Abstract
The EBSD(Electron BackScatter Diffraction pattern) observations were conducted on unused and creep damaged materials of Mod.9Cr steel. GROD(Grain Reference Orientation Deviation) was used as the parameter to evaluate the grain inside distribution of deformation. The grain inside GROD distribution function was well approximated by the form of continuously distributed dislocation function. The coefficient A multiplied by grain size l was correlated with macroscopic creep strain and applied to evaluate strain distribution near creep void. Using A × l parameter, strains near creep voids were proved to be almost similar level of the macroscopic creep strains.
