摘要
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。
The heat treatment of 7075 A1 alloy used for engine rocker arms was carried out, and the mi- crostructure,mechanical properties and stress corrosion resistance of 7075 A1 alloy at different aging con- ditions were investigated. The results show that after T6 treatment, the strength of A1 alloy reaches the maximum value while electrical conductivity exhibits low which takes bad stress corrosion resistance. After orthogonal optimization two-stage aging treatment, the strength of alloy is decreased slightly while electrical conductivity is increased obviously. The stress corrosion resistance is improved with the decrease of the time and cost for manufacture, improving the production efficiency. The optimized heat treatment process is （460℃×1h）＋（105℃×8h＋160℃×8h）
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2014年第7期754-756,共3页
Special Casting & Nonferrous Alloys
关键词
铝合金摇臂
热处理
抗应力腐蚀
Engine Rocker Arms, Heat Treatment, Stress Corrosion Resistance
