The role of crystal orientation and grain boundaries in the cavitation resistance of EN 1.4301 austenitic stainless steel: An EBSD study

Characterization of crystal orientation and grain boundaries is of great interest in the understanding of the mechanisms taking place during the degradation process originated by the exposure of materials to erosive media. In the present study, an austenitic stainless steel previously analyzed by el...

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Bibliographic Details
Published in:Wear 2021-12, Vol.486-487, p.204040, Article 204040
Main Authors: Stella, Jorge, Pohl, Michael
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Cavitation
Cavitation erosion
Cavitation resistance
Crystal lattices
Crystal structure
Crystallography
CSL
Damage
Deformation mechanisms
EBSD
Electron backscatter diffraction
Grain boundaries
Misalignment
Misorientation
Orientation
Schmid factor
Stainless steel
Twin boundaries
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Summary:Characterization of crystal orientation and grain boundaries is of great interest in the understanding of the mechanisms taking place during the degradation process originated by the exposure of materials to erosive media. In the present study, an austenitic stainless steel previously analyzed by electron backscatter diffraction was exposed to ultrasonic cavitation erosion. Several parameters such as crystal orientation, misorientation, coincidence site lattice, Schmid factor and twin orientation were examined in order to determine their influence on the local susceptibility to early damage induced by cavitation. Crystallographic orientation was found to play a significant role in the deformation mechanisms occurring inside grains. Furthermore, high misorientation between adjacent grains was recognized as a determining factor leading to early damage observed at random grain boundaries, while the difference in Schmid factor was identified to have a significant effect on the cavitation resistance of twin boundaries. Moreover, the effect of the deviation from the ideal orientation predicted for coherent twins was analyzed in connection with cavitation resistance. •Ultrasonic cavitation erosion of austenitic steel EN 1.4301 was studied•Crystallographic orientation and grain boundaries were characterized by EBSD•Formation of slip bands inside grains is highly affected by crystal orientation•Schmid factor difference was found to be determinant in twin boundary damage•Twin boundaries having relatively low degree of coherence exhibit poor resistance
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2021.204040