凝固过程微熔池温度场数值模拟及分析  

Numerical Simulation and Analysis of Temperature Field in Micro-Molten Pool During Solidification

作　　者：苏新磊 赵定国 陈洋 王书桓 孙鑫 崔小杰 SU Xin-lei;ZHAO Ding-guo;CHEN Yang;WANG Shu-huan;SUN Xin;CUI Xiao-jie(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210

出　　处：《铸造》2022年第3期340-345,共6页Foundry

基　　金：国家自然科学基金(51774139,52074128);河北省自然科学基金(E2020209014,E2019209597)。

摘　　要：采用数值模拟软件对微米和毫米尺度微熔池凝固过程中的温度场进行了模拟,探究了微熔池凝固过程中温度场和固相的变化规律,并对比了20μm和20 mm熔池凝固过程中温度场和固相变化的异同。结果表明,20μm、30μm和40μm熔池的温度降低到固相线温度用时分别为7.2 ms、11.1 ms和14.3 ms,平均速率分别为24135℃/s、14685.9℃/s、12064.2℃/s,表明微熔池具有快速凝固、急速冷却的特点。20 mm熔池凝固用时9.2 s,平均冷却速率为19.4℃/s,凝固时间和平均冷却速率远大于微熔池的数值。Numerical simulation software was used to simulate the temperature field in the solidification process of micrometer and millimeter scale micro-pool,and the variation rules of the temperature field and solid phase in the solidification process of the micro-pool were explored and analyzed,and the similarities and differences of the temperature field and solid phase change in the solidification process of 20μm and 20 mm molten pool were compared.The results showed that the temperatures of the 20μm,30μm and 40μm molten pool were reduced to the solid line temperature for 7.2 ms,11.1 ms and 14.3 ms,respectively,and the average rates were 24135℃/s,14685.9℃/s and 12064.2℃/s,respectively,indicating that the micro-molten pool had rapid solidification and rapid cooling features.The solidification time of the 20 mm molten pool was 9.2 s,and the average cooling rate was 19.4℃/s,and its solidification time and average cooling rate were much higher than that of the micro molten pool.

关 键 词：微熔池 温度场 数值模拟 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]