Work

Fatigue crack initiation site transition of high‐strength steel under very high‐cycle fatigue

Year: 2024

Type: article

Abstract: The very high‐cycle fatigue (VHCF) fractographies of high‐strength steel AISI 4340 with tensile strength ranging from 1285 to 2363 MPa fabricated by tempering were systematically observed and quantitatively analyzed. It is found that the fatigue crack initiation sites were gradually transferred from the specimen surface to the interior with increasing the tensile strength or decreasing the stress amplitude. Such phenomenon has become common rule in the high‐cycle fatigue (HCF) or VHCF regimes of high‐strength steels. Based on the fracture mechanics, a simplified transition mechanism for fatigue crack initiation sites is established in terms of the influence of applied stress amplitude and microstructure, which is beneficial to enhance our understanding on the variation of fatigue strength increasing the tensile strength.

Source: Fatigue & Fracture of Engineering Materials & Structures

DOI: 10.1111/ffe.14437

Authors: Xiaoyuan Teng, Jianchao Pang, Chong Gao, Shouxin Li, Zhefeng Zhang

Institutions: University of Science and Technology of China, Chinese Academy of Sciences, Institute of Metal Research, Shenyang National Laboratory for Materials Science

Language: English

Topic: Fatigue and fracture mechanics

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

Open Access status: bronze

Funders: National Natural Science Foundation of China, National Key Research and Development Program of China

Awards: G5722587510, G5999776184, G6422635216