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通过对7075铝合金汽车发动机摇臂进行热处理工艺优化,并对3种时效状态下的7075铝合金汽车发动机摇臂的显微组织、力学性能及抗应力腐蚀性能进行了分析。结果表明,经过T6处理后,摇臂的强度达到了峰值,但电导率较低,即抗应力腐蚀性能较差;经过双级时效正交试验优化,合金强度稍有降低,电导率大幅提高,合金抗应力腐蚀性能得到改善的同时减少了生产时间及成本;该摇臂的最佳热处理制度为(460℃×1 h)固溶+(105℃×8 h+160℃×8 h)时效。
By optimizing the heat treatment process of the 7075 aluminum alloy engine rocker arm, the microstructure, mechanical properties and stress corrosion resistance of the 7075 aluminum alloy engine rocker arm under three aging conditions were analyzed. The results show that after T6 treatment, the strength of the rocker arm reaches the peak value, but the conductivity is low, that is, the stress corrosion resistance is poor. After two-stage aging orthogonal test, the alloy strength decreases slightly and the conductivity increases greatly. The corrosion resistance of the alloy is improved while the production time and cost are reduced. The optimal heat treatment system of the rocker arm is (460 ℃ × 1 h) solid solution + (105 ℃ × 8 h + 160 ℃ × 8 h) aging.