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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
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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Sborník semináře KŘEHKÝ LOM
 Dlouhý, Ivo ; Chlup, Zdeněk
Contribution presented on one-day workshop paid to problems of mechanisms and mechanics of brittle fracture. Quantitative description of toughness transition behaviour. Problems of constraint indexing parameter and J-integral calculation at elastic plastic behaviour of material. Fracture mikromechanisms and their modelling.
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Micromechanical aspects of constraint effect at brittle fracture initiation
 Chlup, Zdeněk ; Dlouhý, Ivo
Cast manganese steel predetermined for container casks of spent nuclear fuel has been tested extensively from the point of view of resistance against brittle fracture. For the fracture toughness evaluation the three-point bend specimens with different crack length (varying a/W ratio > 0,5; 0,2; 0,1) and with the same ligament below the crack tip have been used. Stress distributions below crack tip have been calculated by finite elements method (ABAQUS code) for each specimen geometry separately. Modification has been introduced into calculation taking into account specific material behaviour.
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