【作者】 钱宝华；

【导师】 黄光杰；

【作者基本信息】 重庆大学 ， 材料加工工程， 2008， 硕士

【摘要】 本论文以热粗轧工艺制度的Gleeble-1500D试验机模拟、不同热精轧终轧温度的轧制工艺实验和冷轧与退火工艺实验为基础,采用相同部位取样的方法进行拉伸力学性能测试与维氏硬度的测定,同时通过析出相的光学显微组织观察并结合偏光组织与扫描电镜、透射电镜观察以及差热分析、电导率测试等综合分析手段,研究了不同加工工艺对5052铝合金板材组织与性能的影响。结果表明,合金热粗轧工艺模拟过程中的基本动态软化机制为动态回复型软化,变形温度足够高时可以诱发几何型动态再结晶软化过程,而其道次间隙时间内的主要软化机制则为静态再结晶软化;提高热终轧温度将显著促进合金热连轧板材的再结晶过程,从而可以取消冷轧过程的中间退火工艺;不同加工状态下合金板材的应变硬化指数随着应变量的增大呈先增加后减小的变化趋势。更多还原

【Abstract】 In order to investigate the effect of processing technics on microstructure and properties for 5052 aluminum alloy, technology schedule experiments including Gleeble-1500D thermal- mechanical simulation for breakdown hot rolling (rough rolling) process, multistand hot rolling (finish rolling) processing at different finishing temperature as well as cold rolling and annealing experiments have been carried out. Furthermore, mechanical properties and electrical conductivity were investigated by means of Vickers hardness, tensile test and conductivity measurement. The effects of processing technology on microstructure and precipitation behavior were studied by optical microscopy (OM), polarized optical microscopy (POM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The results show that dynamic recovery is the basic softening mechanism during isothermal compression and geometric dynamic recrystallization (GDRX) is induced at elevated temperature condition. The softening in delay time is due to static recrystallization (SRX).The recrystallization progress is accelerated obviously when the finishing temperature is increased and intermediate annealing can be cancelled. Strain hardening exponent is increasing first and then decreasing with the increasing of strain under different processing states.更多还原