中间退火对冷轧5056铝合金薄板组织和性能的影响

Effect of intermediate annealing on the microstructure and properties of cold rolled 5056 aluminum alloy sheet

针对5056铝合金开展冷轧中间退火工艺优化研究,采用光学显微镜、扫描电镜(SEM)、X射线衍射仪、硬度计等检测设备和拉伸、压缩等试验方法,分析了退火温度对冷轧5056铝合金薄板组织和性能的影响。结果表明:采用60%~80%变形量冷轧的5056铝合金薄板,因形变强化而塑性较低,分别在250℃、350℃、400℃、450℃和500℃进行中间退火处理,延伸率随退火温度逐渐升高,而强度和硬度呈下降趋势。当退火温度高于350℃时,5056铝合金板的强度和延伸率随退火温度升高而产生的变化不显著,但加工硬化率存在显著差异,其中450℃退火温度下5056铝合金板的加工硬化率减小了65%。

The intermediate annealing process of cold rolling 5056 aluminum alloy was studied in this paper.The effects of annealing temperature on the microstructure and properties of cold rolling 5056 aluminum alloy sheet were analyzed by means of optical mi⁃croscopy,scanning electron microscopy(SEM),X-ray diffraction,hardness,tensile and compression.The results show that the 5056 aluminum alloy sheet with 60%~80%deformation has low plasticity due to deformation strengthening,and the intermediate annealing treatment at 250℃,350℃,400℃,450℃and 500℃respectively,the elongation increases gradually with the annealing tempera⁃ture,while the strength and hardness decrease.When the annealing temperature is higher than 350℃,the strength and elongation of 5056 aluminum alloy sheet do not change significantly with the increase of annealing temperature,but the work hardening rate has a significant difference,and the work hardening rate of 5056 aluminum alloy plate decreases by 65%at 450℃annealing temperature.