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- Title
Interior crack initiation during the very‐high‐cycle fatigue of railway wheel steel under axial loading and rolling contact loading.
- Authors
Liu, Xiaolong; Gao, Pengcheng; Wu, Si; Zhang, Guanzhen; Cong, Tao
- Abstract
In this paper, a comparative study of the very‐high‐cycle fatigue (VHCF) behavior of railway wheel steel under axial loading and rolling contact loading was conducted. Fatigue tests were performed with an ultrasonic fatigue test machine under axial loading, and the fracture surfaces from the fatigue tests and shattered rims taken from the failed railway wheels were observed. The wheel steel under axial loading presents a VHCF behavior with Mode I crack, and that under rolling contact loading is a VHCF behavior with mix Mode II–III crack. For the VHCF behavior with Mode I crack, surface and interior crack initiation occurred with equal probability at both low and high stress levels and produced a dual linear S–N curve since the value of fatigue limits for the surface and interior crack initiation are close. For the VHCF behavior with mix Mode II–III crack, cracks were initiated from the interior Al2O3 inclusion, and the fatigue life was beyond 107 cycles. Fatigue bands were observed on the fracture surface under rolling contact loading. The ferrite nanograins formed due to the stress state of shear plastic strain with a large compressive stress. The formed nanograins were softer than the matrix caused by the redistribution of the carbon. Highlight: The VHCF under rolling contact loading is a failure mode of mix Mode II–III crack.The NG massively formed in the VHCF with mix Mode II–III crack.The shear plastic strain with a large compressive stress will help NG formation.
- Subjects
ROLLING contact; AXIAL loads; ROLLING contact fatigue; STEEL fatigue; FATIGUE limit; SHEAR strain; FATIGUE testing machines
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2022, Vol 45, Issue 7, p2127
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.13724