Very high cycle fatigue of high carbon chromium bearing steel at high compressive mean stresses. (April 2023)

• Record Type: Journal Article
• Authors: Fitzka, Michael; Moalla, Mourad; Mayer, Herwig
• Is Part Of: International journal of fatigue. Volume 169(2023)
• Publication Date: 2023-04
• Subjects: Very high cycle fatigue -- Compression fatigue -- Bearing steel -- Fatigue limit -- Effective threshold stress intensity factor; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.107492
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Ultrasonic fatigue tests with σ min at the compressive yield stress are realized. High carbon chromium steel is tested at high compressive mean stresses and R = −1. Fatigue limits are found for high compressive mean stresses but not for R = −1. Damaging effect of inclusions can be quantified considering them as initial cracks. Kmax below effective threshold stress intensity means loading below the fatigue limit. Abstract: Very high cycle fatigue (VHCF) of high carbon chromium bearing steel 100Cr6 (SAE 52100; JIS SUJ2) is investigated with ultrasonic fatigue testing for compressive mean stresses with minimum stresses σ min at compressive yield stress σ CY, for σ min = 0.59 σ CY, and for load ratio R = −1. Fatigue limits are found for σ min = σ CY and for σ min = 0.59 σ CY, whereas no fatigue limit below 10 9 cycles exists at R = −1. Cracks leading to VHCF failures exclusively start at interior inclusions. Considering inclusions as cracks, the maximum stress intensity factor of a load cycle being below the effective threshold stress intensity factor determines the fatigue limit.