Fractographic Studies of Destruction Nature of Plate Steel S420MLO After Fatigue Tests CTOD

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Abstract Macro- and fractographic studies of fractures of CTOD specimens after fatigue testing of essential steel rolled products with a thickness of 82 mm for fixed offshore structures of the S420MLO quality category, produced using the technology of thermomechanical processing with accelerated cooling, are presented. Fracture nature and the mechanisms of fatigue crack propagation at test temperatures of minus 10 and minus 30°C were studied. The potential reasons for the formation of a “secondary” fatigue crack propagation front and its potentially negative impact on the final test results are described. Research results and testing were used in passing, with a positive result of certification tests of rolled products of quality categories S355MLO and S420MLO with a thickness of up to 82 mm in accordance with the requirements of EN10225-1:2019 and NORSOK M-120.

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