Cyclic plastic response of nickel-based superalloy at room and at elevated temperatures

0450280 - ÚFM 2016 RIV DE eng J - Článek v odborném periodiku
Polák, Jaroslav - Petrenec, Martin - Chlupová, Alice - Tobiáš, Jiří - Petráš, Roman
Cyclic plastic response of nickel-based superalloy at room and at elevated temperatures.
Materials Testing. Roč. 57, č. 2 (2015), s. 119-125. ISSN 0025-5300. E-ISSN 2195-8572
Grant CEP: GA ČR(CZ) GA13-23652S; GA MŠMT(CZ) ED1.1.00/02.0068
Institucionální podpora: RVO:68081723
Klíčová slova: cyclic plasticity * elevated temperature * superalloys * hysteresis loop * statistical theory
Kód oboru RIV: JL - Únava materiálu a lomová mechanika
Impakt faktor: 0.266, rok: 2015

Nickel-based cast IN 738LC superalloy has been cycled at increasing strain amplitudes at room temperature and at 800 °C. Hysteresis loops were analyzed using general statistical theory of the hysteresis loop. Dislocation structure of specimens cycled at these two temperatures were studied. They reveal localization of the cyclic plastic strain in the thin dislocation rich bands. The analysis of the loop shapes yields effective stresses of the matrix and of the precipitates and the probability density function of the critical internal stresses at both temperatures. It allows finding the sources of the high cyclic stress.
Trvalý link: http://hdl.handle.net/11104/0251654