退火处理对大应变冷拔珠光体钢丝性能和微观组织的影响  

Effect of Annealing Treatment on Microstructure and Properties of Severe Plastic Deformation Cold Drawn Pearlitic Steel Wire

作　　者：涂益友[1] 蒋建清[1] 蔡磊[2] 

机构地区：[1]东南大学材料科学与工程学院,江苏省先进金属材料高技术研究重点实验室,南京211189 [2]江苏法尔胜集团公司,江阴214433

出　　处：《材料导报》2009年第4期26-28,共3页Materials Reports

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TEM观察了大应变冷拔SWRH72A钢丝经不同温度退火处理后的微观组织,并采用振动样品磁强计测量了钢丝磁学性能的变化。试验结果表明,大应变冷拔变形引起SWRH72A钢丝中渗碳体分解,部分碳原子溶入铁素体形成过饱和铁素体。变形后钢丝经200～300℃退火,由于渗碳体颗粒的弥散析出,钢丝强度升高到2400MPa。退火温度进一步升高到400℃,渗碳体片开始球化,钢丝强度大幅降低,但塑性显著增加。The microstructure changes of SWRH72A steel wire under severe plastic deformation during annea-ling are investigated by TEM. The changes in magnetic properties of steel wire are studied using VSM. The results illustrate that severe plastic deformation cause cementite decomposition and dissolution of partial carbon atoms into ferrite Cementites precipitate which distribute dispersedly in matrix when the annealing temperature reaches 200 300℃, resulting in increasing the strength of wire up to 2400MPa. When the annealing temperature reaches 400℃ ,the strength of wire is decreased sharply, but the plasticity is enhanced observably.

关 键 词：珠光体钢丝 大应变变形 渗碳体分解 退火 磁学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—合金]