2A12合金化铣样品表面粗晶形成机理研究  

Study on surface coarse grain deformation mechnism for 2A12 alloy chemical milling sample

作　　者：李政龙 冯旺 Li Zhenglong;Feng Wang(Southwest Aluminum(Group)Co.,Ltd.,Chongqing 401326,China)

机构地区：[1]西南铝业(集团)有限责任公司,重庆400050

出　　处：《铝加工》2021年第3期51-54,共4页Aluminium Fabrication

基　　金：重庆市技术创新与应用示范专项产业类重点研发项目(cstc2018jszx-cyzdX0094)。

摘　　要：2A12铝合金广泛应用于机身蒙皮等飞机结构件。拉伸成形(拉形)是蒙皮类零件成形的重要加工工艺,在拉形过程及后续处理中出现的表面缺陷将严重影响蒙皮的使用寿命。通过宏观观察、化学成分、显微组织分析等检测手段对化铣后表面出现的粗晶现象的2A12铝合金样品进行了综合分析,认为样品粗大晶粒是在预拉形后的淬火热处理过程中形成的,并对缺陷形成机理进行了研究和讨论。2A12 alloy is widely used in the production of aircraft structural parts,such as fuselage skin.Stretch forming is an important processing technology for skin parts.The surface defects in the stretch forming process and subsequent treatment will seriously affect the service life of the skin.By means of macroscopic observation,chemical composition and microstructure analysis,the coarser grains on the surface of 2A12 aluminum alloy after chemical milling were comprehensively analyzed.It is considered that the coarser grains of 2A12 aluminum alloy are formed in the quenching heat treatment process after pre-stretch forming,and the formation mechanism of defects was studied and discussed.

关 键 词：2A12铝合金 粗大晶粒 临界变形 化铣 

分 类 号：TG339[金属学及工艺—金属压力加工]