【摘要】 对Ｆｅ－３０％Ｎｉ合金和超低碳贝氏体钢在高温进行不同方式变形和保温，通过变形、回复、与再结晶，获得不同的晶体缺陷数量与构型住要是位错分布形态）．用硼径迹显微照相技术研究了空冷过程中硼向晶界的非平衡偏聚及与不同形态晶体缺陷的关系．结果表明，在再结晶新晶粒冷却时晶界偏聚明显，晶界附近会出现较显著的贫硼现象，而变形并回复后的原始晶粒中此现象不明显，高温回复阶段形成的多边形化亚晶界（位错墙）对冷却时硼向晶界非平衡偏聚过程有明显影响，而刚变形时形成的高密度离散分布的位错对冷却时硼非平衡偏聚过程作用不明显，硼原子偏聚过程与位错的相互作用对位错分布的形态敏感．更多还原

【Abstract】 Different densities and configurations of crystal defects (i.e. dislocations distributions) were obtained in austenites of Fe-30%Ni alloy and an ultra low carbon bainitic steel by different deformations and annealing times at high temperature, including different recovery and recrystallization processes. The boron non-equilibrium segregation on grain boundaries during air cooling and its relations to crystal defects were revealed by means of particle tracking autoradiography technique. It was found that boron segregation was significant on new grain boundaries and boron depletion was more in the recrystallized grains than in the deformed original grains during the cooling. The grain boundaries and subgrain boundaries had a significant effect on the boron non-equilibrium segregation during air cooling, and the dispersed dislocations had weak effect. The results indicated that the interaction of boron atom with dislocations was sensitive to dislocation configuration.更多还原