AlSi7Mg合金半固态成形件的热处理工艺  

Heat Treatment for Semi-solid Thixoformed A356 Al Alloy Bush Cap

作　　者：王平[1] 路贵民[1] 崔建忠[1] 董维国[2] 

机构地区：[1]东北大学 [2]中华人民共和国教育部科技司

出　　处：《特种铸造及有色合金》2003年第5期18-19,共2页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目 (599740 0 9);国家"863"高技术研究发展计划资助项目 (2 0 0 2AA3370 1 0 );第 2 9批中国博士后科学基金资助项目;沈阳市科学基金资助项目 (2 0 0 1 2 2 8- 0 7- 1 3)

摘　　要：利用电阻炉加热 ,采用正交设计方法 ,优化了半固态A3 5 6铝合金触变成形件轴瓦盖的热处理工艺 ,并进行了硬度测试。结果表明 :半固态成形后的轴瓦盖T6处理的最佳工艺制度为固溶温度 5 3 5℃ ,固溶时间 10h ,时效温度 165℃ ,时效时间 5h。其硬度值 (HV)为 116.85MPa ,此时析出相分布均匀 ,组织细小。Heat treatment process for semi-solid thixoformed A356 alloy bush cap was optimized by orthogonal method under the condition of heating in resistance furnace. The microstructures and properties of the bush cap were examined. The results showed that optimum T6 treatment for semi-solid thixoformed bush cap is shown as follows: solid solution temperature 535 ℃ for 10h , ageing temperature 165 ℃ fo 5 h. Hardness of bush cap Hv 116.85. Meanwhile, precipitated phase is characterized by uniform distribution and fine microstructure. The existence of thixoformed zone results in strengthening effects to some extent. The properties of heat-treated thixoformed bush cap are superior to those in low-pressure casting and other semi-solid methods also.

关 键 词：半固态形成件 ALSI7MG合金 触变成形 固溶时效 硬度 正交设计 轴瓦盖 热处理 

分 类 号：TG166.3[金属学及工艺—热处理]