摘要
采用未时效、200、400℃以及500℃时效状态下10Cr13Co13Mo5Ni3W1VE(S280)马氏体超高强度不锈钢为研究对象,通过X射线衍射(XRD)、透射电子显微镜(TEM)、背散射电子衍射(EBSD)等测试方法,结合电化学测试手段与X射线光电子能谱仪(XPS)测试,分析S280的微观组织结构特征演变与钝化膜结构成分与耐蚀性能,研究钝化膜稳定性特征与材料微观组织结构的关系。结果表明:500℃时效温度下的S280钢有细小弥散的富含Cr,Mo元素的析出相,分布在马氏体板条中。随着时效温度升高,无明显的残余奥氏体及逆转变奥氏体析出。在成膜电位(0.1~0.85 V)下,S280钝化膜在pH=8.5的硼酸盐缓冲液中呈p型半导体性质,表现为双层膜结构,外部由疏松多孔的Fe/Cr氢氧化物组成,内层由致密的Cr/Fe氧化物构成,其成分主要是Cr_(2)O_(3)。通过电化学阻抗测试结合Mott-Schottky分析,探明S280在200℃时效下耐蚀性最好,其耐蚀性能由晶界取向特性与沉淀相导致的元素偏析共同影响。
10Cr13Co13Mo5Ni3W1VE(S280) martensitic ultra-high-strength stainless steel under aging at 200, 400, and 500 ℃ was used as the research object. Through XRD,TEM,EBSD and other test methods, combined with electrochemical test methods and X-ray photoelectron spectroscopy(XPS) tests, the microstructure evolution of S280 and the structural composition and corrosion resistance of the passivation film were analyzed. The relationship between the stability characteristics of the passivation film and the microstructure of the material was studied. The results show that S280 steel aged at 500 ℃ has fine and dispersed precipitates with rich Cr and Mo elements distributed in martensite laths. As the aging temperature increases, there is no obvious precipitation of retained austenite and reverse transformed austenite. At the potential(0. 1-0. 85 V) of forming a passivation film, the S280 passivation film is a p-type semiconductor in a pH=8. 5 borate buffer solution, having a double-layer film structure. The outer layer is composed of loose and porous Fe/Cr hydroxide, and the inner layer is composed of dense Cr/Fe oxide whose composition is mainly Cr_(2)O_(3). The electrochemical impedance test combined with MottSchottky analysis proves that S280 steel aged at 200 ℃ has the best corrosion resistance. Its corrosion resistance is affected by the grain boundary characteristics and the element segregation caused by the precipitated phase.
作者
滕鹏
钟锦岩
匡效禹
赵振江
张淑琦
蔡嘉辉
李松梅
刘建华
于美
钟平
TENG Peng;ZHONG Jinyan;KUANG Xiaoyu;ZHAO Zhenjiang;ZHANG Shuqi;CAI Jiahui;LI Songmei;LIU Jianhua;YU Mei;ZHONG Ping(School of Materials Science and Engineering,Beihang University,Beijing 100191,China;Institute of Steels and Rare Precious Metals,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2024年第5期103-116,共14页
Journal of Materials Engineering
基金
国家自然科学基金项目(52001016)。
关键词
超高强度不锈钢S280
微观组织
钝化膜
局部腐蚀
ultra-high strength stainless steel S280
microstructure
passivation film
localized corrosion
