Study of Fatigue Crack Initiation in 316 Stainless Steel

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-02-03 DOI:10.1111/ffe.14592

O. Benabdeljalil, M. K. Khan, M. E. Fitzpatrick

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引用次数: 0

Abstract

Crack initiation in AISI 316 stainless steel has been investigated. Persistent slip bands (PSBs) were characterized using scanning electron microscopy (SEM) and atomic force microscopy (AFM). PSBs on the surface of the material increase the surface roughness and result in crack initiation. EBSD data from near the crack initiation region were used to correlate the global and local misorientations of the grains, plastic deformation, and Schmid factor with the fatigue life of specimens. The crack initiation region was found to have the highest misorientations. The region near crack initiation was found to have more plastic deformation, which was severe in specimens loaded with higher stresses. The kernel average misorientation (KAM) and grain reference orientation deviation (GROD) maps from the EBSD data were investigated for specimens that failed at different fatigue cycles. It was found that the interaction of high dislocation density, substructuring, and misorientation of low-angle grain boundaries in the region of plastic deformation resulted in fatigue crack initiation.

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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.