一种超低碳耐候钢的组织和性能研究  

Research on Microstructure and Performance of A Ultra-low Carbon Weathering Steel

作　　者：刘志勇[1] 汪兵[2] 陈吉清[1] LIU Zhiyong;WANG Bin;CHEN Jiqing(Wuhan Iron and Steel(Group)Corp,Wuhan 430080,China;Central Iron and Steel Research Institute,Beijing 100083,China)

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080 [2]钢铁研究总院,北京100083

出　　处：《热加工工艺》2020年第2期56-58,共3页Hot Working Technology

摘　　要：试制了一种450MPa级超低碳高强度耐候钢(ULCW),通过力学性能检测、加速腐蚀实验、金相组织观察、透射电镜观察和锈层交流阻抗特征分析研究了实验钢的组织、力学性能及耐腐蚀性能,并与商业CortenB钢的腐蚀性能进行了对比分析。结果表明:超低碳高强度耐候钢具有良好的强韧匹配;耐腐蚀性能明显优于CortenB钢;与CortenB钢相比较,超低碳耐候钢的锈层腐蚀电位正移,自腐蚀电流密度减小,锈层的阳极溶解反应受到阻碍,提高了钢的耐腐蚀性。A 450 MPa grade ultra-low carbon high strength weathering steel was trial manufactured.The microstruture,mechanical properties and corrosion resistance of the experiment steel were investigated by optical micrographs observation,transmission electronic microscope(TEM),accelerated corrosion test and electrochemical impedance spectra techniques.The results show that the ULCW steel has good strength-toughness matching.The corrosion resistance is superior to that of CortenB steel.Compared with CortenB steel,the corrosion potential of rust layer of ULCW steel becomes more positive,and the self-corrosion current density decreases,the anode dissolution reaction of the rust layer is impeded,and then the corrosion resistance of the steel improves.

关 键 词：超低碳耐候钢 腐蚀 组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]