含孔隙7055铝合金材料包套锻造工艺与材料改性研究  

Research on canned forging process and material modification of 7055 aluminum alloy with voids

作　　者：韩啸 陈飞[1] 崔振山[1] HAN Xiao;CHEN Fei;CUI Zhen-shan(Institute of Forming Technology&Equipment,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200030,China)

机构地区：[1]上海交通大学材料科学与工程学院塑性成形与技术装备研究院,上海200030

出　　处：《塑性工程学报》2022年第11期85-94,共10页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(U2037204)。

摘　　要：为了提升快速单元凝固法制备的7055铝合金材料的致密度和力学性能,进行了包套锻造实验,探究了不同包套材料和锻造温度对孔隙闭合和力学性能的影响。为了确定包套锻造的工艺窗口,建立了三维热加工图并对包套锻造过程进行了数值模拟,利用三维热加工图确定了包套锻造的热加工温度和应变速率区间,利用数值模拟确定了包套厚度。实验结果表明,在420~500℃温度范围内进行包套锻造实验时,温度越高,7055铝合金的力学性能越好。温度相同时,与选用7075铝合金作为包套进行锻造相比,选用45钢作为包套进行锻造后7055铝合金的力学性能更好。7055铝合金在500℃下用4 mm厚的45钢进行包套锻造(总压下量为50%)后,材料的抗拉强度由48.92 MPa提高到373.28 MPa,伸长率由3.31%提高到21.32%。To improve the density and mechanical properties of 7055 aluminum alloy prepared by the rapid unit solidification method,the canned forging experiments were carried out to explore the effects of different canning materials and forging temperatures on void closure and mechanical properties.To determine the process window for canned forging,the three-dimensional hot processing map was established,and the canned forging process was simulated numerically.The ranges of hot processing temperature and strain rate in canned forging were determined by three-dimensional hot processing map,and the thickness of canning was determined by the numerical simulation.The experimental results show that when the canned forging experiments are carried out at 420-500℃,the higher the temperature is,the better the mechanical properties of 7055 aluminum alloy are.When the temperature is the same,compared with choosing 7075 aluminum alloy as canning to carry out the forging,the mechanical properties of 7055 aluminum alloy are better after forging using 45 steel as canning.After forging for 7055 aluminum alloy with 45 steel as canning(thickness of 4 mm)at 500℃(the total rolling reduction is 50%),the tensile strength of material increases from 48.92 MPa to 373.28 MPa,and the elongation increases from 3.31%to 21.32%.

关 键 词：铝合金 包套锻造 力学性能 孔隙闭合 

分 类 号：TG316.2[金属学及工艺—金属压力加工]