Effects of alloying elements and heat treatment on hydrogen diffusion in SCRAM steels
| Autor: | Hui Lu, Jinping Suo, Chunlan Luo, Yan Wang, Chi Yu, Gaoyong Xu, Juexin Xu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Quenching
Nuclear and High Energy Physics Materials science Hydrogen Diffusion Thermodynamics chemistry.chemical_element 02 engineering and technology Permeation 021001 nanoscience & nanotechnology Thermal diffusivity 01 natural sciences 010305 fluids & plasmas Nuclear Energy and Engineering chemistry Martensite 0103 physical sciences Volume fraction General Materials Science Tempering 0210 nano-technology |
| Zdroj: | Journal of Nuclear Materials. 516:135-143 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2019.01.019 |
| Popis: | In this paper, the effects of alloying elements Ti and N, different heat treatments and permeation temperature on hydrogen diffusion in SCRAM steels were investigated. Devanathan-Stachurshi electrochemical hydrogen permeation technique was used to determine the hydrogen diffusivity. The results show that increasing the content of Ti and N can decrease the hydrogen diffusion coefficient of SCRAM steels. Compared with the traditional quenching and tempering heat treatment process, the process including an intermediate hold can refine the M23C6 phase, increase the volume fraction of MX phase but coarsen the martensitic lath. The twice quenching and tempering heat treatment process can not only refine the martensitic lath and M23C6 phase, but also increase the volume fraction of MX phase, resulting in a decrease of hydrogen diffusivity. The hydrogen permeation steady-state current density and the hydrogen diffusivity increase with the rise of permeation temperature. The temperature dependence of hydrogen diffusion coefficient conforms with the Arrhenius relationship. And the activation energy for hydrogen diffusion of two SCRAM steels with different heat treatments was determined. |
| Databáze: | OpenAIRE |
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