一种变形低碳锰硼钢中条带状亚结构的组织演化  

MICROSTRUCTURE EVOLUTION OF THE STRIP-LIKE SUBGRAINS IN DEFORMED 15MnB STEEL

作　　者：田素贵[1] 于宏[1] 张禄廷[1] 洪鹤[1] 徐永波[2] 胡壮麒[2] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110023 [2]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2003年第8期826-830,共5页Acta Metallurgica Sinica

基　　金：辽宁省教育厅基金资助项目 9718221112

摘　　要：利用透射电子显微镜观察冷拔缩径变形和退火后低碳锰硼钢的组织形貌,研究了该钢的变形特征及组织演化规律.结果表明:在变形带中,铁素体沿平行于剪切应力方向形成条带状亚晶, {110}晶面为变形条带状亚晶的滑移面,条带状亚晶内存在高密度位错;经退火处理后,条带状亚晶内的位错束集成与条带状亚晶界垂直的位错胞壁,形成类方形位错胞结构;进一步经位错胞壁的扩散迁移,形成各胞壁之间呈120°夹角的亚晶结构.Microstructures of 15MnB steel after cold drawing and annealing are observed by means of transmission electron microscopy in order to investigate the evolution regularity of the deformation microstructures. The results show that the subgrain structures of the ferrite-strip along the drawing direction are formed in the deformation bands of steel. The {110} crystal planes are the slip planes of ferrite subgrain-strip, and the dense dislocations exist in the subgrains. After annealing, the denser dislocations in the strip-like subgrains are assembled into square-like cell walls which are vertical to the original subgrain-strip boundaries. The subgrain structure of 120degrees between the cell walls is further formed by means of the diffusion migration of dislocation cell walls.

关 键 词：锰硼钢 冷变形 亚晶 位错 再结晶 

分 类 号：TG113.1[金属学及工艺—物理冶金]