RT Journal Article
SR Electronic
A1 Belan, Juraj
A1 Jambor, Michal
A1 Kuchariková, Lenka
A1 Tillová, Eva
A1 Chalupová, Mária
A1 Matvija, Miloš
T1 The SEM Investigation of Inconel 718 Fatigue Process at Various Loading Conditions
JF Manufacturing Technology Journal
YR 2017
VO 17
IS 5
SP 658
OP 665
DO 10.21062/ujep/x.2017/a/1213-2489/MT/17/5/658
UL https://journalmt.com/artkey/mft-201705-0003.php
AB Fracture surfaces of specimens broken by cyclic loading provide valuable information about individual stages of fatigue process. Changes in the loading conditions (character of fatigue loading, stress amplitude level, influence of cycle asymmetry ratio R, testing temperature, environment of test, etc.) and in the structure of tested material as well cause changes in the fatigue process, whose have effect on fracture surface resulting in change of fatigue properties. In this paper, authors describe the changes of fatigue process of nickel base superalloy Inconel 718 as a result of loading conditions change using SEM (Scanning Electron Microscopy) microfractography analysis of fractured surfaces. The various fatigue loading were, at the first, regular push-pull loading with asymmetry ratio R = -1 and frequency f = approx. 20 000 kHz (High Frequency and High Cycles fatigue Loading - HFL) and the second was three-point flexure loading with asymmetry ratio R = 0.116 / 0.507 and frequency f = approx. 150 Hz (Low Frequency and High Cycles fatigue Loading - LFL). All fatigue tests were done at room temperature.