用电解渗透技术研究了低碳钢中微量Ti对氢扩散的影响。结果表明,钢中弥散的TiC沉淀相对氢有强的捕集能力。低碳钢中析出碳化钛在钢的α→γ相变前后平均捕集能分别为27.88±0.18和21kJ/mol,与Pressouyre报道的值94.55kJ/mol相差较大。成分为Fe-0.2Ti-0.1C的试样经1200℃真空淬火后,在550℃附近时效,具有最低的表观氢扩散系数。这可能与低碳钢中Ti的低温析出物的非立方结构及大量缺位有关。
The influence of Ti on hydrogen diffusion in low carbon steel was studied by Davanathan's electrochemical method. The experimental results show that the strong trapping of hydrogen is appeared in the steel in which the Ti precipitated as dispersed TiC during aging after solution treatment. The trapping energies of the precipitation of dispered TiC are evaluated as 27.88±0.18 and about 21 kJ/mol respectively before and after the α→γ phase transformation of the steel. However, these do not coincide with the value of 94.55 kJ/mol reported by Pressouyre. The lowest apparent diffusion coefficient of hydrogen in the steel Fe-0.2Ti-0.1C is found after solution-treated at 1200℃ and aged at 550℃. It seems to be caused by the low temperature precipitate TiC with non-cubic structure and by many lattice vacancies which distort the local periodical potential fields around it.
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