本文選題：銅包鋼復(fù)合線 + 力學(xué)性能�。� 參考：《江西理工大學(xué)》2016年碩士論文

【摘要】：高速鐵路是現(xiàn)代社會發(fā)展中的新型運輸模式,它的興起迎合了當(dāng)前世界各國交通發(fā)展的需要,并發(fā)展十分迅速。高鐵接觸線作為高鐵中最重要的部分,其質(zhì)量好壞決定了高鐵運行的穩(wěn)定性及安全性。銅包鋼復(fù)合線具有良好導(dǎo)電性、高強度、耐腐蝕、壽命長等優(yōu)點,在接觸線領(lǐng)域有很大的應(yīng)用前景。本文通過拉伸復(fù)合法及水平連鑄法制備銅包鋼線,對其進(jìn)行冷變形及退火處理,分析了復(fù)合線的橫、縱截面金相組織變化、擴散層厚度、界面結(jié)合強度、銅-鋼界面顯微硬度、抗拉強度、延伸率和導(dǎo)電率。探索了拉拔變形工藝、退火工藝對其組織及性能的影響規(guī)律。自主設(shè)計開發(fā)了水平連鑄銅包鋼線坯裝置,該裝置可連續(xù)制備出Φ12mm銅包鋼線坯,其界面擴散層厚度為2.5μm,界面結(jié)合強度為29.5MPa。此外,采用拉伸復(fù)合法制得Φ7mm銅包鋼線坯。對銅包鋼線進(jìn)行冷拉變形,隨變形量的增大,拉拔變形后Cu、Fe的橫截面組織均呈現(xiàn)晶界模糊,縱截面組織均呈現(xiàn)纖維狀。在退火過程中,隨退火溫度的升高及時間的增加,Cu、Fe橫、縱截面晶粒增大。相比退火時間,退火溫度對組織的影響更明顯。拉拔變形中隨拉拔變形量的增大,銅包鋼復(fù)合線的導(dǎo)電率、延伸率降低,抗拉強度升高。隨退火溫度的提高及時間的增加,延伸率升高,抗拉強度降低。導(dǎo)電率隨退火時間的延長而升高,隨溫度的升高先上升后下降。隨變形量的增大,銅、鋼的顯微硬度增大。退火后銅、鋼的顯微硬度顯著下降,隨退火溫度的升高及退火時間的延長,距離界面同一位置處銅、鋼的顯微硬度逐漸下降。隨退火溫度升高和退火時間的增加,擴散層厚度變厚,界面結(jié)合強度增加。到達(dá)Fe的再結(jié)晶溫度后,溫度再升高、時間再增加,擴散層厚度、界面結(jié)合強度基本保持不變。綜合考慮其擴散層及界面結(jié)合情況,得到最佳退火工藝為750℃退火2 h。
[Abstract]:High-speed railway is a new mode of transportation in the development of modern society. High-speed contact line is the most important part of high-speed rail, its quality determines the stability and safety of high-speed rail operation. Copper clad steel composite wire has many advantages, such as good electrical conductivity, high strength, corrosion resistance, long life and so on, so it has great application prospect in the field of contact wire. In this paper, copper clad steel wire was prepared by tensile composite method and horizontal continuous casting method. The microstructure changes of transverse and longitudinal sections, diffusion layer thickness, interface bonding strength and microhardness of copper steel interface were analyzed. Tensile strength, elongation and conductivity. The influence of drawing deformation process and annealing process on the microstructure and properties were investigated. A horizontal continuous casting copper clad steel wire billet device has been designed and developed. The 桅 12mm copper clad steel wire billet can be continuously prepared by this device. The thickness of the interface diffusion layer is 2.5 渭 m and the interface bonding strength is 29.5 MPA. In addition, 桅 7mm copper clad steel wire billet was obtained by tensile compound method. The cold tensile deformation of copper clad steel wire shows that the grain boundary is blurred and the structure of longitudinal section is fibrous after drawing deformation. During annealing, the grain size of the longitudinal section increases with the increase of annealing temperature and time. Compared with annealing time, the effect of annealing temperature on microstructure is more obvious. The electrical conductivity, elongation and tensile strength of copper clad steel composite wire decrease with the increase of drawing deformation. With the increase of annealing temperature and time, the elongation increases and the tensile strength decreases. The conductivity increases with the increase of annealing time, and then decreases with the increase of temperature. The microhardness of copper and steel increases with the increase of deformation. After annealing, the microhardness of copper and steel decreased significantly. With the increase of annealing temperature and the prolongation of annealing time, the microhardness of steel decreased gradually at the same location from the interface. With the increase of annealing temperature and annealing time, the thickness of the diffusion layer becomes thicker and the interfacial bonding strength increases. After reaching the recrystallization temperature of Fe, the temperature rises again, the time increases again, the thickness of diffusion layer and the interfacial bonding strength remain unchanged. Considering the bonding of diffusion layer and interface, the optimum annealing process was obtained at 750 鈩，

本文編號：1847131