应力比对EH36钢在海洋腐蚀环境中疲劳裂纹扩展速率的影响

doi:10.11896/cldb.22050330

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Abstract EH36 steel is widely used in large offshore platforms due to its high strength, excellent toughness at low temperature and light weight. To eva-luate the influence of stress ratio on the corrosion fatigue performance of EH36 steel in the marine corrosive environment, the fatigue crack growth tests of EH36 steel were carried out in laboratory air, seawater environment and splashing environment at three different stress ratios (R=0.1, 0.3, 0.5), respectively. It is concluded that the fatigue crack growth rate of EH36 steel was accelerated by increasing stress ratio R in all three environments for a given value of the stress intensity factor range (ΔK). The stress ratio R has great influence on the crack growth rate in air, but has little effect on the material constants C and m. Increasing the stress ratio in the seawater and splashing environment promotes crack growth and changes the material constants C and m as well. It is evident that the crack growth rates in seawater and splashing environment are higher than those in the air under the same loading conditions, and the effects of both corrosion environments have almost identical effects on fatigue crack growth behavior. The fracture morphology of the specimens in the air environment shows quasi-cleavage fracture characteristics. It is almost the same fracture morphology in both corrosion environments, which is close to cleavage fracture.

Key words： EH36 steel seawater splash environment stress ratio fatigue crack growth rate fracture morphology

Published: 10 October 2023 Online: 2023-09-28

CLC number:

TG172.5

Fund:National Natural Science Foundation of China (52078441).

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	Articles by authors
	ZHONG Ying
	SHAO Yongbo
	GAO Xudong
	LUO Xiafei
	ZHU Hongmei
	YANG Dongping

Cite this article:

ZHONG Ying,SHAO Yongbo,GAO Xudong, et al. Effect of Stress Ratio on Fatigue Crack Growth Rate of EH36 Steel in the Marine Corrosive Environment[J]. Materials Reports, 2023, 37(19): 22050330-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22050330 OR http://www.mater-rep.com/EN/Y2023/V37/I19/22050330

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