High Cycle Fatigue Damage Mechanisms of MAR-M 247 Superalloy at High Temperatures

0458479 - ÚFM 2017 RIV IN eng J - Článek v odborném periodiku
Šmíd, Miroslav - Horník, Vít - Hutař, Pavel - Hrbáček, K. - Kunz, Ludvík
High Cycle Fatigue Damage Mechanisms of MAR-M 247 Superalloy at High Temperatures.
Transactions of The Indian Institute of Metals. Roč. 69, č. 2 (2016), s. 393-397. ISSN 0972-2815. E-ISSN 0975-1645
Grant CEP: GA TA ČR(CZ) TA04011525; GA MŠMT(CZ) ED1.1.00/02.0068
Institucionální podpora: RVO:68081723
Klíčová slova: High cycle fatigue * S-N curves * Fractography * High temperature * EBSD analysis
Kód oboru RIV: JL - Únava materiálu a lomová mechanika
Impakt faktor: 0.533, rok: 2016

High cycle fatigue tests of the MAR-M 247 superalloy under constant load were conducted with the aim to determine S-N curves at temperatures 650, 800, 900 and 950 A degrees C. It has been found that the slope of the S-N curves reflects changes of the cyclic deformation mechanism with temperature. At temperatures 650 and partly at 800 A degrees C, fatigue crack propagation exhibits crystallographic character (propagation along the {111} system) in early stages of the fatigue life. The crystallographic mode of the fatigue crack propagation was found to disappear at temperatures 900 and 950 A degrees C.
Trvalý link: http://hdl.handle.net/11104/0258754