摘要
用电化学氢渗透技术测量了20—80℃氢在冷变形和退火工业纯铁中的表观扩散系数,用正电子多普勒增宽技术测量了其线形参数.根据Oriani低占据分数(θ_x<<1)模型分析扩散数据得出位错应力场,晶界及亚晶界对氢的捕获能(△Ex)分别是24300±2200J/mol和14400—18100J/mol.冷变形后的α-Fe在低温退火后(变形38%—50%低于450℃,变形13%—25%低于250℃),其主要氢捕获阱是位错,高于上述温度退火后,晶界和亚晶界成为氢的主要捕获阱.
Hydrogen diffusion coefficients in cold-deformed and annealed Armco-Fe are measured by the electrochemical hydrogen permeations technique in 20 -80℃, Their parameters of line shape are also measured by positron Dopier Broadening technique. Analysis of diffusion data by Oriani's model for the low occupation fraction (0x<《1 ) suggests that hydrogen trapping energy by dislocation stress field, grain and sub-grain boundary arc 24 300 ± 2 200J/mol and 14400-18 100J/mol. In case of those cold-deformed ( by 13%,25%,38%, 50%)α-Fe arc annealed at low tempcratures(38%-50% deformed α-Fe at 450℃ and 13%-25% deformed α-Fe at 250℃); The major hydrogen trapping site is dislocation stress field, The grain and sub-grain boundary are becoming the major hydrogen trapping site in these α-Fe as the annealing temperature increasing in advance.
出处
《江西科学》
1990年第4期9-17,共9页
Jiangxi Science
关键词
d-Fe
氢捕获
氢扩散
冷变形
退火
α-Fe, Hydrogen trapping, Dislocation, Grain and sub-grain boundary
