一种基于蒙特卡罗技术的晶粒生长计算机模拟方法

将蒙特卡罗(MC技术引入到晶粒生长模拟中,结合焊接工艺试验和热模拟试验,模拟了单相合金焊接热影响区(HAZ)晶粒生长过程。首先应用实验和统计学的方法确定了材料晶粒生长的动力学模型,然后计算了焊接热循环,同时基于蒙特卡罗技术编制了模拟程序。最后在不同焊接热输入情况下,模拟了晶粒生长过程。模拟结果动态演示了晶粒生长过程,并且体现了焊接热钉扎效应。模拟得出数据与试验结果非常接近,为评定焊接工艺和材料可焊性提供了依据。

A computer simulation method of grain growth based on MC technology

In this paper,Monte Carlo(MC)technology with welding experiments and thermal simulation experiments were introduced to simulate the grain growth process in welding heat affected zone(HAZ) of a single phase alloy.First,a kinetic model was defined by both experimental and statistics method.Then the thermal cycle was calculated and at the same time the simulation program was worked out based on MC technology.At last the grain growth process in HAZ was simulated during different welding heat input,which have great influence on grain growth in HAZ.The result of the simulation demonstrats the grain growth process dynamically and embodys the"thermal pin effect".Good agreement between MC simulation results and the experimental results was obtained which can provide a reliable evidence for evaluating the welding craft and the weldability.