Ti-6Al-4V-2Fe合金的多向锻造工艺有限元模拟及微观组织研究  

FEM simulation and microstructure investigation on multi-directional forging process for alloy Ti-6Al-4V-2Fe

作　　者：张毅宁[1] 张悦[1] 李萍 孟庆刚[3] 

机构地区：[1]鞍山师范学院物理科学与技术学院,辽宁鞍山114005 [2]沈阳和世泰通用钛业有限公司生产技术部,辽宁沈阳110206 [3]中国科学院金属研究所,辽宁沈阳110016

出　　处：《锻压技术》2017年第8期12-16,共5页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(11275007)

摘　　要：采用有限元方法,对Ti-6Al-4V-2Fe合金的9次换向锻造工艺过程进行了热力耦合数值模拟,获得了合金在该变形工艺下的温度场和应变场的演化规律,并结合温度计算结果,分析了合金锻件内部6个典型位置的金相组织。研究结果表明:工件内大部分区域的变形在β单相区完成,由于这部分区域的降温速率和变形量均较小,所以转变组织为片层状魏氏组织,并存在明显的原始β晶界;在工件表面区域,由于变形温度很快降至α+β两相区内,所以最终转变为网篮组织;随着换向锻造工艺的逐步进行,工件内部的等效应变量逐步增加,锻后等效应变值的分布由中心向表面逐渐减小。Nine forging processes with different directions of alloy Ti-6Al-4V-2Fe were conducted by thermo-mechanical coupled simulation,and the temperature field and equivalent strain field during whole deformation processes were obtained. Then,the microstructures at six typical positions in workpiece were analyzed combining with the temperature calculation result. The results indicate that the most of deformation interior to the workpiece is conducted on β single phase region,and the lamellar Widmanstatten structure with primitive β grain boundary can be observed because of the small cooling rate and deformation. Finally,because the temperature cools into α ＋β double phase regions with high cooling rate,the workpiece surface transformes to basket weave structure. Thus,the equivalent strain increases as the forging step is gradually carried out,and the equivalent strain deceases gradually from center to surface.

关 键 词：钛合金 多向锻造 温度场 等效应变场 有限元 微观组织 

分 类 号：TG319[金属学及工艺—金属压力加工]