Investigator: doc. RNDr. Karel Obrtlík, CSc.
Number of Project: 106/07/1507
Agency: Czech Science Foundation
Duration: 01. 01. 2007 - 31. 12. 2009

The project is directed to the study of fatigue-creep interaction – the synergism of two most important degradation processes in material of machine part under service at high temperature. The main scope of the project is deeper understanding of creep strain influence on substantial parameters and stages of low cycle fatigue in advanced Ni-based superalloys (IN713LC, IN738LC and IN792-5A). Main attention will be paid to the effect of dwell periods on fatigue life, stress-strain response, strain localization and crack initiation. Detailed structure analysis will be applied to study the damage evolution of the superalloys. Solution of the project will result in deeper clarification of fatigue-creep synergism.

JULIŠ M, OBRTLÍK K, POSPÍŠILOVÁ S, PODRÁBSKÝ T: Surface relief evolution in cast superalloy INCONEL 738LC fatigued at room temperature. Acta Metall. Slovaca 13 (2007) 573–577.

OBRTLÍK K, CHLUPOVÁ A, PETRENEC M, POLÁK J: Low cycle fatigue of cast superalloy Inconel 738LC at high temperature. Key Eng. Mater. 385–387 (2008) 581–584.