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以二辊铸轧7050铝合金板材为研究对象,系统研究了二次轧制温度和变形量对7050铝合金铸轧板微观组织和力学性能的影响。结果表明,原始板材厚4mm,当轧制变形量为15%时,合金中大部分晶粒还保持铸轧态的等轴晶形状;当变形量为60%时,试样中的晶粒变小,铸轧组织大部分消失,晶粒沿轧制方向明显被拉长;当变形量为75%时,铸轧组织完全消失,晶粒破碎,拉长流线清晰。轧制温度升至450℃时,流变性最好,且在轧制过程中更容易发生再结晶,再结晶晶粒明显增多,板材力学性能最好,其抗拉强度为310.2 MPa,伸长率为3.77%。
The effect of secondary rolling temperature and deformation on the microstructure and mechanical properties of 7050 aluminum alloy cast-rolled plate was investigated by two-roll cast 7050 aluminum alloy plate. The results show that the original plate thickness is 4mm, when the rolling deformation is 15%, most of the grains in the alloy also maintain the equiaxed shape of the as-cast state. When the deformation amount is 60% Small, most of the cast-rolling organization disappeared, the grain along the rolling direction was obviously elongated; when the deformation is 75%, the casting and rolling organization completely disappeared, the grain broken, elongated streamline clear. When the rolling temperature was raised to 450 ℃, the rheological properties were the best, and the recrystallization occurred more easily during the rolling process. The recrystallized grains obviously increased, the mechanical properties of the sheet were the best, the tensile strength was 310.2 MPa, the elongation 3.77%.