应变路径对TiAl合金残余片层的影响  

Influence of strain path on residual lamella of TiAl alloy

作　　者：李栋 朱彬 陈逸 程亮 LI Dong;ZHU Bin;CHEN Yi;CHENG Liang(School of Materials and Engineering,Jiangsu University of Technology,Changzhou 213001,China)

机构地区：[1]江苏理工学院机械工程学院,江苏常州213001

出　　处：《塑性工程学报》2023年第9期173-179,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51905233;5210130372);江苏省研究生实践创新计划项目(XSJCX21-30)。

摘　　要：针对全片层组织TiAl合金开坯锻造后存在大量残余片层影响合金的塑性的问题,在TiAl合金(α+γ)相区进行等温压缩,研究了不同应变路径对TiAl合金残余片层的影响,压缩方向与锻造方向分别呈0°、45°和90°。结果表明:初始锻造组织由大量的残余片层和片层团间的再结晶晶粒构成。经过0°方向热变形后组织变得更加均匀,残余片层显著减少;45°方向压缩的试样组织均匀,残余片层基本全部分解;经过90°方向压缩,试样部分残余片层分解,变形后的残余片层界面与压缩方向呈90°。改变应变路径有利于残余片层的分解,45°方向压缩的试样流变软化程度最小,晶粒等轴度高,分解效果最好。In view the problem of the plasticity of TiAl alloy with full lamella structure affected by a large number of residual lamella after bloom forging,the isothermal compression was carried out in TiAl alloy(α+γ)phase region,the influence of different strain paths on the residual lamella of TiAl alloy was studied.Compression directions and forging direction are 0°,45°and 90°,respectively.The results show that the initial forging structure consists of a large number of residual lamella and recrystallized grains between lamellar clusters.After hot deformation in 0°direction,the microstructure becomes more uniform and the residual lamella decreases significantly.The specimen compressed in 45°direction has uniform microstructure,and the residual lamella are basically decomposed.After compression in 90°direction,part of the residual lamella of sample is decomposed,and the deformed residual lamella interface is 90°to the compression direction.The change of strain path is beneficial to the decomposition of residual lamella.The sample compressed in 45°direction has the lowest rheological softening degree,high grain isometric degree and the best decomposition effect.

关 键 词：TIAL合金 应变路径 等温压缩 残余片层 

分 类 号：TB125[理学—工程力学]