模拟海水环境下G20Mn5QT/Q355异种钢对接焊接接头腐蚀疲劳性能试验研究

doi:10.11896/cldb.22090030

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Abstract Corrosion fatigue failure of welded joints of metal materials often leads to serious engineering accidents. In this work, the corrosion fatigue behavior of butt-welded joints of G20Mn5QT/Q355D dissimilar steel is studied, and the corrosion fatigue test in 3.5wt%NaCl solution is carried out. The corrosion fatigue fracture is observed by scanning electron microscope (SEM), and the failure mechanism of corrosion fatigue is analyzed. It is revealed that the defects (casting defects and welding defects) are the main causes of crack nucleation under the larger stress level (≥220 MPa). However, under the smaller stress level (≤220 MPa), the corrosion pit on the surface is the main cause of crack nucleation. The corrosion fatigue S-N curves of butt welded joints are established by Stromeyer expression and three-parameter Weibull distribution, respectively. The results show that the corrosion fatigue S-N curve with three-parameter Weibull distribution is more applicable in the prediction of corrosion fatigue life.

Key words： G20Mn5QT cast steel butt welded joint corrosion fatigue failure mechanism S-N curves three-parameter Weibull distribution

Published: 10 October 2024 Online: 2024-10-23

CLC number:

TU391

Fund:National Natural Science Foundation of China (52278199, 52022067) and Tianjin Science and Technology Program(23ZYYYJC00010).

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	LU Yan
	YU Zhenchao
	WANG Ruqi

Cite this article:

LU Yan,YU Zhenchao,WANG Ruqi. Experimental Research on Corrosion Fatigue Behavior of G20Mn5QT/Q355D Dissimilar Steel Butt Welded Joint in Simulated Seawater[J]. Materials Reports, 2024, 38(19): 22090030-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22090030 OR http://www.mater-rep.com/EN/Y2024/V38/I19/22090030

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