6061铝合金热旋压变形不均匀性的数值模拟和实验研究  

Numerical Simulation and Experimental Study on Deformation Heterogeneity of 6061 Aluminum Alloy in Hot Spinning

作　　者：刘光军 丁桦[1] 姜壹夫 李光宇 LIU Guangjun;DING Hua;JIANG Yifu;LI Guangyu(College of Materials Science and Engineering,Northeastern University,Shenyang 110000,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110000

出　　处：《热加工工艺》2023年第5期96-101,共6页Hot Working Technology

摘　　要：采用ABAQUS软件对6061铝合金无芯模的热旋压过程进行数值模拟分析,系统分析了管坯厚度方向的不均匀变形;采用电子背散射衍射(EBSD)技术分析了旋压之后合金的位错密度、微观组织和晶粒尺寸,并与数值模拟的结果进行对比。结果表明:6061铝合金无芯模的热旋压加工过程中管坯外层比中间和内层有更大的变形和更高的温度,压应力从管坯外表面沿着厚度方向逐渐降低,导致管坯外层材料比中间和内层具有更高的位错密度和更强的动态再结晶驱动力,进而提高管坯外层晶粒的再结晶分数,细化外层晶粒。实验结果与模拟结果吻合度较好,验证了有限元模型的可靠性。The coreless die hot spinning process of 6061 aluminum alloy was numerically simulated and analyzed by using ABAQUS software,and the non-uniform deformation along the tube billet thickness direction was analyzed systematically.The dislocation density,microstructure and grain sizes of the alloy after spinning were analyzed by electron backscatter diffraction(EBSD),and compared with the numerical simulation results.The results show that during the hot spinning process of 6061 aluminum alloy without core die,the outer layer of the tube billet has greater deformation and higher temperature than those of the middle and inner layer.The compressive stress decreases gradually along the thickness direction from the outer surface of the tube billet,which results in higher dislocation density and stronger dynamic recrystallization driving force than the middle and inner layers,thus increasing the recrystallization fraction of the outer grain of the tube billet and refining the outer grain.The degree of coincidence between the experimental results and the simulation results is good,and the reliability of the finite element model is verified.

关 键 词：热旋压 不均匀变形 数值模拟 再结晶 晶粒细化 

分 类 号：TG386.41[金属学及工艺—金属压力加工]