锻造工艺对7A09铝合金锻件晶粒组织的影响  

Effect of Forging Process on Microstructure of 7A09 Aluminum Alloy

作　　者：黄映霞[1] 

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063

出　　处：《失效分析与预防》2012年第2期109-113,共5页Failure Analysis and Prevention

基　　金：国家自然科学基金(51005112);轻合金加工科学和技术国防重点学科实验室开放基金(GF200901008)

摘　　要：采用7A09铝合金过热处理工艺实验,研究其过热显微组织形态;采用4种锻造温度(440、460、480、500℃)对应3种变形程度ε(45%、68.3%、76.7%)进行了锻造实验,分析了锻造温度和变形程度对锻后晶粒组织的影响。过热处理工艺实验研究表明,随着加热温度的升高、保温时间的延长,晶粒变大;在加热温度440℃保温时间6 h后锻件的显微组织图上出现了织构组织,在加热温度500℃保温时间10 h后过烧现象明显;锻造工艺实验研究表明,获得锻后晶粒细小组织的最佳锻造工艺参数是锻造温度440℃和变形程度76.7%。The microstructure of 7A09 aluminum alloy during overheat experiments was studied. The experiments were carded out by forging at the four kinds of deformation temperature （440,460,480,500℃） for the three kinds of deformation degree （ε = 45% ,68.3% ,76.7% ） respectively to analyze the effect of forging temperature and deformation degree on the mierostructure. The result of overheat experiments shows that the grain size increases continuously with the increase of heating temperature and holding time. After 7A09 aluminum alloy was annealed at 440℃ for 6 h, recrystallization texture appeared; after annealed at 500 ℃ for 10 h, burning structure appeared. The deformation degree of 76.7% at 440 ℃ is the best processing parameter for gain refinement during forging.

关 键 词：7A09铝合金 锻造工艺 过热 变形程度 显微组织 

分 类 号：TG316[金属学及工艺—金属压力加工]