Institute of Physics of Materials AS CR, v. v. i. > Projects > Fatigue damage mechanisms in ultrafine grained stainless steels
Fatigue damage mechanisms in ultrafine grained stainless steels
Investigator | Ing. Jiří Man, Ph.D. |
Number of Project | 13-32665S |
Agency | Grantová agentura České republiky |
Duration | 2013-01-31 - 2016-01-30 |
Anotace |
Ultrafine grain austenitic stainless steel produced by transformation to martensite and reversion annealing represents an advanced material with number of possible applications. Its monotonic and fatigue properties are studied in order to characterize the material and to reveal basic damaging mechanisms contributing to the shortening of its fatigue life. Cyclic stress-strain response, internal structure of the material and its changes during cyclic loading, surface relief formation, fatigue crack initiation, short and long crack growth are studied in symmetric push-pull loading using computer controlled electrohydraulic testing system and advanced techniques as TEM, FEG-SEM, FIB, EBSD, AFM etc. The mechanisms of damage in individual stages of fatigue life are analyzed with the aim to assess the role of grain boundaries and compare the behaviour of ultrafine materials with their standard polycrystalline counterparts. The inflicted damage will be interpreted in terms of recent fatigue damage models. |