Title: Impact of hydrogen on the high cycle fatigue behaviour of Inconel 718 in asymmetric push-pull mode at room temperature
Authors: BRUCHHAUSEN MATTHIASFISCHER BurkhardRUIZ MORENO ANA MARIAGONZALEZ SANCHEZ SERGIOHAEHNER PeterSOLLER Sebastian
Citation: INTERNATIONAL JOURNAL OF FATIGUE vol. 70 p. 137–145
Publisher: ELSEVIER SCI LTD
Publication Year: 2015
JRC N°: JRC90314
ISSN: 0142-1123
URI: http://www.sciencedirect.com/science/article/pii/S0142112314002333#
http://publications.jrc.ec.europa.eu/repository/handle/JRC90314
DOI: 10.1016/j.ijfatigue.2014.09.005
Type: Articles in periodicals and books
Abstract: The influence of hydrogen on the high cycle fatigue (HCF) behaviour of Inconel 718 has been studied at room temperature in asymmetric push-pull mode using an ultrasonic HCF test rig. Fatigue tests have been carried out in gaseous hydrogen (GH2) and in Ar at a pressure of 30 MPa. Oscillating stresses with amplitudes (S_a) up to 450 MPa and mean stresses (S_m) up to 600 MPa have been applied. For a given S_a and S_m, the lifetime in Ar is generally longer than in GH2, which is explained by a hydrogen-induced embrittlement of the material. For a constant S_a of 218 MPa, the lifetime in Ar and in GH2 is very similar for high S_m, but the difference in lifetime increases as the mean stress decreases. An approach is presented to describe the number of cycles to failure N_f as a function of S_a and S_m. Microstructural analysis has been performed on the specimens tested at S_a = 218 MPa and two values of S_m (300 MPa and 600 MPa). SEM analyses of the fracture surfaces of these samples indicate embrittlement of the material when tested in hydrogen atmosphere.
JRC Directorate:Energy, Transport and Climate

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