论文部分内容阅读
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 effect of trace Ti on the diffusion of hydrogen in low carbon steel was studied by electrolytic permeation technique. The results show that the dispersed TiC in steel has a strong ability of trapping hydrogen. The average trapping energies of precipitated titanium carbide in low carbon steel before and after α → γ phase transformation of steel are 27.88 ± 0.18 and 21kJ / mol, respectively, which are quite different from those reported by Pressouyre of 94.55kJ / mol. The sample with the composition of Fe-0.2Ti-0.1C was vacuum-hardened at 1200 ℃ and aged at 550 ℃ with the lowest apparent hydrogen diffusion coefficient. This may be related to the non-cubic structure of low temperature precipitates of Ti and the absence of a large number of vacancies in low carbon steel.