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Embrittlement of EUROFER´97 steel due to thermal exposition
Hadraba, Hynek ; Dlouhý, Ivo
Ferritic-martensitic reduced activation steel Eurofer´97 is leading candidate for structural material for in-vessel and first wall components of proposed fusion reactor DEMO. The utilization of the Eurofer´97 steels is limited up to a temperature of about 550°C. The aim of the work is to investigate the influence of long term thermal ageing on fracture properties of Eurofer´97 steel. Short term thermal ageing of the steel was simulated by step cooling treatment. Long term thermal ageing was simulated by isothermal ageing at 550 °C/5000 h. No evident changes in Charpy impact energy have been registered when comparing the properties of the steel in as-received and in step-cooled state. Outstanding embrittlement of the steel was observed after long term isothermal ageing: transition temperatures shift by about 5 °C. Risk of grain boundary weakening by phosphorus segregation is very low while the carbide coarsening could led to outstanding embrittlement of the Eurofer´97 steel.

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