Abstract
When metallic components operate in aggressive environments their service life is, in general, determined by the presence of a protective surface film which acts as a barrier to the reactants. Large residual stresses can result from the volume changes due to oxidation, the so-called growth stresses. These stresses may lead to film cracking or spalling or both. A visco-elastic model for the calculation of growth stresses in oxidizing tubes has been developed. It can deal with uniaxial and multi-axial oxidation strain tensors. Different oxidation modes like surface and interface oxidation as well as duplex scale formation are treated. It appears that even relatively small lateral oxidation-strain components could have a considerable effect on the stress level in the tube. A simplified version of the model has been applied to simulate the geometrical changes of Zry tube sections exposed to air having reached the break-away regime. We think that lateral oxidation strains were mainly responsible for the observed diameter increase.
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Abbreviations
- E :
-
Young’s modulus
- \(\varvec{\Phi}\) :
-
Pilling–Bedworth ratio
- ν:
-
Poisson ratio
- e :
-
oxidation strain
- ɛ:
-
total strain
- σ:
-
stress
- δ:
-
scale thickness
- cr :
-
creep
- h :
-
thickness
- r :
-
radius
- u :
-
displacement
- av:
-
average
- cl:
-
cladding
- d:
-
displaced
- el:
-
elastic
- eq:
-
equivalent
- f:
-
oxide film
- i:
-
inner
- inel:
-
inelastic
- int:
-
interface
- intr:
-
intrinsic
- lat:
-
lateral
- me:
-
metal
- o:
-
outer
- ox:
-
oxide
- par:
-
parabolic
- r:
-
radial
- s:
-
metallic substrate
- tot:
-
total
- z:
-
axial
- Θ:
-
azimuthal
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Steiner, H., Konys, J. & Heck, M. Growth Stresses in Oxidized Tubes Under Uni- and Multi-Axial Oxidation Strain. Oxid Met 66, 37–67 (2006). https://doi.org/10.1007/s11085-006-9013-2
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DOI: https://doi.org/10.1007/s11085-006-9013-2