Initial Degradation Process of Heat-resistant Materials Based on the Change of Crystallinity of Grains and Grain Boundaries

Initial strengthened micro textures of heat-resistant materials have been found to disappear under operating conditions due to the increase of operating temperature and mechanical loading for improving the thermal efficiency of various power and chemical plantsClick here and insert your abstract text. The change of the micro textures was observed from the viewpoint of the change of the order of atom arrangement by using electron back-scatter diffraction analysis. The change of the order of atom arrangement was investigated by analyzing the change of the sharpness of the measured diffraction pattern obtained from the area irradiated by a focused electron beam. The degradation process of the quality of grains and grain boundaries was measured quantitatively in plural materials and the strain-induced anisotropic diffusion of component elements was the dominant factor of the degradation process.