: Influence of Composition and Microstructure
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Engineering Materials.
Dept of Metallurgy and Materials, University in Birmingham, UK.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
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2012 (English)In: Superalloys 2012: 12th International Symposium on Superalloys, The Minerals, Metals, and Materials Society, 2012, 369-377 p.Conference paper, Oral presentation only (Refereed)
Abstract [en]

The thermomechanical fatigue (TMF) behaviour of a new high Cr-containing single crystal superalloy, known as STAL-15, is investigated. This is a candidate alloy for future industrial gas turbine (IGT) applications. TMF involves complex interactions between high and low temperature deformation mechanism, and this study highlights important factors controlling their interrelationship. Emphasis is placed particularly on the microslructural aspects which control deformation. It is demonstrated that the TMF performance of the new alloy is comparable to that of a second generation alloy such as CMSX-4, despite the absence of Re alloying. An addition of 0.25wt% Si significantly improves the resistance to TMF further; this is attributed to a greater resistance to recrystallization and cracking along the deformation bands that develops across the cross section of the specimen during testing. The TMF resistance increases with increasing primary γ′ size, but the degree of solutioning of the γ′ phase caused by the solution heat treatment seems to have no significant effect.

Place, publisher, year, edition, pages
The Minerals, Metals, and Materials Society, 2012. 369-377 p.
Keyword [en]
thermomechanical fatigue, single cyrstal superalloy, STAL-15
National Category
Engineering and Technology Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-81531DOI: 10.1002/9781118516430.ch40ISBN: 9780470943205 (print)ISBN: 9781118516430 (print)OAI: oai:DiVA.org:liu-81531DiVA: diva2:553206
Conference
Superalloys 2012: 12th International Symposium on Superalloys, September 9-13 2012, Seven Springs, USA
Available from: 2012-09-18 Created: 2012-09-18 Last updated: 2014-11-11

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Moverare, JohanSegersäll, MikaelJohansson, Sten

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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  • Other style
More styles
Language
  • de-DE
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  • nn-NB
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Output format
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