大型高温合金锻坯加热及冷却过程模拟

Simulation on temperature field of large superalloy billet in heating and cooling process

以传热学为基础,基于ANSYS Fluent有限元软件,通过整体求解法对整体加热炉和大型高温合金GH4698锻坯的温度场进行了模拟研究。利用Fluent UDF编程实现加热炉中的反馈调节系统;冷却过程为出炉空冷,通过计算坯料与空气的对流换热系数,然后利用UDF实现锻坯冷却过程中边界条件的设置。通过模拟和实验结果比较验证可知,锻坯升温和降温的模拟曲线与实测曲线趋势基本一致。由模拟和实验的误差曲线分析可知,在加热过程中,加热段误差较大,而保温段误差较小;冷却过程中高温段误差较大,而低温段误差较小,并分析了模拟和实验误差产生的原因。

Based on heat transfer theory and the ANSYS Fluent software,the temperature field of the overall heating furnace and large superalloy GH4698 billet was simulated and researched through the integral solution method,and the Fluent UDF was used to realize the feedback regulating system in the furnace.The cooling process is air cooling,and by calculating the heat transfer coefficient of the billet and air,the boundary condition was set up by UDF program in cooling process.Through the comparison of the simulated and experimental results,it is found the simulated heating and cooling temperature curves are basically consistent with the trend of measured curves.The analyse of the error curves of simulations and experiments suggests that in the heating process,the error of the heating section is big while the error of the holding section is small;during the cooling,the error of the high temperature section is larger while the error of the low temperature section is smaller.The reasons of simulation and experiment errors were analyzed.