粉末冶金Ti-47Al-2Nb-2Cr合金热变形组织模拟  

Microstructure Simulation of Powder Metallurgy Ti-47Al-2Nb-2Cr Alloy during Hot Deformation Process

作　　者：袁大庆[1] 董洪波[1] 余新平[1] 

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2016年第11期1142-1146,共5页Special Casting & Nonferrous Alloys

基　　金：航空科学基金资助项目(2015ZE56011);江西省科学计划资助项目(20151BBE50042)

摘　　要：利用Ti-47Al-2Nb-2Cr合金的高温热压缩试验数据建立了动态再结晶模型,并结合元胞自动机法(CA),通过DEFORM-3D有限元软件对试样热变形过程的微观组织进行模拟。结果表明,在变形温度为950℃,应变速率为0.1s-1条件下,热变形过程中的试样微观组织发生了动态再结晶,晶粒尺寸得到细化,模拟得到大变形区域的晶粒尺寸为0.63μm,对比试验数据可知,模拟结果和试验结果相符。观察在950℃下不同应变速率时的CA模拟形貌可知,随着应变速率提高,由于晶粒发生动态再结晶,形成再结晶晶粒,使得平均晶粒尺寸不断变小。对比EBSD微观组织形貌可知,CA模拟较好地反映了其组织变化趋势。The dynamic recrystallization model of Ti-47Al-2Nb-2Cr alloy was established with high temperature hot compressive data.Combined with the cellular auto mata model（CA）,the microstructure evolution during the hot deformation process was simulated by the DEFORM-3Dsoftware.The experimental results show that the dynamic recrystallization occurs and grain size is refined with the deformation at 950℃and the strain rate at about 0.1s-1.The average grain size at the severe deformation zone is about 0.63μm,which is well agreement with the simulated ones.The microstructures of CA simulation was observed with different strain rates at 950 ℃.Due to occurrence of dynamic recrystallization,the average grain size is decreased with the increase of strain rate.The CA simulation of microstructure evolution can reflect the EBSD morphology.

关 键 词：TI-AL合金 动态再结晶 元胞自动机 微观组织 

分 类 号：TF125.22[冶金工程—粉末冶金]