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Influence of surface residual stresses on the fatigue life and crack propagation behavior of turned Inconel 718 super-alloy

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Javadi, Hamid, Jomaa, Walid, Dalgaard, Elvi, Brochu, Myriam et Bocher, Philippe. 2018. « Influence of surface residual stresses on the fatigue life and crack propagation behavior of turned Inconel 718 super-alloy ». In 12th International Fatigue Congress (FATIGUE 2018) (Poitiers, France, May 27-June 1, 2018) Coll. « MATEC Web of Conferences », vol. 165. EDP Sciences.
Compte des citations dans Scopus : 1.

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Abstract

The effects of surface roughness parameters and residual stresses induced by finish turning on fatigue life and crack propagation behavior of Inconel 718 super-alloy are investigated. A criterion serving as a good indicator of surface quality is also discovered. This is carried out for some specific turning conditions in order to control surface characteristics including surface roughness and the bi-axial state of surface residual stresses and to investigate the effects of these characteristics on fatigue behavior. Rotating bending fatigue (RBF) tests are performed on the machined specimens at room temperature. Characterization techniques including X-ray diffraction (XRD), laser confocal microscopy, and opto-digital microscopy are used to investigate surface residual stresses in axial (ARS) and hoop (HRS) directions, surface roughness, and secondary fatigue cracks, respectively. The huge dispersion in fatigue life of smooth turned Inconel 718 with very low arithmetic average roughness (Ra) values indicates that surface finishing is not the only reliable criterion for quality control of machined components. Multivariate statistical analyses show that axial surface residual stress is the most important surface characteristic affecting the fatigue life of machined Inconel 718 for the conditions tested. Changing ARS from compressive to tensile increases the number of secondary cracks and also decreases the fatigue life of turned specimens.

Item Type: Conference proceeding
Professor:
Professor
Bocher, Philippe
Affiliation: Génie mécanique
Date Deposited: 23 Jul 2018 17:36
Last Modified: 08 Apr 2019 15:26
URI: https://espace2.etsmtl.ca/id/eprint/16948

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