Fatigue behaviour and surface relief in ODS steels

0368858 - ÚFM 2012 RIV NL eng J - Článek v odborném periodiku
Kruml, Tomáš - Kuběna, Ivo - Polák, Jaroslav
Fatigue behaviour and surface relief in ODS steels.
Procedia Engineering. Roč. 10, - (2011), s. 1685-1690. E-ISSN 1877-7058
Grant CEP: GA ČR GA106/09/1954
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: fatigue * life time * surface relief
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

Low cycle fatigue behaviour at room temperature of two 14Cr ferritic steels with ultrafine grains and strengthened by fine oxide dispersion is studied. The two steels differ mainly in the grain size distribution (uniform and bimodal). It is shown that the bimodal grain size distribution has a detrimental effect on the fatigue life time. The rough surface relief is formed in grains bigger than 1 micrometer in diameter. Nucleation and early growth of fatigue cracks is facilitated by the surface relief which leads to important reduction of the fatigue life
Trvalý link: http://hdl.handle.net/11104/0203084