高钒合金型内熔化扩散温度场及钒含量分布模拟

Temperature Field and Vanadium Content Distribution Simulation of High-Vanadium Alloy In-mold Melting Diffusion

利用ANSYS软件建立V9Cr4高钒合金型内熔化扩散有限元模型,模拟了浇铸5CrNiMo合金液后凝固过程中高钒合金棒不同位置处的温度;基于合金棒轴向温度变化不大的模拟结果,将合金元素的三维扩散简化成二维扩散,建立径向钒元素含量分布数学模型,计算了径向钒元素含量并进行了试验验证。结果表明:浇铸时合金棒的温度高于其固相线温度,说明高钒合金棒与5CrNiMo合金能实现冶金结合;由温度分布曲线确定钒元素的扩散时间为810 s,将其代入钒元素含量分布数学模型,计算得到的不同位置处钒元素含量与测试结果的相对误差小于1%,说明建立的型内熔化扩散有限元模型较为准确,可以利用其模拟结果来计算钒元素含量分布。

A finite element model of in-mold melting diffusion of V9 Cr4 high-vanadium alloy was established with ANSYS software, and then the temperature change at different spots in the high-vanadium alloy rod was simulated during solidification after casting 5 CrNiMo alloy liquid. According to the simulation that the axial temperature of the alloy rod changed little, the three-dimensional diffusion of alloy elements was simplified to two-dimensional diffusion, and the mathematical model for vanadium content distribution along radial direction was established. The vanadium content along radial direction was calculated and was verified by experiments. The results show that the temperatures of the alloy rod were higher than its solidus temperature during casting, indicating the metallurgical bonding between the high-vanadium alloy and 5 CrNiMo alloy. The diffusion time of vanadium was determined to be 810 s from the temperature distribution curve. This diffusion time was substituted into the mathematical model for vanadium content distribution and then the vanadium content at different spots was obtained. The relative errors between the calculated content and the testing results were less than 1%, indicating that the established finite element model of in-mold melting diffusion was accurate, and its simulation could be used to calculate the vanadium content distribution.