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  4. Cyclic deformation and lifetime of alloy 617B during thermo-mechanical fatigue
 
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2013
Journal Article
Title

Cyclic deformation and lifetime of alloy 617B during thermo-mechanical fatigue

Abstract
Different heats of the nickel-base Alloy 617B are tested under in-phase and out-of-phase thermo-mechanical fatigue (TMF) conditions at temperatures between 50 and 900°C. During one of the TMF tests the growth of microcracks is observed using the replica technique. After the tests, some of the specimens are inspected by scanning electron microscopy in order to analyse the prevailing damage mechanisms compared with those observed in isothermal low-cycle fatigue (LCF) tests. In addition, a Chaboche-type model and a fracture-mechanics-based lifetime model are employed to describe the cyclic viscoplastic deformation and fatigue lifetime. The Chaboche model adjusted to isothermal data is found to reasonably predict the cyclic viscoplastic behaviour of thermo-mechanically loaded specimens. Lifetime data of TMF tests fall into a common scatter band with LCF tests at temperatures above 400 °C if the test results are analysed based on the introduced lifetime model.
Author(s)
Maier, G.
Riedel, H.
Nieweg, B.
Somsen, C.
Eggeler, G.
Klöwer, J.
Mohrmann, R.
Journal
Materials at high temperatures  
DOI
10.3184/096034013X13636905345685
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • alloy 617

  • heat treatment

  • thermo-mechanical fatigue

  • cyclic deformation

  • fatigue life prediction

  • crack growth

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