TY - JOUR AU - Hedayatnejad, R AU - Farhadi, S TI - Evaluation of the Application of Non-Destructive Tests in Investigating the Defects of Gas Turbine Blades and Using Thermography Method as an Alternative Method JO - Journal of Environmental Friendly Materials VL - 5 IS - 2 SP - 55 EP - 64 PY - 2021 DO - ER -