6201铝合金导线制备新工艺研究
发布时间：2018-08-31 14:40
【摘要】：铝-镁-硅合金是一种可形变热处理铝合金,具有较高的强度与导电性能组合,被广泛用作铝合金架空导线。本文针对铝-镁-硅合金线杆连铸连轧工艺过程中实现在线固溶处理难以控制的生产现状,结合水平连铸、连续挤压工艺特点,提出一种6201铝合金导线制备新工艺,包括水平连铸、连续挤压、拉拔和人工时效。通过在Gleeble-3500热模拟机上的热压缩变形实验,研究了水平连铸6201铝合金金高温压缩变形行为,确定其较佳的热加工参数范围;同时,利用光学显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、室温拉伸试验、显微硬度和导电性能测试等手段,对该工艺所制备的铝合金力学性能和组织演变规律进行了研究。主要结果如下:(1)水平连铸6201铝合金在变形温度为350-500℃,应变速率为0.01-10s-1压缩变形时,其流变应力随着变形温度升高或应变速率减小而减小。可以采用包括Zener-Hollomon参数的Arrhenius双曲正弦关系描述合金的流变应力行为,其变形激活能Q=188.6k J/mol。(2)基于材料动态模型,建立了水平连铸6201铝合金的热加工图,其最优热加工参数范围是:变形温度420-480℃和应变速率3.5-10s-1。(3)水平连铸6201铝合金横截面、纵截面的组织在晶粒大小、晶粒形貌、晶体取向分布方面不同,连续挤压改变了合金原始组织的晶体取向分布和细化晶粒。(4)水平连铸-连续挤压可有效地实现6201铝合金中Mg2Si相的在线充分固溶处理。(5)采用该新工艺制备的6201铝合金导线的抗拉强度、延伸率和电导率分别为334.7MPa、6.0%和55.7%IACS,其力学与导电性能均可达到或超过传统工艺制备导线的性能。
[Abstract]:Al-Mg-Si alloy is a kind of thermomechanical alloy, which has high strength and conductivity, and is widely used as aluminum alloy overhead conductor. In this paper, according to the current production situation that the on-line solution treatment is difficult to control in the process of continuous casting and rolling of Al-MgO-Si alloy wire rod, a new process for preparing 6201 aluminum alloy conductor is put forward combining with the characteristics of horizontal continuous casting and continuous extrusion. Includes horizontal continuous casting, continuous extrusion, drawing and artificial aging. The hot compression deformation behavior of 6201 aluminum alloy in horizontal continuous casting at high temperature was studied by means of the hot compression deformation experiment on Gleeble-3500 thermal simulator, and the better range of hot working parameters was determined. The mechanical properties and microstructure evolution of aluminum alloy prepared by (OM), scanning electron microscope (OM), (SEM), transmission electron microscope (SEM), tensile test at room temperature, microhardness and electrical conductivity were studied. The main results are as follows: (1) when the deformation temperature is 350-500 鈩，
本文编号：2215295
[Abstract]:Al-Mg-Si alloy is a kind of thermomechanical alloy, which has high strength and conductivity, and is widely used as aluminum alloy overhead conductor. In this paper, according to the current production situation that the on-line solution treatment is difficult to control in the process of continuous casting and rolling of Al-MgO-Si alloy wire rod, a new process for preparing 6201 aluminum alloy conductor is put forward combining with the characteristics of horizontal continuous casting and continuous extrusion. Includes horizontal continuous casting, continuous extrusion, drawing and artificial aging. The hot compression deformation behavior of 6201 aluminum alloy in horizontal continuous casting at high temperature was studied by means of the hot compression deformation experiment on Gleeble-3500 thermal simulator, and the better range of hot working parameters was determined. The mechanical properties and microstructure evolution of aluminum alloy prepared by (OM), scanning electron microscope (OM), (SEM), transmission electron microscope (SEM), tensile test at room temperature, microhardness and electrical conductivity were studied. The main results are as follows: (1) when the deformation temperature is 350-500 鈩，
本文编号：2215295
本文链接：https://www.wllwen.com/kejilunwen/dianlilw/2215295.html
