2A14铝合金锻件的热处理工艺  

Heat treatment of 2A14 aluminium alloy forgings

作　　者：刘春燕[1] 周丹晨[1] 李昌安[1] 江学强[1] 

机构地区：[1]中国工程物理研究院机械制造工艺研究所,四川绵阳621900

出　　处：《金属热处理》2011年第9期42-45,共4页Heat Treatment of Metals

摘　　要：针对生产中2A14铝合金锻件伸长率偏低,研究了锻造及热处理工艺对工件力学性能的影响。结果表明,锻造选用的坯料直径及时效工艺是影响锻件性能稳定性的主要因素。减小坯料直径能显著提高锻件的力学性能,尤其是伸长率能提高约1～2倍;锻件的伸长率对时效工艺参数很敏感。最佳时效时间为4.5～5 h,超过5 h以后,伸长率会快速降低;最佳时效温度为(152±2)℃,尽管强度降低约13%,但150℃时效的伸长率是155℃的1.2～2倍。优化出的最佳热处理工艺参数为380℃退火+502℃×2 h固溶,35～40℃热水中冷却+152℃×5 h时效。将该工艺应用于生产,产品伸长率提高约2～3倍,强度、硬度仍满足产品技术要求。According to low elongation of 2A14 aluminium alloy forgings in production,the effects of forging and heat treatment process on properties were studied.The results show that diameter of raw material and ageing process are the main factors that influence the forgings＇ property stability.The mechanical properties increase with decreasing the diameter of raw material,especially the elongation increases about 100%-200%.The elongation is very sensitive to the aging parameters.The optimal ageing time is 4.5-5 h.When the ageing time exceeds 5 h,the elongation decreases quickly.The optimal aging temperature is（152±2）℃.Although its strength decreases about 13%,the elongation of the forgings aging at 150 ℃ is 1.2-2 times as that of aging at 155 ℃.The optimum heat treatment parameters is annealing at 380 ℃,solution at 502 ℃ for 2 h,cooling in 35-40 ℃ water,and aging at 152 ℃ for 5 h.Treated with the optimum parameters,the forgings＇ elongation increases about 200%-300%,while the strength and hardness still satisfy the technical requirement.

关 键 词：2A14铝合金 锻造 热处理 力学性能 

分 类 号：TG166.3[金属学及工艺—热处理]