中间退火后冷轧变形量对2E12铝合金组织和性能的影响  

Effect of Cold Rolling Deformation on Microstructure and Properties of 2E12 Aluminum Alloy after Intermediate Annealing

作　　者：陈忱[1] 郑林峰[1] 曹瑶琴[1] 伊琳娜[2] 

机构地区：[1]中国直升机设计研究所,江西景德镇333001 [2]北京航空材料研究院,北京100095

出　　处：《热加工工艺》2017年第9期139-141,共3页Hot Working Technology

摘　　要：对中间退火后不同冷轧变形量的板材显微组织进行了对比分析,利用电子背散射衍射(EBSD)观察了不同变形量轧制的板材纵向面的晶粒再结晶、亚晶分布情况,采用中心穿透裂纹(CCT)试样测定了疲劳裂纹扩展速率,研究了中间退火后冷轧变形量对板材的晶粒取向和耐损伤性能的影响规律。结果表明,随着中间退火后的冷轧变形量的增加,晶粒细化,且小角度晶界的数量减少;中间退火后的冷轧变形量为40%时,其力学性能最为优异,但变形量增加至50%时,其裂纹扩展速率不合格;2E12铝合金薄板中间退火后的冷轧变形量以40%为宜。The microstructure of the sheet with different cold rolling deformation after intermediate annealing was analyzed. The grain reerystaUization and the sub-grain distribution on the longitudinal surface of the rolled sheet with different deformation were observed by electron backscatter diffraction （EBSD）. The fatigue crack growth rate was measured by a central penetration crack （CCT） specimen. The effects of cold rolling deformation on the grain orientation and the damage resistance of the sheet after the intermediate annealing were studied. The results show that with the increase of cold rolling deformation after intermediate annealing, the grain is refined and the number of small angle grain boundaries is reduced; when the amount of cold rolling deformation after intermediate annealing is 40%, the mechanical properties are the most excellent, but the deformation increases to 50%, the crack propagation rate is unqualified; after intermediate annealing, 2E12 aluminum alloy sheet cold rolling deformation of 40% is appropriate.

关 键 词：2E12铝合金 冷轧变形量 显微组织 力学性能 

分 类 号：TG339[金属学及工艺—金属压力加工]