大应变量变形珠光体钢丝的显微组织和力学性能  

Microstructure and Mechanical Properties of Pearlite Steel Wire with Large Deformation

作　　者：涂益友[1] 蔡磊 蒋建清[1] 

机构地区：[1]东南大学江苏省先进金属材料高技术研究重点实验室,江苏南京211189 [2]法尔胜集团公司,江苏江阴214433

出　　处：《机械工程材料》2009年第5期48-51,共4页Materials For Mechanical Engineering

基　　金："973"前期研究专项资助项目(2007CB616900);国家科技支撑计划资助项目(2007BAE15B05);新世纪优秀人才支持计划资助项目(SCET-04-11471)

摘　　要：采用透射电镜观察了大应变量拉拔变形前后SWRH72A钢丝的显微组织,研究了钢丝的力学性能及珠光体片层间距随应变量的变化关系。结果表明:钢丝的抗拉强度和屈服强度均随着应变量的增大而增大,伸长率则随着应变量的增大先急剧下降,而后基本保持不变;钢丝显微组织中的珠光体片层间距随着应变量增大逐渐减小,基本上符合Langford的指数衰减规律,经过ε=2.6的冷拔变形后,珠光体片层间距由变形前的200 nm减小到50 nm左右;经过大应变量拉拔变形后,铁素体内的位错密度显著升高,形成大量的位错胞,变形后铁素体具有特殊取向。The microstructure of SWRH72A steel wire before and after large drawing deformation was analyzed by TEM. Changes of the pearlite interlamellar spacing and mechanical properties with the drawing strain were studied. The results indicate that with the increase of strain, the strength of the steel wire increased, but elongation first decreased sharply and then remained unchanged. The pearlite interlamellar spacing of the steel wire decreased with the increase of strain, and it changed from 200 nm to 50 nm when the drawing strain ε=2.6, which was basically followed exponential decay law of Landlord. The dislocation density in ferrite lamellar significantly increased after large deformation, formed a lot of dislocation cells, and the ferrite changed into a special orientation.

关 键 词：冷拔钢丝 大应变量变形 显微组织 力学性能 

分 类 号：TG115.5[金属学及工艺—物理冶金] TG156.2[金属学及工艺—金属学]