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The paper presents the results of research on low cycle fatigue life of GX12CrMoVNbN9 – 1 (GP91) cast steel at the temperature of 550°C. The cast steel under investigation was in the as-received condition (after heat treatment) and after 8000 hours of ageing at the temperature of 600°C. Cyclic loads were realized at five levels of total strain amplitude ɛac amounting to: 0.25; 0.30; 0.35; 0.50 and...
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