Corrosion fatigue cracking behaviors of Q690qE high-strength bridge steel as a weld joint in simulated marine environment

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2024-09-01 DOI:10.1111/ffe.14427

Cuiping Lu, Qiong Yao, Ningning Li, Liyang Sun, Wenhe Dai, Chuang Zhang, Hongchi Ma

引用次数: 0

Abstract

Corrosion fatigue behavior and mechanism of the weld joint of Q690qE high-strength bridge steel was investigated in a simulated marine environment. It reveals the sub-critical heat-affected zone (SCHAZ) and coarse-grained heat-affected zone (CGHAZ) are the most vulnerable sites to corrosion fatigue cracking. The CGHAZ of the Q690qE steel weld joint was prone to corrosion fatigue initiation mainly because of micro-galvanic corrosion between CGHAZ and weld metal (WM). The corrosion fatigue failure in SCHAZ mainly resulted from local stress/strain concentration due to weld softening. The final fracture location was determined by the competition between these two effects.

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模拟海洋环境中作为焊接接头的 Q690qE 高强度桥梁钢的腐蚀疲劳开裂行为

在模拟海洋环境中研究了 Q690qE 高强度桥梁钢焊接接头的腐蚀疲劳行为和机理。结果表明，亚临界热影响区（SCHAZ）和粗晶粒热影响区（CGHAZ）是最容易出现腐蚀疲劳裂纹的部位。Q690qE 钢焊接接头的 CGHAZ 容易发生腐蚀疲劳开裂，主要原因是 CGHAZ 与焊缝金属 (WM) 之间存在微电镀腐蚀。SCHAZ 的腐蚀疲劳失效主要是由于焊接软化导致的局部应力/应变集中造成的。最终的断裂位置取决于这两种效应之间的竞争。

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.