6061铝合金盘件辗压成形材料流动规律及微观组织分布研究

Research on materials flow law and microstructure distribution on roll forming of 6061 aluminum alloy disk parts

通过6061铝合金盘件的双面辗压成形工艺试验,结合数值模拟和微观组织检测,对辗压成形过程中的盘件形状变化、材料流动规律以及微观组织分布规律进行了研究。通过小进给、多道次辗压成形铝合金盘件,材料主要流动趋势是向盘件边缘流动,其次在盘件中心夹头附近有材料堆积现象;采用数值模拟分析发现,应变速率主要集中于盘件与辗压头的接触位置,等效应变沿着盘件轴向从变形区表面到中心逐渐减小;通过电子背散射衍射(EBSD)分析变形区组织分布特征,发现从变形区表面到中心,晶粒尺寸逐渐增大,再结晶体积分数逐渐减小。研究结果对辗压工艺的设计具有参考作用。

Through double-sided roll forming experiments of 6061 aluminum alloy disk parts,combined with numerical simulation and microstructure inspection,the shape change,the metal flow law and the microstructure distribution law of disk parts during the roll forming process were studied.Then,the aluminum alloy disk parts was formed by small feed and multi-pass roll forming,the main flow trend of material was to flow to the edge of disk parts,and secondly,there was material accumulation near the chuck in the center of disk part.The numerical simulation analysis shows that the strain rate is mainly concentrated on the contact position between disk part and rolling head,and the equivalent strain gradually decreases from the surface to the center of the deformation zone along the axis direction of disk parts.In addition,the microstructure distribution characteristics of the deformed zone were analyzed by EBSD(Electron-backscattered diffraction),and it was found that the grain size gradually increased and the recrystallized volume fraction gradually decreased from the surface of the deformation zone to the center.Thus,the research results have a reference for the design of the roll forming process.