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采用正电子湮没寿命方法研究了国产改进型316L不锈钢的微结构及其温度变化。该不锈钢含有单空位、双空位、位错和小空位团等缺陷。经400、600、800℃退火后,单空位、双空位和位错缺陷分别消失。小空位团是由四空位和五空位构成的空位团。低于200℃退火时,缺陷复合五空位团成分随退火温度升高而增大;高于400℃时,空位团分裂,五空位团成分减少;800℃退火仍存在较低浓度的四空位团。
The positron annihilation lifetime method was applied to study the microstructure and temperature variation of domestic modified 316L stainless steel. The stainless steel contains single vacancies, double vacancies, dislocations and small spacers and other defects. After annealing at 400,600,800 ℃, single vacancy, double vacancy and dislocation defects disappear. Small space group is composed of four vacancies and five vacancies vacant group. When annealed below 200 ℃, the composition of the defect compound pentafacies increases with annealing temperature. When the temperature is higher than 400 ℃, the vacancy cluster splits and the composition of the five vacancy groups decreases. At 800 ℃, there still exist four vacancy groups .