前箱熔体温度对8011铝合金铸轧板坯组织性能的影响

Effect of front box melt temperature on microstructure and properties of 8011 aluminum alloy cast-rolling plate blank

为了稳定提高双零铝箔用铸轧坯料质量,使用电解铝液配料生产规格为7.0 mm×1300 mm的8011铝合金铸轧铝板卷,并利用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)及电子万能拉伸试验机等手段,研究了不同前箱铝熔体温度(680,690,700,710℃)对8011铝合铸轧板坯微观组织和力学性能的影响.结果表明:随着前箱熔体温度的升高,铸轧板坯晶粒的尺寸呈略微增大再急剧变大的趋势,其抗拉强度和断后伸长率均呈先缓慢降低后急剧下降的趋势;当前箱熔体温度控制在680~700℃时,可获得综合力学性能较佳的铸轧板坯,其平均纵向抗拉强度和横向抗拉强度分别不低于141.87 MPa和138.84 MPa,平均纵向断后伸长率和横向断后伸长率分别不低于29.8%和26.4%.

In order to steadily improve the quality of cast-rolling plate blank for double zero aluminum foil,8011 aluminum alloy cast-rolling plate blank with 7.0 mm×1300 mm was produced by directly using electrolytic aluminum liquid.The effects of different front box aluminum melt temperatures(680,690,700,710℃)on the microstructure and mechanical properties of 8011 aluminum alloy cast-rolling plate blank were studied optical microscope(OM),scanning electron microscope(SEM)and electronic universal tensile testing machine.The results show that the melt temperature of the front box,the grain size of the cast-rolling plate blank increase and then grows rapidly.The tensile strength and elongation after fracture both decrease slowly at first and then sharply.When the current box melt temperature is controlled at 680~700℃,the cast-rolling plate blank with better comprehensive mechanical properties can be obtained,its average longitudinal tensile strength and transverse tensile strength are not less than 141.87 MPa and 138.84 MPa,the average elongation after longitudinal fracture and transverse fracture is not less than 29.8%and 26.4%.