喷射沉积7075SiCp铝基复合材料挤压变形的数值模拟.pdfVIP

第 17 卷第 12 期 中国有色金属学报 2007 年 12 月 w,)J 7No.12 The Chinese Journal of Nonferrous Metals D田.2007 文章编号: 1004-0609(2007) 12-2054-05 喷射沉积7075/SiC 铝基复合材料挤压变形的数值模拟 p 雷敏，张辉，李落星 (湖南大学材料科学与工程学院，长主Þ 410082) 摘 要z 采用 Deform-2D 有限元软件对喷射沉积 7075/SiCp铝基复合材料挤压变形进行数值模拟。模拟采用的挤 压变形条件为2 挤压比4-100，键坯预热温度 30Q.-450 C，挤压杆速度 2-20 mmls。结果表明z 在挤压变形区内 应力及温度变化剧烈，且在模子入口处均出现最大值:挤压比和挤压速度越大，应力越大，温度效应也越显著。 喷射沉积7075/SiC 铝基复合材料最佳挤压条件为 35Q.-400 C 、挤压比 1 6-50、挤压杆速度5-15 2 链坯预热温度 p mmls. 数值模拟结果和工艺实验测量值吻合较好。 关键词: 7075AVSiCp复合材料z 喷射沉积:挤压:刚塑性有限元:数值模拟 中固分类号: TG 146 文献标识码:A Numerical simulatioo 00 extrusioo deformatioo of spray-deposited 7075/SiCp alumioum matrix composite LEIM尬， ZHANGH邸， LI Luo-xing (College ofMaterials Science and Engineering, Hunan University , Changsha 410082 , China) Abstract: The extrusion deformation of spray-deposited 7075AνSiC composite was simulated by using rigid-plastic p fmite element method (FEM) on DEFORM-2D soft word. The condition of numerical simulation on extn且sion deformation is that the extrusion ratio is 4一100， preheating temperature ofbillet is 300-450 C and extrusion ram speed is 2-20 mmls. The results indicate 阳t the maximum stress and temperature occur in the die entry section.ηle stress and temperaωre effect increase with increasing extrusion ratio and ram speed.τhe optimal prωessing p缸缸neters for the extrusion of 7075AVSiC composi始缸e obtained as follows: the billet preheating temp