高强度低合金钢中V和Nb对氢陷阱的影响  

Effect of V and Nb on Hydrogen Traps in High Strength Low Alloy Steel

作　　者：彭浩 程晓英[1] 李晓亮 王兆丰 蔡贞祥 PENG Hao;CHENG Xiaoying;LI Xiaoliang;WANG Zhaofeng;CAI Zhenxiang(Institute of Materials,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学材料研究所,上海200072

出　　处：《中国腐蚀与防护学报》2023年第2期415-420,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51871145)。

摘　　要：随着海洋资源的开发,传统高强度低合金钢已不能完全满足复杂的深海环境,通过添加合金元素来改善其抗氢脆性能。采用双电解池研究含与不含0.15%V+0.05%Nb合金元素的高强度低合金钢中氢扩散行为,并采用扫描电镜(SEM)、透射电镜(TEM)和X射线衍射分析(XRD)等方法测量原奥氏体晶粒大小和位错密度。根据原奥氏体晶粒尺寸和位错密度计算得到钢中可逆氢陷阱密度,并将其与氢分析仪测得钢中氢含量建立联系。结果表明,V与Nb能够通过在钢中形成碳化物使得原奥氏体晶粒细化和位错密度增加,引起钢中可逆氢陷阱密度增加,从而降低氢扩散系数以及提高钢中氢含量和氢扩散激活能。With the ultilization and development of deep-sea resources, the traditional high strength low alloy steel can not completely meet the service requirements for the complex deep-sea environment,therefore, it is necessary to find a new way to solve the hydrogen embrittlement. As an example, the hydrogen diffusion behavior of high strength low alloy steel with and without addition of 0.15%V+0.05%Nb was studied by using double cell method in this article. Meanwhile, the grain size of the prior austenite and dislocation density were measured by scanning electron microscope(SEM), transmission electron microscope(TEM) and X-ray diffractometer(XRD), respectively. The reversible hydrogen trap density in steel was calculated from the original austenite grain size and dislocation density, which was correlated with the hydrogen content in the steel measured by hydrogen analyzer. The results showed that V and Nb can increase the density of reversible hydrogen traps due to the grain refinement and the increase of dislocation density, which may result from the formation of carbides in steels, then reduce the hydrogen diffusion coefficient, as well as increase the activation energy of the hydrogen diffusion and hydrogen content in the steel.

关 键 词：高强度低合金钢 氢扩散 氢陷阱 位错密度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]