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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.
The apparent diffusion coefficient of hydrogen at 20-80 ℃ in cold-deforming and annealing industrial pure iron was measured by electrochemical hydrogen permeation technique. The linear parameters were measured by positron-Doppler broadening technique. According to Oriani low occupancy fraction (θ_x << 1) Model Analysis The diffusion data obtained the dislocation stress field, and the △ Ex of the grain boundaries and the subgrain boundaries were 24300 ± 2200 J / mol and 14400-18100 J / mol, respectively. The cold deformation α- After the low-temperature annealing of Fe (deformation of 38% -50% below 450 ° C, deformation of 13% -25% below 250 ° C), the main hydrogen trap trap is dislocated above which the grain boundaries and sub- The community becomes the main trap of hydrogen.