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Cyclic deformation and lifetime of alloy 617B during isothermal low cycle fatigue

 
: Maier, G.; Riedel, H.; Somsen, C.

:
Preprint urn:nbn:de:0011-n-2546185 (2.2 MByte PDF)
MD5 Fingerprint: a95c1ee279a021257557decc8d0cf11d
Created on: 5.12.2014


International journal of fatigue 55 (2013), pp.126-135
ISSN: 0142-1123
English
Journal Article, Electronic Publication
Fraunhofer IWM ()
alloy 617; precipitation; low cycle fatigue; cyclic deformation; fatigue life prediction

Abstract
Isothermal low cycle fatigue tests are carried out on the nickel-base Alloy 617B in the solution-annealed, stabilized and long-term aged conditions at temperatures between room temperature and 900 C. In addition, fatigue microcrack growth is measured using the replica technique. Transmission electron microscopy studies suggest that the observed differences in cyclic hardening between the different heat treatments result from the precipitation of fine carbides. Scanning electron microscope observations indicate a change in fracture mode for the solution-annealed and long-term aged material with temperature. The Chaboche model is able to describe the time and temperature dependent cyclic plasticity of the three material conditions. The measured lifetimes and crack growth rates can be described using a fracture mechanics based lifetime model. However, the data for room temperature and for temperatures above 400 C fall into two different scatter bands due to differences in crack growth rates.

: http://publica.fraunhofer.de/documents/N-254618.html