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  4. Influence of mean stress and overaging on fatigue life of aluminum alloy EN AW-2618A
 
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2023
Journal Article
Title

Influence of mean stress and overaging on fatigue life of aluminum alloy EN AW-2618A

Abstract
Fatigue tests were performed on the forged aluminum alloy EN AW-2618A in the T61 state. Different stress ratios (R = -1, R = 0.1) were selected to study the influence of mean stress on fatigue life. Two overaged states (10 h/230 °C, 1000 h/230 °C) were also tested to investigate the influence of overaging on fatigue life. Transmission electron microscopy (TEM) was used to characterize the precipitates (S-phase), which are mainly responsible for the strength of the alloy. A fractographic analysis was also performed to determine the failure mode. Overaging reduces the fatigue life compared to the T61 state. The longer the aging time, the lower the fatigue resistance. The reason is the decrease in (yield) strength, which correlates with the radius of the S-phase: the precipitate radius increases by a factor of approximately two for the overaged states compared to the initial state. The analysis of the fracture surfaces showed crack initiation occurs predominantly on the outer surface and is associated with the primary phases.
Author(s)
Han, Ying
Bundesanstalt für Materialforschung und -prüfung -BAM-, Berlin  
Kruse, Juilius
Bundesanstalt für Materialforschung und -prüfung -BAM-, Berlin  
Rosalie, Julian M.
Bundesanstalt für Materialforschung und -prüfung -BAM-, Berlin  
Radners, Jan
Fraunhofer-Institut für Werkstoffmechanik IWM  
Hartrott, Philipp von
Fraunhofer-Institut für Werkstoffmechanik IWM  
Skrotzki, Birgit
Bundesanstalt für Materialforschung und -prüfung -BAM-, Berlin  
Journal
Materials Science and Engineering, A. Structural materials, properties, microstructure and processing  
Project(s)
Rechnerische Bewertung der Betriebsfestigkeit von Aluminium bei höchsten Anwendungstemperaturen unter Berücksichtigung anwendungsspezifischer Einflussgrößen
Funder
Bundesministerium für Wirtschaft und Klimaschutz -BMWK-
Open Access
DOI
10.1016/j.msea.2023.145660
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • aging

  • aluminum alloys

  • electron microscopy

  • fatigue

  • microstructure

  • s-phase

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