liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
A New Single Crystal Superalloy for Power Generation Applications:  
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
University of Birmingham.
Siemens Industrial Turbomachinery AB.
Siemens Industrial Turbomachinery AB.
Show others and affiliations
2011 (English)In: Proceeding of the 8th International Charles Parsons TurbineConference 2011, 2011, G2-2- p.Conference paper, Published paper (Refereed)
Abstract [en]

A newly developed single crystal superalloy (known as STAL15) is described which is suitable for use in first stage blades of highly efficient industrial gas turbines (IGTs). With 15 wt% Cr and 4.55 wt% Al, the alloy combines good corrosion and oxidation resistance with sufficient creep and fatigue performance. Thus a novel and useful balance of environmental and mechanical properties is displayed. In this paper, the details of the development project are described. The new alloy is shown to be an alumina (Al2O3) former; the mechanisms behind the Al2O3-formation process are studied and the effects arising from changes in the chemical composition have been modelled. In addition, the mechanical properties in terms of creep and fatigue resistance are evaluated together with the alloy stability during long term (up to 10,000 hours) exposure. For such applications, the new alloy is superior to existing nickel-based single crystal superalloys designed for aero engine applications and which are optimized for very high creep resistance; experience has shown that they are not ideal for use in IGTs of the type used for power generation or mechanical drive, due to their low corrosion resistance. The main reason for this is that IGTs are exposed to more harsh conditions in terms of air quality through the turbine and significantly longer time between overhaul/inspection. Traditionally this has been handled by use of polycrystalline alloys such as IN792 and IN738LC or the single crystal alloy PWA1484; unfortunately these do not form a protective Al2O3 layer and hence display limited resistance to environmental degradation. The new alloy does not display this weakness and is therefore highly optimised for IGT applications.

Place, publisher, year, edition, pages
2011. G2-2- p.
Keyword [en]
Alloy development, single crystal superalloy, STAL15, oxidation, corrosion, creep deformation, thermomechanical fatigue, Si-additions
National Category
Applied Mechanics Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-72160OAI: oai:DiVA.org:liu-72160DiVA: diva2:457681
Conference
8th International Charles Parsons TurbineConference, Portsmouth, UK, 2011
Available from: 2011-11-18 Created: 2011-11-18 Last updated: 2011-11-29

Open Access in DiVA

No full text

Authority records BETA

Moverare, Johan

Search in DiVA

By author/editor
Moverare, Johan
By organisation
Engineering MaterialsThe Institute of Technology
Applied MechanicsMetallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 309 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf