The Roles Of Microstructure And Mechanics In
Intergranular Stress Corrosion Cracking
Author(s)
A. P. Jivkov, N. P. C. Stevens & T. J. Marrow
Abstract
Previous work on the prediction of intergranular stress corrosion cracking
resistance in grain boundary engineered microstructures has used two
dimensional percolation models, in which the grain boundaries are assumed to be
either resistant or susceptible to cracking, depending on the grain boundary
character. One limitation of such models is that they do not necessarily account
for the mechanical crack driving force. Further, they cannot capture
experimentally observed phenomena such as the formation of isolated ductile
bridging ligaments by resistant boundaries. These arise due to the
three-dimensional character of crack propagation. A new mechanical crack
propagation model is presented which, via finite element solutions, addresses
these limitations. The model is based on a regular discrete representation of the
material’s microstructure and is applicable to both 2D and 3D behaviour. Results
are reported for 2D-hexagonal microstructures, and are compared with
percolation models. The results demonstrate the influence of stress on the crack
path, as well as the influence of the rupture strain of susceptible boundaries on
the crack behaviour. Further, the effect of crack bridging, which arises from
ductile resistant boundaries is studied.
Keywords: intergranular stress corrosion; microstructure; mechanics; crack
bridging; finite elements; Monte Carlo simulations.
1 Introduction
It has been increasingly realised during the last two decades, that the grain size is
not the only meso-scale factor influencing the strength of polycrystalline
materials. Two other factors have been brought to wider attention. The first is the
grain boundary character distribution (GBCD) which describes the fractions of
Keywords
intergranular stress corrosion; microstructure; mechanics; crack
bridging; finite elements; Monte Carlo simulations.
Related Book
Other papers in this volume
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