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

doi:10.3901/JME.2024.08.204

Abstract

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

CLC Number:

TG405

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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