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本文运用电化学渗透技术研究了18Ni 马氏体时效钢的氢扩散和捕集现象。结果表明,时效试样内存在析出相颗粒,使表观氢扩散系数减小,其原因是析出相界面捕集氢,阻滞了氢输运过程的进行;并发现500℃时效3h 表观扩散系数最小,扩散激活能最大,因为该制度时样品内析出相颗粒的数量最多,分布最弥散,此时的析出相界面捕集能为10.0kJ/mol,陷阱密度(室温时)为3.4×10~(26)/m~3。最后就常规双电解池式的电化学渗透实验,分析和讨论了几个值得注意的问题。
In this paper, the electrochemical diffusion of 18Ni martensitic steel hydrogen diffusion and capture phenomenon. The results show that precipitated phase particles exist in the aged sample, and the apparent hydrogen diffusion coefficient decreases due to the trapping of hydrogen at the precipitated phase interface, which hinders the hydrogen transport process. Apparent diffusion at 500 ℃ for 3h The coefficient is the smallest and the diffusion activation energy is the largest because the largest number of precipitated phase particles and the most dispersed phase in this system are the trapped energy at the precipitated phase interface of 10.0 kJ / mol and the trap density (at room temperature) of 3.4 × 10 ~ (26) / m ~ 3. Finally, the conventional electrochemical cell-type two-cell infiltration experiments, analysis and discussion of several noteworthy issues.