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| Effect of V and Nb on Hydrogen Traps in High Strength Low Alloy Steel |
PENG Hao, CHENG Xiaoying( ), LI Xiaoliang, WANG Zhaofeng, CAI Zhenxiang |
| Institute of Materials, Shanghai University, Shanghai 200072, China |
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Abstract 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.
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Received: 08 April 2022
32134.14.1005.4537.2022.097
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| Fund: National Natural Science Foundation of China(51871145) |
About author: CHENG Xiaoying, E-mail: chengxy@staff.shu.edu.cn
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