钛合金冷坩埚定向凝固过程温度场数值模拟  

Numerical simulation of temperature field in cold crucible for directional solidification of Ti alloys

作　　者：王艳丽[1] 郭景杰[2] 傅恒志[2] 

机构地区：[1]北京航空材料研究院先进高温结构材料国防科技重点实验室,北京100095 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《哈尔滨工业大学学报》2008年第11期1808-1810,共3页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50395102);国家重大基础研究项目(G20067202-2)

摘　　要：基于电磁场Maxwell方程组以及带有一定运动速度的连续介质凝固模型,建立了连续熔铸与定向凝固过程温度场数值计算模型,并对线圈匝数为4匝、输入电流密度为6.6×1010A/m2、电源频率为50 000 Hz时,扁形锭的电磁感应加热升温过程进行了模拟研究,得出了Ti-6Al-4V合金的温度场变化情况.结果显示,从开始加热的几十秒时间内,扁形铸锭温度上升很快;接近100 s时,铸锭温度分布趋于稳定;接近300 s时,铸锭自身基本达到热量平衡.Based on the Maxwell equations and the solidification heat transfer model, the numerical simulation of temperature fields in Ti ingots was conducted for the continuous melting and directional solidification. The temperature fields in Ti-6Al-4V ingots under different currents and coil turns were calculated. Results show that the temperature of the ingots increases sharply at the initial tens of seconds the distribution of temperature fields gets to be stable after the ingots being heated for about 100 seconds; and after about 300 s, the thermal equilibrium in the ignots is basically reached.

关 键 词：钛合金 定向凝固 近矩形冷坩埚 温度场 

分 类 号：TG146.4[一般工业技术—材料科学与工程]