力学-电化学交互作用下E690钢的腐蚀疲劳裂纹扩展速率理论模型
Corrosion Fatigue Crack Growth Rate Theoretical Model ofE690 Steel under Mechanics-Electrochemistry Interaction
摘 要
基于腐蚀疲劳中力学-电化学交互作用过程的能量转换,利用能量守恒、电化学热力学及腐蚀电化学原理,研究在腐蚀疲劳体系中动能、势能以及阳极溶解电化学能的变化,建立E690高强钢的腐蚀疲劳裂纹扩展速率理论模型,并通过腐蚀疲劳裂纹扩展试验验证该理论模型的准确性。结果表明:质量分数3.5% NaCl溶液会加速E690高强钢疲劳裂纹初期的扩展,降低疲劳寿命,应力比的提高会明显加速腐蚀疲劳裂纹扩展,同时降低裂纹扩展门槛值;理论模型计算得到疲劳裂纹扩展速率与试验结果基本吻合,相对误差小于10%,说明该模型可以很好地描述E690高强钢的腐蚀疲劳裂纹扩展行为。
裂纹扩展
能量守恒
理论模型
E690高强钢
corrosion fatigue
crack growth
energy conservation
theoretical model
E690 high strength steel
Abstract
Based on the energy conversion during the mechanics-electrochemistry interaction in corrosion fatigue, the change of kinetic energy, potential energy and anodic dissolution electrochemical energy in corrosion fatigue system was studied by the energy conservation, electrochemical thermodynamics and corrosion electrochemical principles. A theoretical model of corrosion fatigue crack growth rate for E690 high strength steel was established, and the accuracy of the theoretical model was verified by corrosion fatigue crack growth test. The results show that 3.5wt% NaCl solution accelerated the initial propagation of fatigue crack of E690 high strength steel and reduced the fatigue life. The increase of stress ratio could significantly accelerate the corrosion fatigue crack propagation and reduce the threshold of crack propagation. The fatigue crack growth rate calculated by the theoretical model was basically consistent with the experimental results, and the relative error was less than 10%, indicating that the model could well describe the corrosion fatigue crack growth behavior of E690 high strength steel.
中图分类号 TG17 DOI 10.11973/jxgccl202206010
所属栏目 物理模拟与数值模拟
基金项目 江苏省自然科学基金资助项目(BK20151271);江苏省成果转化专项资金资助项目(BA2013099)
收稿日期 2021/1/11
修改稿日期 2021/12/28
网络出版日期
作者单位点击查看
备注马剑军(1979-),男,江苏南通人,工程师,学士通信作者:王恒教授
引用该论文: MA Jianjun,LIU Xiao,WANG Heng. Corrosion Fatigue Crack Growth Rate Theoretical Model ofE690 Steel under Mechanics-Electrochemistry Interaction[J]. Materials for mechancial engineering, 2022, 46(6): 57～63
马剑军,刘肖,王恒. 力学-电化学交互作用下E690钢的腐蚀疲劳裂纹扩展速率理论模型[J]. 机械工程材料, 2022, 46(6): 57～63
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【5】EBARA R.The influence of metallurgical factors on corrosion fatigue strength of stainless steels[J].Procedia Structural Integrity,2016,2:517-524.
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【8】张杰,蔡庆伍,樊艳秋,等.回火温度对E690海洋用钢组织和显微硬度的影响[J].材料热处理学报,2012,33(4):55-61. ZHANG J,CAI Q W,FAN Y Q,et al.Effect of tempering temperature on microstructure and microhardness of an E690 off-shore steel[J].Transactions of Materials and Heat Treatment,2012,33(4):55-61.
【9】马宏驰,刘智勇,杜翠薇,等.SO2质量分数对污染海洋大气环境中高强钢E690腐蚀行为的影响[J].机械工程学报,2016,52(16):33-41. MA H C,LIU Z Y,DU C W,et al.Effect of SO2 content on corrosion behavior of high-strength steel E690 in polluted marine atmosphere[J].Journal of Mechanical Engineering,2016,52(16):33-41.
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