退火温度对船用Al-Mg-Mn-Cr合金组织和性能的影响

通过力学性能测试、光学显微镜及腐蚀性能测试等手段,研究了不同退火温度对实际生产的5AN6铝合金板材组织和性能的影响。结果显示:合金在退火后力学性能持续下降,于280 ℃退火时强度发生大幅度下降;在300~360 ℃退火时,合金力学性能趋于稳定;原始状态合金的晶粒组织为不完全的纤维组织,在280 ℃退火之后晶粒明显细化,可认为合金在280 ℃退火后发生了再结晶;5AN6铝合金的腐蚀性能温度敏感区间为160~240 ℃,在此温度区间内显微组织显示为沿晶界连续析出的β相。

Effect of annealing temperature on microstructure and properties of marine Al-Mg-Mn-Cr alloy

Effect of different annealing temperature on the microstructure and properties of the actual pvoduction of 5AN6 aluminum alloy sheet was studied by means of mechanical properties test, optical microscope and corrosion property test. The results show that after annealing, the mechanical properties of the material continue to decline. After annealing at 280 ℃, the strength drops significantly. After annealing at 300-360 ℃, the mechanical properties tend to be stable. The grain structure in the original state is incomplete fiber structure, but the grain is obviously refined after annealing at 280 ℃. It can be considered that recrystallization occurs after annealing at 280 ℃. The temperature sensitive range of corrosion property of the 5AN6 alloy is 160-240 ℃, and the microstructure in this temperature range is continuous precipitation of β phase along the grain boundary.