摘要镀锌钢丝广泛用于建筑、桥梁等行业中，尤其是桥梁行业。提高镀锌钢丝的强度成了目前关注的焦点。在目前的镀锌钢丝生产流程中即多道次拉拔与热镀锌工序之间增加适当热处理的工序，可以使镀锌钢丝的强度提高。与直接镀锌的钢丝相比，经过热处理再镀锌的钢丝抗拉强度可以平均提高50MPa，其中个别钢丝可以提高80MPa。对冷拔钢丝、热处理之后镀锌钢丝、直接镀锌钢丝的显微组织、物相进行分析，发现在热处理过程中，渗碳体内位错得到一定的回复，热稳定性提高，使热处理之后的钢丝在镀锌时抵抗球化的能力也就提高。另外，钢丝镀锌之后扭转性能下降并不是由于镀锌过程中珠光体组织发生球化。事实上，球状珠光体钢丝扭转性能明显优于片层状珠光体钢丝。25396
关键词 镀锌钢丝 热处理时效 珠光体球化 扭转性能
毕业论文设计说明书外文摘要
Title Study on the micro-structure and properties of 2000MPa grade zinc wire
Abstract
Galvanized steel wires are widely used in construction, bridges and other industries, especially the bridge industry. Increasing the intensity of galvanized steel wires is the focus .In the galvanized steel wire production process, adding a proper heat treatment process between the multi pass drawing and hot dip galvanizing process can improve the strength of galvanized steel wire.Compared with the steel wire directly galvanized, the tensile strength of the steel wire can be increased by an average of 50MPa, and the inpidual wire can be improved by 80MPa.The micro-structure and phase of cold drawn steel wire, heat treatment micro-structure of galvanized steel wire, galvanized steel wire are analyzed. It was found that in the process of heat treatment, carburizing dislocation get a reply and the thermal stability is improved , heat treatment of steel wire galvanized resistance spheroidizing ability also increases, the tensile strength increases as a result.In addition, the torsional performance of the steel wire after galvanizing is not due to the pearlite microstructure in the process of galvanizing.. In fact, the torsion of spherical pearlite steel wire is obviously better than that of lamellar pearlite steel wire.
Keywords Galvanized steel wire Heat treatment aging Nodular pearlite
Torsion performance
目 次
1 引言 1
1.1镀锌钢丝生产简介 1
1.1.1表面预处理 1
1.1.2多道次拉拔 2
1.1.3热镀锌 2
1.2 提高镀锌钢丝强度的研究现状 2
1.2.1提高原始盘条的强度 2
1.2.2提高盘条总压缩率 3
1.2.3 降低钢丝热镀锌时的强度损失 3
1.3本课题研究意义及内容 4
1.3.1研究意义 4
1.3.2研究内容 4
2 试验方法与设备 5
2.1 试验方案 5
2.2 试验方法及设备 5
2.2.1 拉伸试验 5
2.2.2 光学显微镜组织观察 5
2.2.3 SEM组织观察 6
2.2.4 XRD 物相观察 6
2.2.5 扭转实验 6
3 钢丝镀锌前后组织与性能研究 7
3.1 镀锌前后力学性能变化 7 2000MPa级镀锌钢丝的组织与性能研究:http://www.751com.cn/cailiao/lunwen_19164.html