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70 75铝合金可通过淬火时效获得高强度 ,但它在淬火过程中会产生淬火残余应力。本文对 70 75铝合金厚板在不同淬火水温下 ,以及某一水温下淬火后经不同预拉伸量和不同时效工艺制度下淬火残余应力大小及变化规律进行了测试与分析。结果表明 ,随着淬火水温的升高 ,残余应力明显降低 ;水淬后随着预拉伸量的增加 ,残余应力逐渐从压应力转变为拉应力 ,当预拉伸量约 2 %时 ,残余应力基本上趋近于零 ;随着时效温度升高和时效时间延长 ,残余应力呈下降趋势。因此 ,合理的淬火水温、预拉伸量以及时效制度是降低 70 75铝合金厚板淬火残余应力的有效工艺措施。其中尤以适当的淬火水温和预拉伸量最为有效
70 75 Aluminum alloy can be obtained by quenching aging high strength, but it will produce during quenching quenching residual stress. In this paper, 70 75 aluminum alloy plate at different quenching water temperature, as well as a water temperature quenching after different pre-stretch and aging process under different quenching residual stress size and variation were tested and analyzed. The results show that the residual stress decreases obviously with the increase of quenching water temperature. The residual stress gradually changes from compressive stress to tensile stress with the increase of pre-tension after water quenching. When the pre-stretch is about 2% The stress basically approaches zero; as the aging temperature increases and the aging time prolongs, the residual stress shows a downward trend. Therefore, a reasonable quenching water temperature, pre-stretch and aging system is to reduce the 70 75 aluminum alloy plate quenching residual stress effective process measures. Among them, the most appropriate quenching water temperature and pre-stretch are the most effective