CAJ | 학술논문

以热模拟实验为基础，建立固溶态GH4169合金的动态再结晶模型，应用DEFORM-3D有限元软件模拟圆柱状试样在不同压缩变形条件下的动态再结晶体积分数分布；结合金相定量分析、电子背散射衍射(Electron backsatter diffraction (EBSD))分析及有限元模拟结果，对比研究变形参数对圆柱状GH4169合金心部微观组织的影响。研究结果表明：升高变形温度及降低应变速率，均可促进圆柱状GH4169合金热模拟压缩试样变形的均匀性；应变速率的降低可加速GH4169合金中小角度晶界向大角度晶界的转变过程；GH4169合金的动态再结晶形核机制为以原始晶界为主的非连续动态再结晶，在试验变形条件下，孪晶界的演化对动态再结晶过程起重要作用；同时，分析实验结果与模拟结果之间的差异及其原因。
이열모의실험위기출，건립고용태GH4169합금적동태재결정모형，응용DEFORM-3D유한원연건모의원주상시양재불동압축변형조건하적동태재결정체적분수분포；결합금상정량분석、전자배산사연사(Electron backsatter diffraction (EBSD))분석급유한원모의결과，대비연구변형삼수대원주상GH4169합금심부미관조직적영향。연구결과표명：승고변형온도급강저응변속솔，균가촉진원주상GH4169합금열모의압축시양변형적균균성；응변속솔적강저가가속GH4169합금중소각도정계향대각도정계적전변과정；GH4169합금적동태재결정형핵궤제위이원시정계위주적비련속동태재결정，재시험변형조건하，련정계적연화대동태재결정과정기중요작용；동시，분석실험결과여모의결과지간적차이급기원인。
Dynamic recrystallization (DRX) model of the annealed GH4169 alloy was established based on the thermal-mechanical simulation tests. The finite element analysis software DEFORM-3D was introduced to simulating the DRX volume of the cylindrical annealed GH4169 alloy under different deformation conditions. Combined quantitative metallographic analysis, electron backscatter diffraction (EBSD) analysis with finite element analysis, the effects of the deformation parameters on the microstructures of the center for the cylindrical samples were investigated. The results show that increasing the deformation temperature and lowering the strain rate would promote the deformation homogeneity of the cylindrical samples during thermal-mechanical simulation tests. The transformation procedure of grain boundaries with low angles and with high angles is accelerated with decreasing the strain rate. The nucleation mechanism of the dynamic recrystallization for the alloy is the discontinuous one dominated mainly by the bulging of the original grain boundaries. Under the tested conditions, the evolution of twin boundaries plays an important role in the course of the dynamic recrystallization. Meanwhile, the differences between the experimental results and the simulation results as well as its reasons are also analyzed.