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在多元合金CAFE模型的基础上,分析了微观组织参数(形核密度、高斯分解参数、Gibbs-Thomson系数等)与430不锈钢凝固过程中晶粒形貌的复杂关系,以及过热度与冷却强度等工艺参数对凝固组织的影响.研究发现,晶粒尺寸和柱状晶向等轴晶转变不仅与体最大形核过冷度有关,也受体形核密度的影响.高斯分解参数和Gibbs-Thomson系数增大时,一次枝晶间距减小,等轴晶范围增大;但当它们增加至一定范围后,其对显微结构的影响逐渐变得不明显.过热度或冷却强度增大时,等轴晶范围减小,但一次枝晶间距的变化不明显.
Based on the multi-alloy CAFE model, the complex relationship between the microstructure parameters (nucleation density, Gaussian decomposition parameters, Gibbs-Thomson coefficient, etc.) and the grain morphology in the solidification of 430 stainless steel was analyzed, as well as superheat and cooling strength The effect of process parameters on the microstructure was studied.The results show that the grain size and the equiaxed crystal growth are not only related to the maximum undercooling of the bulk but also the density of the acceptor nuclei.Gaussian decomposition parameters and Gibbs-Thomson coefficients When increasing, the dendrite spacing decreases and the range of equiaxed grains increases. However, when they increase to a certain extent, their influence on the microstructure gradually becomes insignificant. When superheat or cooling strength increases, etc. The range of axial crystal decreases, but the change of primary dendrite spacing is not obvious.