【摘要】 通过试验研究了均匀化热处理和人工时效处理对普通DC铸造和低频电磁铸造2024铝合金力学性能的影响。结果表明,随均匀化时间延长,两种试样均呈抗拉强度降低、伸长率增加的趋势。低频电磁铸锭伸长率的变化幅度大于普通DC铸锭。试验还进行了两种铸锭经轧制变形后的人工时效处理,普通DC铸造和低频电磁铸造的铝合金时效后的硬度都随时效时间延长,先升高、后降低,且低频电磁铸造2024铝合金时效后的硬度高于普通DC铸造2024铝合金。电磁铸造2024铝合金的硬度经过10h处理后达到峰值,普通DC铸造铝合金到达时效峰值的时间则有所滞后。更多还原

【Abstract】 The influences of heat treatment on the mechanical property of low frequency electromagnetic casting(LFEC)and direct chill(DC)casting 2024 aluminum alloy were investigated experimentally. The results show that with the increasing of homogenization time, the tensile strength of the ingots is decreased and the elongation is increased. Furthermore, the increase amplitude of elongation of LFEC ingot is higher than that of DC ingot. The artificial aging after rolling of the ingots has also been practiced. With the increasing of aging time, the hardness of the two kinds of ingots is increased at first and than decreased. In the same aging condition, the hardness of LFEC rolling plate is higher than that of DC rolling plate. Aging at 180 ℃, the rolling plate of LFEC ingot reaches its peak strength in 10 hours, which is faster than the rolling plate of DC ingot.更多还原