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材料导报  2022, Vol. 36 Issue (15): 21040303-6    https://doi.org/10.11896/cldb.21040303
  金属与金属基复合材料 |
应力比对服役后X56钢腐蚀疲劳裂纹扩展速率的影响
高旭东1, 邵永波1,2,*, 郭永健2, 钟颖2, 罗霞飞1
1 西南石油大学机电工程学院,成都 610500
2 西南石油大学土木工程与测绘学院,成都 610500
Effect of Stress Ratio on the Corrosion Fatigue Crack Growth Rate of X56 Steel After Service
GAO Xudong1, SHAO Yongbo1,2,*, GUO Yongjian2, ZHONG Ying2, LUO Xiafei1
1 School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China
2 School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, China
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摘要 为研究服役后API 5L X56钢海底输油双层管道的腐蚀疲劳裂纹扩展速率(FCGR),分别在海水和空气环境下对管道上截取的标准紧凑拉伸(CT)试样进行不同应力比(R=0.1、0.2、0.3、0.4、0.5)的疲劳裂纹扩展(FCG)试验。稳定裂纹扩展初期,在给定的应力强度因子幅值(ΔK=35 MPa·m0.5)下,服役后X56钢在海水环境下的疲劳裂纹扩展速率(da/dN)约为空气中的1.64倍;随着ΔK的增大,海水腐蚀作用越来越小。综合分析应力比对海水环境下X56钢的疲劳裂纹扩展曲线的影响,结果发现:应力比对裂纹稳定扩展初期阶段的疲劳裂纹扩展速率影响较大,低应力比(R=0.1、0.2、0.3)对裂纹稳定扩展中间稳定阶段的疲劳裂纹扩展速率影响较小,高应力比(R=0.4、0.5)状态下裂纹稳定扩展整个阶段的腐蚀疲劳裂纹扩展速率明显提高。扫描电镜下CT试样的疲劳断口均为穿晶型断裂。海水腐蚀环境中,随着应力比的增大,解理断裂形成的解理台阶的晶面面积和高度差逐渐减小,疲劳断口越来越平坦,疲劳裂纹扩展方式由撕裂型向解理型进行转变。
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高旭东
邵永波
郭永健
钟颖
罗霞飞
关键词:  X56钢  双层管  应力比  海水  Paris定理  疲劳裂纹扩展速率    
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·m0.5), 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
出版日期:  2022-08-10      发布日期:  2022-08-15
ZTFLH:  TG172. 5  
基金资助: 请扫描二维码访问本文网络展示页面以获取补充信息(Supplementary Information) 国家自然科学基金(52078441);四川省青年科技创新研究团队(2019JDTD0017);四川省科技创新苗子工程(2020039)
通讯作者:  *ybshao@swpu.edu.cn   
作者简介:  高旭东,2016年毕业于辽宁石油化工大学,获得学士学位。2017年9月至今在西南石油大学机电工程学院攻读博士学位。
邵永波,教授,博士研究生导师。本科和硕士研究生毕业于清华大学工程力学系,2005年获得新加坡南洋理工大学博士学位。发表学术论文140余篇,其中SCI收录80余篇。一直从事结构工程、海洋工程钢结构和机械强度理论方面的教学科研工作。专注于钢结构疲劳断裂、抗震、抗火、抗冲击性能及结构安全评估和加固方面的研究。
引用本文:    
高旭东, 邵永波, 郭永健, 钟颖, 罗霞飞. 应力比对服役后X56钢腐蚀疲劳裂纹扩展速率的影响[J]. 材料导报, 2022, 36(15): 21040303-6.
GAO Xudong, SHAO Yongbo, GUO Yongjian, ZHONG Ying, LUO Xiafei. Effect of Stress Ratio on the Corrosion Fatigue Crack Growth Rate of X56 Steel After Service. Materials Reports, 2022, 36(15): 21040303-6.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.21040303  或          http://www.mater-rep.com/CN/Y2022/V36/I15/21040303
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