淬火转移时间对1933铝合金拉伸性能、腐蚀性能及微观组织的影响

通过常温拉伸性能测试、晶间和剥落腐蚀试验、光学显微镜及透射电子显微镜研究淬火转移时间(5～90 s)对1933铝合金锻件拉伸性能、腐蚀性能及微观组织的影响.研究结果表明:随着淬火转移时间延长,合金的拉伸性能和耐腐蚀性能均降低；当转移时间增加至90 s时,抗拉强度下降7.5％,屈服强度下降9％,伸长率下降约20％,腐蚀深度增加400％.淬火转移时间过长导致晶粒内部析出粗大的平衡η相,降低了时效强化效果；晶界无沉淀析出带宽化,降低了伸长率和耐腐蚀性能.为获得良好的综合性能,转移时应使该合金产品淬火时的温度不低于约366℃.

Influence of quench transfer time on tensile properties,corrosion properties and microstructure of 1933 aluminum alloy

The influence of quench transfer time(5~90s) on the tensile properties,corrosion properties and microstructure of 1933 aluminum alloy forging was investigated by ambient tensile testing,intergranular and exfoliation corrosion exposure test,optical microscopy and transmission electron microscopy.The results show that the tensile properties and corrosion resistance decrease with the increase of quench transfer time.At 90 s,the drop percentages of ultimate strength,yield strength and elongation are about 7.5%,9% and 20%,respectively,and the corrosion depth increases by 400%.Prolonged transfer time results in coarse η equilibrium phase in the grains,which causes the strengthening effect decrease after aging,and wider precipitates free zone,which makes elongation and corrosion resistance decrease.In order to obtain high properties,the transfer time for the alloy products should be controlled to keep the temperature just before quenching no lower than about 366 ℃.