Natural Seawater Impact on Crack Propagation and Fatigue Behavior of Welded Nickel Aluminum Bronze

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2024-10-08 DOI:10.1111/ffe.14456

T. H. E. Dobson, P. Wilson, N. O. Larrosa, M. Williams, H. E. Coules

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Abstract

Nickel aluminum bronze (NAB) is a complex alloy used extensively in the marine environment. Fatigue strength of NAB is reduced by welding and prior seawater corrosion. This study investigated the combined effect of corrosion and plasma welding on the fatigue behavior of NAB. Natural seawater corroded samples were used in tension-tension cyclic loading tests to observe fatigue crack initiation, propagation, and failure. Fatigue cracks initiated from corrosion pits at the weld toe. Stress corrosion and fatigue cracks propagated along the path of β′ and κ_III phases. A short crack growth model (SCGM) predicted fatigue strength using experimentally obtained material properties and corrosion pit dimensions. Model predictions were used to develop S-N curves and were within 30% of experimental results. The SCGM produced accurate and reliable fatigue life results that could be applied by industry to aid in revalidation decision making and inspection scheduling.

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天然海水对焊接镍铝青铜裂纹扩展和疲劳行为的影响

镍铝青铜（NAB）是一种在海洋环境中广泛使用的复杂合金。焊接和先前的海水腐蚀会降低 NAB 的疲劳强度。本研究调查了腐蚀和等离子焊接对 NAB 疲劳行为的综合影响。在拉伸-张力循环加载试验中使用了天然海水腐蚀样品，以观察疲劳裂纹的产生、扩展和破坏。疲劳裂纹从焊趾处的腐蚀坑开始。应力腐蚀和疲劳裂纹沿着 β′ 和 κIII 相的路径扩展。短裂纹生长模型（SCGM）利用实验获得的材料特性和腐蚀坑尺寸预测了疲劳强度。模型预测结果用于绘制 S-N 曲线，与实验结果的误差在 30% 以内。SCGM 得出的疲劳寿命结果准确可靠，可用于工业领域，帮助重新验证决策和检查计划的制定。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.