Statistics on industrial GT indicate that blade failure represents 62% of the total damage costs for heavy duty GT. High cycle fatigue (HCF) occurs for 12% of compressor blades. Thus, several technical papers have been interested in the fatigue aspects of the GT blades. Kargarnejad and Djavanroodi have performed an assessment of a failed GT blade and noticed that the maximum stress due to centrifugal force and fluid pressure is located near the connection point of the airfoil and the root. Crack initiation and propagation in the base metal was due to mixed fatigue/creep mechanism and grain boundary brittleness caused by formation of a grain boundary continuous film of carbides. Qu et al.have investigated the fracture surface of a failed first stage blade in GT engine and found that during initial fracture stage, the crack propagates slowly and the fracture surface is generally quite flat. Accordingly, the fracture surface becomes gradually rougher