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.
所属栏目
材料性能及其应用“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
2008/4/82008/9/7
作者单位
涂益友: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
蔡磊:法尔胜集团公司, 江苏 江阴 214433
蒋建清: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
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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