Physics – Condensed Matter – Materials Science
Scientific paper
2010-09-14
J. Nucl. Mater. 416, 55 (2011)
Physics
Condensed Matter
Materials Science
8 pages, 5 figures
Scientific paper
10.1016/j.jnucmat.2010.11.051
In Ni-base superalloys with low Al and/or Ti content the precipitation and subsequent coarsening of gamma' particles at intermediate temperatures contribute to the degradation of the mechanical properties of the alloy. In the present paper the coarsening process is modelled and the change of the critical resolved shear stress of the alloy due to coarsening of the gamma' particles is calculated by means of statistical analysis of the depinning of a single gliding edge dislocation. It is found that the contribution of gamma' hardening to the critical resolved shear stress at 973 K reduces to more than half of its original value in less than one year.
Bakó Botond
Hoffelner Wolfgang
Ispánovity Péter Dusán
Samaras Maria
Weygand Daniel
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