论文部分内容阅读
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 was established by using high-temperature thermal compression test data of Ti-47Al-2Nb-2Cr alloy. Combined with the cellular automata method (CA) and the DEFORM-3D finite element software, the microstructure of the hot deformation process simulation. The results show that the microstructure of the samples during the hot deformation has been dynamically recrystallized at a deformation temperature of 950 ℃ and a strain rate of 0.1 s-1. The grain size is refined and the grain size of the deformed region is simulated The size of 0.63μm, comparative test data shows that the simulation results and test results. Observing the CA simulation morphology at 950 ° C at different strain rates shows that as the strain rate increases, the recrystallized grains are formed due to the dynamic recrystallization of the grains, so that the average grain size becomes smaller and smaller. Comparing the microstructure of EBSD shows that the CA simulation better reflects the trend of its organization.