关于电塑性拔丝和其结构演变的讨论  

Comments on electroplastic drawing and its structure evolution

作　　者：郑明新[1,2] 朱永华[1,2] 唐国翌 张华堂[1,2] Г.Е.КОДЖАСПИРОВ 

机构地区：[1]清华大学机械工程系 [2]俄罗斯圣彼得堡工业大学材料科学中心

出　　处：《清华大学学报（自然科学版）》1998年第2期28-32,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金

摘　　要：简介了几种常用钢种电塑性拔丝的主要实验结果，综合分析钢丝电塑性变形不同层次结构的演变过程，对电塑性变形的机制问题进行了讨论。在微观结构层次上，电塑性效应基本上产生于强脉冲电流的电子对运动位错的激活作用，推动滑移变形的发展。在介观层次上，高密度的脉冲电流造成大量超弥散结构的伸长区，十分有利于向错的大量发射，实现变形的转动机制，导致大的变形甚至超塑性变形。这是电塑性变形最本质阶段。宏观层次上，强电流的脉冲刺激，主要在于减弱织构的发展，改善组织的形态，造成有利的应力应变状态。A brief exposition of primary achievements in studies on electroplastic drawing technology of some conventional steels was given. Throughout a comprehensive analysis of multiscale structure evolution on electroplastic deformation of the steels, some comments on the problem with mechanisms of electroplastic deformation were offered. At microlevel, electroplastic effect stems basically from the promotive action of electrons of short powerful current impulses on moving dislocations, developing the slip deformation. At mesolevel, high density current impulses creat forming of large quantities of stretched regions with ultradisperse structure, which facilitate intensive launching of disclinations and realization of rotation mechanism, that lead to a large deformation, even to the superplasticity. This is the essential stage for electroplastic deformation. At macrolevel, the strong electrostimulation mainly consists in weakening the development of texturallization, improving the form of structures, bringing up favourable stress deform conditions.

关 键 词：电塑性 电拔丝 电子位错 结构层次 

分 类 号：TG356.46[金属学及工艺—金属压力加工]