Abstract

In this paper, the microstructure, texture and mechanical properties of pearlite steel wires produced using different processes were investigated by mechanical testing and electron microscopy techniques including combining SEM, TEM and XRD to reveal the evolution of the microstructure and properties of 2000 MPa bridge cable steel. The experiments were carried out under industrial conditions. The microstructural observations indicate that the orientation of the lamellar pearlite in the steel rod is random and that patenting produces a fully pearlitic microstructure with a fine pearlitic interlamellar spacing. The pearlitic lamellae of the wires tilt and stretch toward the drawing direction during cold drawing. Although the cementite of the cold drawn wires retains a laminar shape, partial fragmentation of the cementite lamella occurs. A large number of SBs appear in the galvanized steel wire, and fragmentation of the cementite lamella is more obvious. After cold drawing, the orientation of the 〈110〉 texture intensifies and becomes dominant. However, the intensity of the 〈110〉 texture decreases slightly after galvanizing. The results from the mechanical experiments show that the hardness and tensile strength of the steel wires increase rapidly after cold drawing before reaching a peak. However, the hardness and tensile strength of the galvanized steel wire decrease slightly.

中文翻译：

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2000 MPA桥梁电缆钢组织和性能的演变。

摘要

本文通过机械测试和电子显微镜技术研究了不同工艺生产的珠光体钢丝的显微组织，织构和力学性能，包括结合SEM，TEM和XRD的电子显微镜技术，揭示了2000 MPa桥梁电缆钢的显微组织和性能演变。 。实验是在工业条件下进行的。显微组织观察表明，层状珠光体在钢棒中的取向是无规的，并且获得专利可产生具有良好珠光体层间间距的完全珠光体微结构。在冷拔过程中，线的珠光薄层向拉伸方向倾斜并拉伸。尽管冷拔丝的渗碳体保持层状，但渗碳体薄片会发生部分碎裂。镀锌钢丝中出现大量的SB，渗碳体薄片的碎裂更为明显。冷拔后，〈110〉织构的取向增强并占优势。但是，镀锌后，〈110〉织构的强度略有降低。力学实验的结果表明，钢丝的硬度和抗拉强度在冷拔后达到峰值之前迅速增加。但是，镀锌钢丝的硬度和抗拉强度略有下降。力学实验的结果表明，钢丝的硬度和抗拉强度在冷拔后达到峰值之前迅速增加。但是，镀锌钢丝的硬度和抗拉强度略有下降。力学实验的结果表明，钢丝的硬度和抗拉强度在冷拔后达到峰值之前迅速增加。但是，镀锌钢丝的硬度和抗拉强度略有下降。