3D profiling of 12Cr heat resistante steel charpy V noch fracture surface obtained at different temperatures

Characterization of metal degradation after prolonged service is necessary for evaluating component exhaustion and its remaining service capability. Martensitic steel X20CrMoV 12.1 has been extensively used as a material for tubing systems and pipelines in thermal power plants. This paper compares data provided by two imaging techniques. Following tests were performed: impact testing at different temperatures and characterization of fracture surfaces of Charpy specimens by scanning electron microscope and 3D digital optical microscope. In this study three new geometrical characteristics were established, as a measure of the ductility change of material