Institute of Physics of Materials AS CR, v. v. i. > Projects > Role of oxide dispersion in fatigue behaviour of ODS type steels

Role of oxide dispersion in fatigue behaviour of ODS type steels

Investigatorprof. Mgr. Tomáš Kruml, CSc.
Number of Project106/09/1954
AgencyGrantová agentura České republiky
Duration2008-12-31 - 2012-12-30

Anotace
The main topic of this project is to investigate the role of fine oxide dispersion as a strengthening element during cyclic plastic deformation of ODS steels which are under development in fusion program. It is known that ODS ferritic and ferritic/martensitic steels posses longer lifetime and higher resistance against cyclic degradation especially at elevated temperatures in comparison with alloys without oxide dispersion. Miniaturized specimens will serve for measuring of fatigue life curves, cyclic stress-strain curve etc. from room temperature up to 800°C, to define specific material behaviour. TEM analysis will be used for understanding of interaction dislocations-oxide dispersion and for investigation of the microstructure produced during cyclic loading. Influence of the small specimen size on fatigue crack growth rate will be studied experimentally on the sheet specimens with varying thickness and by mathematical modelling using the finite elements calculations. The final results of the project can help with more effective design of ODS steels for specific requirement as needed for the fusion program.


2013

Kuběna I., Kruml T.: Fatigue life and microstructure of ODS steels. Eng. Fract. Mech. 103 (2013) 39-47

Ševčík M., Hutař P., Náhlík L., Seitl S.: The effect of constraint level on a crack path. Engineering Failure Analysis. Eng. Fail. Anal. 29 (2013) 83-92



2012

Kuběna I., Fournier B., Kruml T.: Effect of microstructure on low cycle fatigue properties of ODS steels. J. Nucl. Mater. 424 (2012) 101-108

Ševčík M., Hutař P., Zouhar M., Náhlík L.: Numerical estimation of the fatigue crack front shape for a specimen with finite thickness. Int. J. Fatigue 39 (2012) 75-80

Polák J., Man J., Petrenec M.: Damage evolution during fatigue in structural materials. Procedia Mater. Sci. 1 (2012) 3-12



2011

Kruml T., Polák J.: Fatigue cracks in Eurofer 97 steel: Part I. Nucleation and small crack growth kinetics. J. Nucl. Mater. 412 (2011) 2-6

Kruml T., Hutař P., Náhlík L., Seitl S., Polák J.: Fatigue cracks in Eurofer 97 steel: Part II. Comparison of small and long fatigue crack growth. J. Nucl. Mater. 412 (2011) 7-12

Kruml T., Kuběna I., Polák J.: Fatigue behaviour and surface relief in ODS steels. Procedia Eng. 10 (2011) 1690-1695

Hutař P., Náhlík L., Ševčík M., Seitl S., Kruml T., Polák J.: Fatigue crack propagation rate in EUROFER 97 estimated using small specimens. Key Eng. Mater. 452-453 (2011) 325-328