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Fatigue behavior is a discriminating feature in choice of steels for extreme conditions such as high or low temperatures and corrosive environments. This is the case of martensitic steels considered in this work, ASTM A182 grade F6NM, and VIRGO 39. These kind of steels are characterized by temperature changes of material related to fatigue damage very low. The fatigue behavior of these steels was investigated with two thermal methods based on temperature surface monitoring and phase variation of thermoelastic signal (TPA method). Two procedures were developed to process thermographic data and to assess fatigue limit of materials.

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