大应变冷拔钢丝的微观组织与磁学性能  

Microstructure and magnetics property of Cold-drawing Steel Wire Under Large Strain

作　　者：涂益友[1] 蒋建清[1] 蔡磊 

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,南京211189 [2]法尔胜集团公司,江阴214433

出　　处：《理化检验（物理分册）》2009年第2期71-73,100,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

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

摘　　要：采用扫描电镜观察了拉拔变形前后SWRH72A钢丝的显微组织,并采用振动样品磁强计测量了钢丝磁学性能随应变量增大的变化趋势。试验结果表明:拉拔变形后,钢丝横截面上平直的珠光体片层变得扭曲弯折,纵截面上呈纤维状组织。随着应变量的增大,微缺陷密度升高,钢丝矫顽力Hc和剩余磁化强度Mr都随之变大。当应变量较小时,钢丝比饱和磁化强度基本不变,为2.885 69×104A.m-1。当应变量增大到2.60时,样品的比饱和磁化强度升高到2.956 33×104A.m-1,计算得知钢丝中渗碳体含量由未变形状态的10.8%降至8.6%。The microstructure of SWRH72A steel wire under cold-drawn deformation were studied with SEM. The changes in magnetic properties of steel wire with increasing drawing strain were investigated using VSM. The results showed that originally straight pearlite plates become wavy after drawing at cross-section. Highly elongated pearlite colonies develops as a result of their stretching and rotation towards the wire axis. The coercivity and residual magnetization of steel wire increase with increasing drawing strain. The saturation magnetization of steel wire was almost unchanged, 2. 885 69 ×10^4A·m^-1. And it increased to 2. 956 33×10^4A·m^-1 with the strain extending to 2. 60. Cementite content of SWRH72A steel wire by calcutation was lowered from 10. 8% in undeform to 8.6%.

关 键 词：冷拔钢丝 大应变 振动样品磁强计 磁学性能 

分 类 号：TG115.50[金属学及工艺—物理冶金] TG156.2[金属学及工艺—金属学]