Co-authors ČERNÝ Ivo & MIKULOVÁ Dagmar

The aim of this work was the interpretation of results of fatigue tests of low alloy 42SiCr steel. Three different types of heat treatment conditions were compared: (i) as received hot rolled material, (ii) classically heat treated material (quenched and tempered) and (iii) heat treated material using advanced quenching and partitioning (Q-P) process. The results of fatigue tests in combination with fractographical analysis showed significant differences concerning effects of inclusions on fatigue crack initiation evaluated as a dependence on the type of heat treatment of the samples. The influence of inclusions was evaluated by Murakami´s model (Murakami and Endo, 1994) [1]. This influence was compared with the difference of real fatigue life and expected fatigue life from Wöhler curve. [1] Murakami, Y., Endo, M.: Effects of defects, inclusions and inhomogeneities on fatigue strength. Int. J. Fatigue, 16, 1994, p. 163-182