摘要
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。
The electrochemical permeation technique was used to study thetrapping and transport phenomena of hydrogen in 18 Ni maraging steel.Theapparent diffusivity decreased as the amount and the density of precipitateinterfaces which act as trapping sites of hydrogen increased in the steel,andthere is a minimum when the steel is aged at 500℃ for 3h.The trap bindingenergy and the trap density are estimated as 10.0kJ/mol and 3.4x10^(26)/m^3respectively.Finally,several important problems which are associated withthe electrochemical permeation experiment were discussed.
关键词
电化学渗透法
氢陷阱
捕集
dectrochemical permeation technique
apparent diffusivity of hydrogen
hydrogen trap
trapping
