摘要
在变形温度为 80 0～ 1 0 4 0℃ ,应变速率为 0 0 0 1～ 5 0s-1和高度压缩量为 5 0 %的条件下 ,实验获得了TC6钛合金的流动应力 ,并在相同变形条件下定量研究了α相晶粒尺寸的变化。分析实验研究结果 ,建立了TC6钛合金在高温变形时的本构关系 ,并给出了表征TC6钛合金高温变形时α相晶粒尺寸演变的Yada模型。应用FEM模拟了TC6钛合金蜗轮盘在等温锻造过程中α相晶粒尺寸的变化。研究了变形工艺参数 (压下量、变形温度、变形速度和摩擦因子 )对零件内部α相晶粒尺寸的影响。
In this paper, isothermal compression tests were conducted on Thermecmaster-Z, with 800～1040 of deformation temperature, 0.001～50 of strain rate and 50% of reduction in hight. Grain size of phase was measured on Leica LABOR-LUX12MFS/ST microscope for quantitative metallography with QUANTIMET 500 software of image analysis. According to the present experimental results, constitutive relationship of the TC6 alloy was established and a model for microstructure evolution with the help of Yada's equation was investigated. Combining FEM and the present model for microstructure evolution, grain evolution phase is simulated during isothermal disk forging of TC6 alloy. The present results illustrate grain size and distribution of phase during disk forging of TC6 alloy in detail. The simulation results show that height reduction, temperature and strain has more significant effect on grain size of phase than that of friction between deformed body and die.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2003年第9期791-794,共4页
China Mechanical Engineering
基金
国家重大基础研究发展规划资助项目 (G2 0 0 0 0 672 0 6)
