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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Chromium Additions upon Microstructure and Mechanical Properties of Cold Drawn Pearlitic Steel Wires
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Effects of Chromium Additions upon Microstructure and Mechanical Properties of Cold Drawn Pearlitic Steel Wires

机译：铬添加对冷珠钢丝微观结构和力学性能的影响

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摘要

Cr-containing pearlitic steel wires were prepared through cold drawing and simulated galvanization process. Effect of chromium microalloying on microstructural and mechanical properties of the steel wires was investigated. Experimental results show that size of pearlitic colonies of the steel rods decreased as Cr content increased from 0.2 to 0.6 wt.%; meanwhile, interlamellar spacing was little affected because of isothermal phase transition in salt bath. The tensile strength of the pearlitic steel rods was increased from 1480 to 1550 MPa. The tensile strength of the Cr-containing cold drawn wires (epsilon = 1.58) was increased about 33%, and the torsion circle of the wires were about 15 with cleavage fracture. After annealing at 450 A degrees C for 2 min, tensile strength of the wires increased, but torsion circle was decreased to less than 5. As the annealing time increased, the torsion circle of the steel wires with 0.2 wt.% Cr was improved to about 10 with cleavage fracture, while the torsion performance of the wires having high Cr contents remained low because of delamination fracture. The cementite platelets in Cr-containing wires turned into cementite crystal particles during cold drawing. Microstructure observation and thermal analysis have confirmed that thermal stability of cementite was enhanced with the increase of Cr content.
机译：通过冷拉伸和模拟镀锌过程制备含CR珠光体钢丝。研究了铬微合金化对钢丝微观结构和力学性能的影响。实验结果表明，随着Cr含量从0.2〜0.6重量增加，钢棒的珠菌菌落的尺寸降低。与此同时，由于盐浴中的等温相转变，层间间距很小。珠光体钢棒的拉伸强度从1480增加到1550MPa。含Cr的冷拔线（Epsilon = 1.58）的拉伸强度增加约33％，线的扭转圆圈约为15，裂解骨折。在450℃下退火2分钟后，导线的拉伸强度增加，但随着退火时间增加，扭转圆数降低至小于5.随着0.2重量％的钢丝的扭转圆圈。％Cr改善大约10次裂解骨折，而由于分层骨折，具有高Cr内容物的电线的扭转性能仍然低。在含CR线中的渗碳石血小板在冷拉伸期间转化为渗透石晶体颗粒。微观结构观察和热分析证实，随着Cr含量的增加，增强了渗碳岩的热稳定性。

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