Please use this identifier to cite or link to this item:
|Title:||Impact of hydrogen on the high cycle fatigue behaviour of Inconel 718 in asymmetric push-pull mode at room temperature|
|Authors:||BRUCHHAUSEN MATTHIAS; FISCHER Burkhard; RUIZ MORENO ANA MARIA; GONZALEZ SANCHEZ SERGIO; HAEHNER Peter; SOLLER Sebastian|
|Citation:||INTERNATIONAL JOURNAL OF FATIGUE vol. 70 p. 137–145|
|Publisher:||ELSEVIER SCI LTD|
|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|
Files in This Item:
There are no files associated with this item.
Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.