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利用透射电镜研究了质子辐照对反应堆压力容器钢A508-3钢显微组织形态的影响,基于拍摄的铁素体与渗碳体的复合衍射花样,采用矩阵分析法研究了质子辐照前后试样铁素体与渗碳体之间的取向关系。结果表明,辐照前后A508-3钢的铁素体板条宽度和碳化物的尺寸、体积分数及分布没有发生明显变化。A508-3钢辐照至0.271 dpa时产生了分布较为均匀的位错环,位错环平均直径约为4.6 nm,数量密度约为2.7×1022m-3。在未辐照试样观察到铁素体和渗碳体的取向关系符合Bagaryatskii关系,而0.216 dpa和0.271 dpa辐照试样中观察到铁素体和渗碳体之间出现了3种新的取向关系。这3种新的取向关系的来源及对力学性能的影响值得深入研究。
The effect of proton irradiation on the microstructure of reactor pressure vessel steel A508-3 was studied by transmission electron microscopy. Based on the composite diffraction pattern of ferrite and cementite, matrix analysis was used to study the effect of proton irradiation before and after the test The orientation relationship between ferrite and cementite. The results show that there is no obvious change in the ferrite lath width, carbide size, volume fraction and distribution before and after irradiation. A508-3 steel produced a uniform distribution of dislocation loops when irradiated to 0.271 dpa. The average diameter of dislocation loops was about 4.6 nm and the number density was about 2.7 × 1022m-3. In unirradiated samples, the orientation relationship between ferrite and cementite was found to be in accordance with the Bagaryatskii relationship. In the irradiated samples of 0.216 dpa and 0.271 dpa, three new types of ferrite and cementite were observed Orientation relationship. The origin of the three new types of orientation and the impact on the mechanical properties deserve further study.