Texture effect on fatigue crack propagation in aluminium alloys: An overview

Abstract

Texture or grain orientation was of crucial importance to fatigue crack propagation (FCP) in aluminium alloys due to boundary character between neighbouring grains and crack closure effect. The current understanding of the relationship among texture, grain size, slipping and crack propagation at fatigue stage I to III was reviewed and discussed. The recommendations for improving FCP resistance were proposed. Intensifying Goss, P and Q textures and moderating these grains were an effective method to improve FCP resistance in Paris regime. However, in stage I, due to the predominated crack closure effect, large grain is beneficial for improving the threshold value of crack propagation. Principally, excellent FCP resistance could be obtained at a balance of crack deflection and crack closure.

Influence of plastic prestraining on the fatigue crack propagation rate of S355MC and S460MC structural steels

“…Ridges, with pronounced directionality parallel to the RD, covering the most part of the fracture surface, are observed, indicating the presence of surface irregularities on the crack propagation path (Figure 11B). The ridges on the fracture surface can occur due to texture caused by the cold forming process 37,38 . In the S355MC specimen with 12% plastic prestrain, similar observations are obtained with the unstrained specimen (Figure 11C).…”

In situ SEM fatigue testing technology for metallic materials: a review

“…Previous works indicate that the resistance to crack propagation caused by texture primarily results from crack deflection and crack closure effects. 3 Nevertheless, in comparison with the behavior of crack delamination and arrest at grain boundaries, the observation and quantification of crack closure emerge as more challenging tasks. Wang et al 59 studied the crack propagation behavior at the grain boundary of an aluminum alloy (7050-T7451) using the small time scale method, which relies on the in situ SEM fatigue technology.…”

“…Their primary aim is to establish a clear link between microstructure and fatigue performance, ultimately enhancing the fatigue performance of materials by optimizing the microstructure. [1][2][3] On the other hand, mechanical researchers often concentrate on predicting fatigue life and conducting damage tolerance analysis of materials or structural components in engineering applications. The focus of mechanical researchers has resulted in the development of widely utilized fatigue cumulative damage criteria and fatigue crack assessment methods in the industrial field.…”