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
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.
大应变量变形
显微组织
力学性能
cold-drawn steel wire
large deformation
microstructure
mechanical property
Abstract
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 Landford.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.
中图分类号 TG115.5 TG156.2
所属栏目 材料性能及其应用
基金项目 “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)
收稿日期 2008/4/8
修改稿日期 2008/9/7
网络出版日期
作者单位点击查看
备注涂益友(1978-),男,浙江遂昌人,讲师,博士.
引用该论文: TU Yi-you,CAI Lei,JIANG Jian-qing. Microstructure and Mechanical Properties of Pearlite Steel Wire with Large Deformation[J]. Materials for mechancial engineering, 2009, 33(5): 48～51
涂益友,蔡磊,蒋建清. 大应变量变形珠光体钢丝的显微组织和力学性能[J]. 机械工程材料, 2009, 33(5): 48～51
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【2】TASHIRO H.Piano wire of the highest tensile strength steel[J].Materia Japan,1996,35(11):1177-1181.
【3】俞德宗.全钢子午线轮胎用钢丝帘线的生产现状及发展趋势[J].轮胎工业,2002,22(10):579-581.
【4】LANGFORD G.A study of the deformation of patented steel wire[J].Metallurgical Transactions,1970,1(2):465-477.
【5】LANGFORD G.Deformation of pearlite[J].Metallurgical Transactions A,1977(6):861-875.
【6】MOVCHAN B A,LEMKEY F D.Mechanical properties of fine-crystalline two-phase materials[J].Materials Science and Engineering A,1997,224:136-145.
【7】HONG S I,HILL M A.Mechanical stability and electrical conductivity of Cu-Ag filamentary microcomposites[J].Materials Science and Engineering A,1999,264:151-158.
【8】HONG S I,HILL M A.Microstructural stability and mechanical response of Cu-Ag microcomposite wires[J].Acta mater,1998,46(12):4111-4122.
【9】SNOECK E,LECOUTURIER F,THILLY L,et al.Microstructural studies of in situ produced filamentary CuNb wires[J].Scripta Materialia,1998,38(11):1643-1648.
【10】BAKER S P.Plastic deformation and strength of materials in small dimensions[J].Materials Science and Engineering A,2001,319:16-23.
【11】MONTHEILLET F,GILORMINI P.Predicting the mechanical behavior of two-phase materials with cellular auto-mata[J].International Journal of Plasticity,1996,12(4):561-574.
【12】MISRA A,VERDIER M,LU Y C,et al.Structure and mechanical properties of Cu-X (X=Nb,Cr,Ni) nanolayered composites[J].Scripta Materialia,1998,39:555-560.
【13】SIENIAWSKI J,FILIP R,ZIAJA W.The effect of microstructure on the mechanical properties of two-phase titanium alloys[J].Materials and Design,1997,18:361-363.
【14】EMBURY J D,SINCLAIR C W.The mechanical properties of fine-scale two-phase materials[J].Materials Science and Engineering A,2001,319/321:37-45.
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