EH36钢焊接接头预腐蚀下的疲劳性能及断裂机制研究

doi:10.3901/JME.2024.08.204

机械工程学报 ›› 2024, Vol. 60 ›› Issue (8): 204-211.doi: 10.3901/JME.2024.08.204

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EH36钢焊接接头预腐蚀下的疲劳性能及断裂机制研究

杨思愚¹, 徐连勇^1,2, 赵雷^1,2, 韩永典^1,2

1. 天津大学材料科学与工程学院天津 300350;
2. 天津市现代连接技术重点实验室天津 300350

收稿日期:2023-03-20 修回日期:2023-09-28 出版日期:2024-04-20 发布日期:2024-06-17
作者简介:韩永典(通信作者),1983年出生,博士,教授,博士研究生导师。主要从事焊接结构腐蚀及断裂方面的研究。E-mail:hanyongdian@tju.edu.cn;徐连勇,1975年出生,博士,教授,博士研究生导师。主要从事焊接结构方面的科研和教学工作,发表论文200余篇。E-mail:xulianyong@tju.edu.cn

Research on Corrosion Fatigue Performance and Fatigue Fracture Mechanism of Pre-corrosion EH36 Steel Welded Joints

YANG Siyu¹, XU Lianyong^1,2, ZHAO Lei^1,2, HAN Yongdian^1,2

1. School of Materials Science and Engineering, Tianjin University, Tianjin 300350;
2. Tianjin Key Laboratory of Modern Connection Technology, Tianjin 300350

Received:2023-03-20 Revised:2023-09-28 Online:2024-04-20 Published:2024-06-17

摘要/Abstract

摘要： 通过盐雾腐蚀试验和腐蚀疲劳试验研究不同盐雾腐蚀时间下EH36钢焊接接头的腐蚀疲劳性能。在盐雾环境中，试样的腐蚀产物主要为FeOOH、Fe₂O₃和Fe₃O₄，试样表面出现了大量的点蚀坑，盐雾腐蚀速率和最大点蚀坑深度随腐蚀时间的增大而增大。对比不同盐雾腐蚀时间下试样的腐蚀疲劳寿命发现，盐雾腐蚀后疲劳试样的寿命降低35%～77%，盐雾腐蚀时间对试样腐蚀疲劳性能的影响随应力范围的降低而增大。试样疲劳断口形貌显示，未经盐雾腐蚀处理的疲劳试样和盐雾腐蚀疲劳试样的腐蚀疲劳裂纹都萌生于裂纹源区内EH36钢焊接接头表面的点蚀坑。前者表面的点蚀坑由腐蚀和应力的共同作用产生，后者表面的点蚀坑在盐雾腐蚀过程中产生。两种试样的裂纹扩展区瞬间断裂区的微观形貌相似。盐雾腐蚀对腐蚀疲劳性能的影响主要体现在盐雾腐蚀产生的点蚀坑降低了疲劳试样的裂纹萌生寿命。

关键词: 盐雾腐蚀, 腐蚀疲劳, EH36钢, 断口特征, 腐蚀性能

Abstract: The corrosion fatigue performance of EH36 steel welded joints with different salt spray corrosion time were studied by salt spray corrosion test and corrosion fatigue test. According to the results of salt spray test, the corrosion products of the specimen were FeOOH, Fe₂O₃ and Fe₃O₄ and a large number of pits distributed on the surface of the specimen. The salt spray corrosion rate and the maximum pitting depth increased with corrosion time. Comparing the corrosion fatigue life of specimens with different salt spray corrosion time, it was found that the life of specimens after salt spray corrosion was reduced 35%-77%. The influence of salt spray corrosion time on the corrosion fatigue performance increased with the decrease of stress range. The fatigue fracture morphology of the specimens showed that the corrosion fatigue cracks of the specimens without salt spray corrosion and the salt spray corrosion specimen both originated from the pits on the surface. The pits on the surface of the former were produced by the interaction of corrosion and stress, and the pits on the surface of the latter were produced by salt spray corrosion. The micro morphology of the crack propagation zone and the instantaneous fracture zone were similar. The influence of salt spray corrosion on corrosion fatigue performance was mainly reflected in that the pits produced by salt spray corrosion reduce the crack initiation life of fatigue samples.

Key words: salt spray corrosion, corrosion fatigue, EH36 steel, fracture characteristics, corrosion performance

中图分类号:

TG405

杨思愚, 徐连勇, 赵雷, 韩永典. EH36钢焊接接头预腐蚀下的疲劳性能及断裂机制研究[J]. 机械工程学报, 2024, 60(8): 204-211.

YANG Siyu, XU Lianyong, ZHAO Lei, HAN Yongdian. Research on Corrosion Fatigue Performance and Fatigue Fracture Mechanism of Pre-corrosion EH36 Steel Welded Joints[J]. Journal of Mechanical Engineering, 2024, 60(8): 204-211.

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EH36钢焊接接头预腐蚀下的疲劳性能及断裂机制研究

Research on Corrosion Fatigue Performance and Fatigue Fracture Mechanism of Pre-corrosion EH36 Steel Welded Joints

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