冷拔珠光体钢丝渗碳体微观结构  

Microstructure evolution of cementite in cold drawn pearlitic steel wires

作　　者：王燕[1] 方峰[1] 王雷[1] 蒋建清[1] 杨恒 

机构地区：[1]东南大学材料科学与工程学院,江苏南京211189 [2]法尔胜集团公司,江苏江阴214433

出　　处：《材料热处理学报》2010年第5期92-95,共4页Transactions of Materials and Heat Treatment

基　　金：国家"973"计划资助项目(2007CB616903);国家科技支撑计划(2007BAE51B09)

摘　　要：采用扫描电镜(SEM)、透射电镜(TEM)和高分辨透射电镜(HREM)观察了拉拔前后SWRH82B钢丝的显微组织,并采用振动样品磁强计(VSM)研究了渗碳体含量随应变量的变化规律。结果表明,钢丝经拉拔变形后,铁素体中形成竹节状位错亚结构;渗碳体片层内部碎化,并出现非晶。VSM测量显示,随着应变量的增加,钢丝比饱和磁化强度不断升高,渗碳体含量逐渐减少。变形前,钢丝的比饱和磁化强度为198.84 emu/g。经过应变量为1.90拉拔变形后,钢丝的比饱和磁化强度升高到210.9emu/g。相应的渗碳体含量则由变形前的14.1%降至变形后的8.9%。这表明SWRH82B钢丝经过应变量为1.90的拉拔后,渗碳体发生了部分溶解。The microstructure of SWRH82B steel wires before and after cold drawn deformation was studied by means of SEM,TEM and HREM. The changes of cementite volume fraction with increasing drawing strain were investigated using vibrating sample magnetometer （VSM）. The results show that bamboo-like dislocation substructure forms in lamellar ferrite, and fragment and amorphous structure are developed in lamellar cementite after cold drawn deformation. Specific saturation magnetization of the steel wire increases while the cementite volume fraction decreases with increasing drawing strain. The saturation magnetization is 198.84 emu/g of the steel wire before drawing,and it increases to 210. 9 emu/g for the steel wire after deformation with the strain of 1.90. The corresponding cementite volume fraction decreases from 14. 1% to 8.9% ,indicating that part of cementitc decomposes in SWRH82B steel wires cold drawn to ε = 1.90.

关 键 词：冷拉拔钢丝 渗碳体 饱和磁化强度 非晶 

分 类 号：TG142.21[一般工业技术—材料科学与工程]