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Effect of crystal orientation on the ductility in AZ31 Mg alloy sheets produced by equal channel angular rolling


Shearing deformation was applied to AZ31 magnesium alloy sheets by a new concept processing, socalled equal channel angular rolling (ECAR) processing for the development of a different crystal orientation compared with the asreceived sheets.


Improvement of Drawability at Room Temperature in AZ31 Magnesium Alloy Sheets Processed by Equal Channel Angular Rolling


A new rolling process, socalled as equal channel angular rolling (ECAR) process, for fabricating the magnesium alloy sheets with an enhanced formability at room temperature is introduced.




 In order to produce the smallsize bar in use of the bigsize billet without making much investment in equipment and adding rolling pass, roll slitting bar rolling technique is developed on continuous rolling mill with threestand, groupdriven by single motor. This slitting technique is introduced as follow: it consists of two preslitting passes and one slitting pass, adopting parallel flathexagonal pass, a square piece is sliced into two flathexagonal pieces by three passes. The desired goal of the technique... In order to produce the smallsize bar in use of the bigsize billet without making much investment in equipment and adding rolling pass, roll slitting bar rolling technique is developed on continuous rolling mill with threestand, groupdriven by single motor. This slitting technique is introduced as follow: it consists of two preslitting passes and one slitting pass, adopting parallel flathexagonal pass, a square piece is sliced into two flathexagonal pieces by three passes. The desired goal of the technique has been reached, and the results in the production cost of tonnage bar decreased by 10% and in the yield of manhour increased to 50% have been attained.  为了不进行较大设备投资,不增加轧制道次,实现用大规格坯料轧制小规格棒材,在棒材厂的组合传动三机架连轧机列上开发了轧辊切分工艺,该切分工艺包括两个预切分道次,一个切分道次,采用并联扁六角切分孔型,经三个道次将方轧件切分成两条扁六角轧件,该工艺达到了预期目的,同时取得吨材生产成本下降 10%,机时产量增加 50%的效果。  In this paper, a nonlinear finite element modeling for the process of cross wedge rolling is presented with the aid of ANSYS/LS DYNA The reason causing concavity on the end of workpiece has been found The rule that the factor such as forming angle,spread angle,length of workpiece end and length of rolled part affect concavity has been summarized and the rule is consistent with experiment result by comparing This study is significant to properly determine the technology parameters of cross wedge rolling and... In this paper, a nonlinear finite element modeling for the process of cross wedge rolling is presented with the aid of ANSYS/LS DYNA The reason causing concavity on the end of workpiece has been found The rule that the factor such as forming angle,spread angle,length of workpiece end and length of rolled part affect concavity has been summarized and the rule is consistent with experiment result by comparing This study is significant to properly determine the technology parameters of cross wedge rolling and increase utilization ratio of material  用ANSYS/LS DYNA软件对楔横轧轧制过程进行非线性有限元模拟 ,得到轧件端头凹心的形成原因 ,总结出模具成形角、展宽角、轧件端头尺寸及轧细长度等因素对轧件端头凹心大小的影响规律 ,并将计算结果与实验结果进行比较 ,其规律一致。本研究对合理确定楔横轧工艺参数、提高材料利用率具有重要的意义  Severe plastic deformation (SPD) is a very effective way for grain refinement, which even can be used to produce nanostructured materials. Large number of new SPD methods are developed and studied. The manipulation of some of these methods, such as equal channel angular pressing, high pressure torsion shear, continuous confined strip shearing, cyclic extrusion compression, constrained groove pressing, repetitive corrugation and straightening, accumulative roll bonding is introduced. And the maximum strain, efficiency... Severe plastic deformation (SPD) is a very effective way for grain refinement, which even can be used to produce nanostructured materials. Large number of new SPD methods are developed and studied. The manipulation of some of these methods, such as equal channel angular pressing, high pressure torsion shear, continuous confined strip shearing, cyclic extrusion compression, constrained groove pressing, repetitive corrugation and straightening, accumulative roll bonding is introduced. And the maximum strain, efficiency of grain refinement and equation to calculate strain are also reviewed.  强变形是细化晶粒的有效方法,甚至可以制备纳米材料,最近十几年来大量的强变形方法涌现出来,研究也越来越多。介绍了等通道角挤压、高压扭转、连续限制带材角轧挤、循环挤压、限制斜槽压缩、反复弯曲校平、累积叠轧焊等方法,回顾了各种方法可以得到的最大应变量、细化晶粒效果及应变量计算公式。阐述了强变形及剪切变形细化晶粒的机制。  
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