应力比对服役后X56钢腐蚀疲劳裂纹扩展速率的影响

doi:10.11896/cldb.21040303

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Abstract To study the corrosion fatigue crack growth rate (FCGR) of the API 5L X56 pipe-in-pipe submarine pipeline after service, fatigue crack growth (FCG) tests with different stress ratios (R=0.1, 0.2, 0.3, 0.4, 0.5) were carried out on standard compact tensile (CT) specimens taken from the pipeline in seawater and air, respectively. At the initial stage of stable crack growth, within a given stress intensity factor range (ΔK=35 MPa·m^0.5), the fatigue crack growth rate (da/dN) of the X56 steel after service in seawater is about 1.64 times that in air, and with the increase of ΔK, the influence of seawater decreases gradually. A comprehensive analysis of the effect of stress ratio on the fatigue crack growth curves of the X56 steel in seawater is conducted. It is found that stress ratio has a great influence on the FCGR in the initial stage of stable crack growth. A low-stress ratio (R=0.1, 0.2, 0.3) has little effect on the fatigue crack growth rate in the intermediate stable stage of stable crack growth, while a high-stress ratio (R=0.4, 0.5) increases the fatigue crack growth rate in the whole stage of stable crack growth. The fatigue fracture faces of different CT specimens observed by scanning electron microscopes are all transcrystalline fractures. In seawater, as stress ratio increases, the crystal face area and the height difference of the cleavage step formed by cleavage fracture gradually decrease and the fatigue fracture face becomes flatter. Accordingly, the fatigue crack propagation mode changes from tearing to cleaving.

Key words： X56 steel pipe-in-pipe stress ratio seawater Paris law fatigue crack growth rate

Published: 10 August 2022 Online: 2022-08-15

CLC number:

TG172. 5

Fund:National Natural Science Foundation of China(52078441), Sichuan Youth Science and Technology Innovation Research Team(2019JDTD0017), and Science and Technology Innovation Seedling Project of Sichuan Province(2020039).

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	GAO Xudong
	SHAO Yongbo
	GUO Yongjian
	ZHONG Ying
	LUO Xiafei

Cite this article:

GAO Xudong,SHAO Yongbo,GUO Yongjian, et al. Effect of Stress Ratio on the Corrosion Fatigue Crack Growth Rate of X56 Steel After Service[J]. Materials Reports, 2022, 36(15): 21040303-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21040303 OR http://www.mater-rep.com/EN/Y2022/V36/I15/21040303

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