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    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.
    引用本文: 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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    TU Yi-you, CAI Lei, JIANG Jian-qing. Microstructure and Mechanical Properties of Pearlite Steel Wire with Large Deformation[J]. Materials and Mechanical Engineering, 2009, 33(5): 48-51.
    Citation: TU Yi-you, CAI Lei, JIANG Jian-qing. Microstructure and Mechanical Properties of Pearlite Steel Wire with Large Deformation[J]. Materials and Mechanical Engineering, 2009, 33(5): 48-51.
    shu

    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
    • 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.

       

      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.

       

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