Deformation mechanism of cold ring rolling in view of texture evolution predicted by a newly proposed polycrystal plasticity model  

基于新晶体塑性模型预测织构演化的环件冷轧变形机制(英文)

作　　者：李宏伟[1] 冯璐[1] 杨合[1] 

机构地区：[1]西北工业大学材料学院,凝固技术国家重点实验室,西安710072

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第12期3729-3738,共10页中国有色金属学报（英文版）

基　　金：Project (51175428) supported by the National Natural Science Foundation of China;Project (B08040) supported by Program of Introducing Talents of Discipline to Universities ("111"Project),China

摘　　要：An explicit polycrystal plasticity model was proposed to investigate the deformation mechanism of cold ring rolling in view of texture evolution. The model was created by deducing a set of linear incremental controlling equations within the framework of crystal plasticity theory. It was directly solved by a linear algorithm within a two-level procedure so that its efficiency and stability were guaranteed. A subroutine VUMAT for ABAQUS/Explicit was developed to combine this model with the 3D FE model of cold ring rolling. Results indicate that the model is reliable in predictions of stress-strain response and texture evolution in the dynamic complicated forming process; the shear strain in RD of the ring is the critical deformation mode according to the sharp Goss component （{110}？100？） of deformed ring; texture and crystallographic structure of the ring blank do not affect texture type of the deformed ring;texture evolves rapidly at the later stage of rolling, which results in a dramatically increasing deformation of the ring.提出一种新的多晶体塑性模型以从织构演化角度研究环件冷轧过程的变形机制。该模型是在晶体塑性理论框架内通过推导一套线性增量控制方程建立的。该模型可以用线性求解方法直接求解,并采用一个两步法的求解过程,确保模型计算的效率和稳定性。基于ABAQUS/Explicit平台开发了用户材料子程序VUMAT,以实现该模型与环件冷轧三维有限元模型的结合。结果表明,该模型在预测动态复杂成形过程中的应力应变响应和织构演化方面都是可靠的;从轧制环件中很强的Goss织构{110}100看出,环件轧向的剪切变形是环件冷轧过程中的主要变形;环坯的织构和晶体结构对轧制环件中的织构类型的影响不大;在冷轧的后期环件织构演化迅速,这导致了这一时期环件的快速长大。

关 键 词：cold ring rolling crystal plasticity texture evolution explicit algorithm 

分 类 号：TG335.12[金属学及工艺—金属压力加工]