挤压件尺寸对等径角挤压成形工艺的影响  

Effect of Extrusion Forgings Sizes on Forming Process in Equal Channel Angular Pressing

作　　者：赵小莲[1,2] 赵宁宁[2] 陈娜[2] 

机构地区：[1]广西大学有色金属及材料加工新技术教育部重点实验室,广西南宁530004 [2]广西大学材料科学与工程学院,广西南宁530004

出　　处：《热加工工艺》2013年第13期76-79,83,共5页Hot Working Technology

基　　金：广西自然科学基金资助项目(桂科青0832006);广西大学有色金属及材料加工新技术教育部重点实验室开放基金项目(GXKFJ-17)

摘　　要：为了通过大塑性变形技术制备出满足工业需求的大尺寸块体超细晶材料,采用有限元法模拟了不同尺寸挤压件的1、2道次等径角挤压过程,得到了各挤压件的等效应变、等效应力和载荷曲线。分析得出:挤压件尺寸对等效应变的大小和分布以及等效应力的大小影响甚微;但随着挤压件尺寸的增大,等效应力和2道次等效应变的分布均匀性降低,挤压载荷增大。这表明:经过多道次等径角挤压的大尺寸挤压件可以获得晶粒分布均匀的大块体超细晶材料。In order to meet the industrial demands for large-sized bulk ultrafine-grained materials, which were prepared by severe plastic deformation, the process of equal channel angular pressing was simulated by the finite element method. And the curves of equivalent strain, equivalent stress and load of different-sized extrusion forgings were gotten. It is obtained that extrusion forgings sizes have little effect on the values and distribution of equivalent strain, as well as the values of equivalent stress. However, with the increase of extrusion forgings sizes, the distribution uniformity of equivalent stress and 2-passes equivalent strain decrease, but the extrusion load increases. This indicates that： the large-sized extrusion forgings after multi-passes the equal channel angular pressing can obtain the hulk ultra-fine grain materials of even distribution.

关 键 词：大塑性变形 挤压件尺寸 等径角挤压 有限元模拟 

分 类 号：TG376.2[金属学及工艺—金属压力加工]