海水环境下船用高强钢腐蚀疲劳损伤行为研究  

Study on Corrosion Fatigue Damage Behavior of Marine High-strength Steel in Seawater Environment

作　　者：张若楠 韦朋余[2] 王珂[3] 曾庆波[2] 王连 宋培龙 ZHANG Ruonan;WEI Pengyu;WANG Ke;ZENG Qingbo;WANG Lian;SONG Peilong(Taihu Laboratory of Deepsea Technological Science,Wuxi 214082,Jiangsu,China;China Ship Scientific Research Center,Wuxi 214082,Jiangsu,China;School of Naval Architecture&Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,Jiangsu,China)

机构地区：[1]深海技术科学太湖实验室,江苏无锡214082 [2]中国船舶科学研究中心,江苏无锡214082 [3]江苏科技大学船舶与海洋工程学院,江苏镇江212003

出　　处：《材料导报》2024年第23期178-183,共6页Materials Reports

基　　金：国家重点研发计划(2022YFB3404800)。

摘　　要：腐蚀疲劳损伤严重影响海洋装备的安全服役,为研究装备在海水环境下的裂纹扩展规律及腐蚀疲劳损伤机理,本工作针对典型船用高强钢10CrNi3MoV,开展了空气与海水环境下的疲劳裂纹扩展试验,对比分析了海水环境对疲劳裂纹扩展速率与疲劳寿命的影响作用,获得了船用高强钢腐蚀疲劳行为历程。在此基础上,结合腐蚀疲劳断口形貌观测与腐蚀产物分析,探察了典型船用高强钢腐蚀疲劳损伤机理。研究结果表明:船用高强钢10CrNi3MoV的疲劳损伤起始于基材表面不均匀电化学反应导致的金属表面点蚀坑,并在腐蚀与疲劳联合作用下逐渐演化成微裂纹,海水环境会显著加速疲劳裂纹扩展,缩短疲劳寿命,海水环境下的疲劳寿命约为空气环境下的46.15%。随着裂纹扩展速率增加,相较于海水腐蚀,机械疲劳损伤对裂纹扩展的影响占主导地位,有解理特征的阳极溶解是船用高强钢腐蚀疲劳损伤的主要作用机理。Corrosion fatigue damage affects the safe service of marine equipment seriously.In order to study the crack propagation law and corrosion fatigue damage mechanism of marine equipment in seawater environment,fatigue crack growth tests in air and seawater environment for marine high-strength steel 10CrNi3MoV were carried out.And the influence of sea water environment on fatigue crack growth rate by comparing different crack growth rates(CGR)and fatigue life in air and seawater environment were analyzed,and the corrosion fatigue behavior history of marine high-strength steel was obtained.Based on the observation of corrosion fatigue fracture morphology and the analysis of corrosion products,the corrosion fatigue damage mechanism of typical marine high-strength steel was revealed.The research results showed that corrosion fatigue damage starts from the pitting corrosion pits on the metal caused by the uneven electrochemical reaction on the surface of the substrate,and gradually evolves into microcracks under the combined action of corrosion and fatigue.Seawater environment has a significant impact on the CGR and fatigue life,significantly accelerating crack propagation and reducing fatigue life.With the increase of the CGR,the influence of mechanical fatigue damage on the crack growth is dominant compared with seawater corrosion.What’s more,anodic dissolution with cleavage characteristics is the main mechanism in the corrosion fatigue damage evolution process of marine high-strength steel.

关 键 词：海水环境 船用高强钢 腐蚀疲劳 裂纹扩展 损伤机理 

分 类 号：U663[交通运输工程—船舶及航道工程]