超高循环疲劳下高强度钢的疲劳裂纹起始点转换

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2024-09-08 DOI:10.1111/ffe.14437

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

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引用次数: 0

摘要

系统地观察和定量分析了通过回火制造的抗拉强度在 1285 至 2363 兆帕之间的高强度钢 AISI 4340 的极高循环疲劳（VHCF）断口形貌。结果发现，随着抗拉强度的增加或应力振幅的减小，疲劳裂纹的起始点逐渐从试样表面向内部转移。这种现象已成为高强度钢的高循环疲劳（HCF）或 VHCF 状态下的普遍规律。在断裂力学的基础上，从外加应力振幅和微观结构的影响方面建立了疲劳裂纹起始点的简化过渡机制，这有利于加深我们对疲劳强度随抗拉强度增加而变化的理解。

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

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.

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.