质子辐照A508-3钢显微组织和物相取向关系  

Microstructure and orientation relationship between different phases in the proton irradiated A508-3 steel

作　　者：丁辉[1] 雷静[1] 束国刚[1,2] 万强茂[1,3] 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072 [2]中广核工程有限公司,广东深圳518031 [3]苏州热工研究院有限公司,江苏苏州215004

出　　处：《材料热处理学报》2014年第2期51-56,共6页Transactions of Materials and Heat Treatment

基　　金：国家科技重大专项(2011ZX06004-002)

摘　　要：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。Influence of proton irradiation on microstrueture of A508-3 steel was investigated by transmission electron microscope. Based on the selected area electron diffraction patterns of ferrite and cementite, the orientation relationships between the ferrite and cementite were determined by the matrix analysis method. Results show that the width of lath ferrites and size of carbides don＇ t change in A508-3 steel under proton irradiation up to 0. 271 dpa, as well as the volume fraction and distribution of carbides. Dislocation loops distribute homogeneously in A508-3 steel at 0. 271 dpa. The average diameter of dislocation loops is 4.6 nm ,and number density is 2.7 x 1022 m-3 The orientation relationships between ferrite and eementite in the unirradiated A508-3 steel are consistent with the Bagaryatskii relationship. However, three new orientation relationships of ferrite and eementite are obtained in the irradiated A508-3 steels at 0. 216 dpa and 0. 271 dpa. The origin of the new relationships and its effect on mechanical properties are worth to explore in the future.

关 键 词：质子辐照 组织形态 矩阵分析法 取向关系 

分 类 号：TG113.1[金属学及工艺—物理冶金]