加载频率对EH36/EH690异种高强钢焊接接头腐蚀疲劳裂纹扩展行为的影响

doi:10.11896/cldb.24090131

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Abstract To investigate the effect of loading frequency on the corrosion fatigue crack growth behavior of EH36/EH690 dissimilar high-strength steel welded joints in a fully submerged seawater environment, corrosion fatigue crack growth tests were conducted at different loading frequencies (f=0.2, 0.3, 0.5, and 0.7 Hz) on the heat-affected zone (HAZ36) material near the EH36 base metal, the heat-affected zone (HAZ690) material near the EH690 base metal, and the weld metal (WM). The crack length-fatigue life curves and corrosion fatigue crack growth rate-stress intensity factor range curves were obtained for the materials in different regions of the welded joints. The results indicate that the presence of the seawater corrosion environment significantly accelerates the fatigue crack growth rate of the welded joints. Under the same loading frequency, the corrosion fatigue crack growth rates(CFCGR) vary in different regions of the welded joints in the seawater corrosion environment, with an order from largest to smallest of CFCGR_HAZ36＞CFCGR_WM＞CFCGR_HAZ690. Under different loading frequencies, the materials in the HAZ36, HAZ690, and WM regions all exhibit a trend of higher corrosion fatigue crack growth rates and shorter fatigue life as the frequency decreases. Microscopic fracture surface analysis reveals that the fatigue fracture surfaces of CT specimens under all conditions display transgranular quasi-cleavage fracture characteristics.

Key words： dissimilar high-strength steel welded joint corrosion fatigue crack growth loading frequency seawater immersion fracture morphology

Published: Online: 2025-10-27

CLC number:

TG172.5

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	Articles by authors
	WANG Mengna
	GAO Xudong
	SHAO Yongbo
	ZHU Hailong
	DU Xiyun

Cite this article:

WANG Mengna,GAO Xudong,SHAO Yongbo, et al. Effect of Loading Frequency on Corrosion Fatigue Crack Growth Behavior of EH36/EH690 Dissimilar High-strength Steel Welded Joints[J]. Materials Reports, 2025, 39(20): 24090131-9.

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https://www.mater-rep.com/EN/10.11896/cldb.24090131 OR https://www.mater-rep.com/EN/Y2025/V39/I20/24090131

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