高强韧镁合金大规格型材挤压成形的数值模拟及实验研究  

Numerical Simulation and Experimental Study on Extrusion Forming of High Strength Tough Magnesium Alloy Large Size Profiles

作　　者：王敬丰[1,2] 彭星 王奎 胡豪[2,3] 高诗情 王金星[2,3] 潘复生 Wang Jingfeng;Peng Xing;Wang Kui;Hu Hao;Gao Shiqing;Wang Jinxing;Pan Fusheng(Chongqing University,Chongqing 400044,China;National Engineering Research Center for Magnesium Alloys,Chongqing 400044,China)

机构地区：[1]重庆大学国家镁合金材料工程技术研究中心,重庆400044 [2]国家镁合金材料工程技术研究中心,重庆400044 [3]重庆大学,重庆400044

出　　处：《稀有金属材料与工程》2020年第5期1665-1673,共9页Rare Metal Materials and Engineering

基　　金：国家重点研发计划项目(2016YFB0301102);国家自然科学基金面上项目(51874062);中央高校基本科研业务费专项项目(2018CDGFCL0005,2019CDXYCL0031)。

摘　　要：本研究利用HyperXtrude软件对大规格高强韧Mg-9Gd-4Y-1Zn-0.8Mn合金轨道交通用支撑梁型材进行了型材结构优化前后的数值模拟,在保证大规格高强韧镁合金支撑梁型材能成功挤压成形的前提下,确定出了优选工艺,即挤压温度470℃,挤压速度0.3 mm/s,该工艺下所需最大挤压力为34606 kN。成功制备出了表面质量良好、成分均匀、组织均质的轨道交通用大规格高强韧镁合金支撑梁型材。型材各区域的抗拉强度在370 MPa以上,延伸率在10%以上,最高强度达到391 MPa;时效态的强度提高明显,达到460 MPa以上,延伸率略微下降,超过8%,最高强度达到475 MPa。HyperXtrude software was used to simulate the profile structure of the large-size high-strength and tough Mg-9 Gd-4 Y-1 Zn-0.8 Mn alloy rail transit support beam. Under the premise of ensuring the successful extrusion of large-size high-strength and tough magnesium alloy support beam profiles, the preferred process was determined, in which the extrusion temperature is 470℃, the extrusion speed is 0.3 mm/s, and the maximum pressing force required under the process is 34 606 kN. The large-size high-strength and tough magnesium alloy support beam profile used in rail transit with good surface quality, uniform composition and homogeneous structure was successfully prepared. The tensile strength of each part of the profile is above 370 MPa, the elongation is above 10%, and the highest strength is 391 MPa. The strength of the aging state is obviously improved, reaching 460 MPa or more, and the elongation is slightly decreased, exceeding 8%. The highest strength reaches 475 MPa.

关 键 词：高强韧镁合金 挤压成形 数值模拟 力学性能 

分 类 号：TG379[金属学及工艺—金属压力加工]