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.

晶体取向和晶界的表征对于理解材料暴露于侵蚀性介质引起的降解过程中发生的机制具有重要意义。在本研究中，先前通过电子背散射衍射分析的奥氏体不锈钢暴露于超声空化腐蚀。检查了几个参数，例如晶体取向、错误取向、重合位点晶格、Schmid 因子和孪晶取向，以确定它们对空化引起的早期损伤的局部敏感性的影响。发现晶体取向在晶粒内部发生的变形机制中起着重要作用。此外，相邻晶粒之间的高取向差被认为是导致在随机晶界观察到的早期损伤的决定性因素，而 Schmid 因子的差异被认为对孪晶界的抗空蚀性有显着影响。此外，还分析了相干孪晶预测的理想取向偏差的影响与空化阻力有关。