合金化热镀锌镀层组织的数值模拟及应用

Numerical Simulation of Alloying Microstructure of Hot-Dip Galvanizing Coating and Development of Relevant Computational Software

建立数学模型可确定热浸镀锌合金化变化状况,进而可改进其工艺,消除锌层在冲压时的粉化。在建模中是以锌为主扩散元素,还是以铁为主,目前仍不统一。基于热浸镀锌合金化过程中的组织演变规律及相变机理,以锌为主扩散元素,建立了一种合理的数学模型,采用数值解法及C语言编程来模拟合金化镀层组织生长规律;同时应用Visual C++6.0平台开发了GA钢板镀层组织模拟计算软件。以连续镀锌合金化工艺最优参数,将合金化工艺参数输入,计算出ζ,δ和Γ相的生长厚度、镀层铁含量及Zn浓度-距离分布,分析η和ζ相消失的合金化时间点,能计算δ相内无浓度梯度的合金化时间点,以便控制Γ相的快速生长。根据计算结果和合金化过程分析报告可优化合金化参数,模拟获得最佳镀层显微组织。结果表明:该软件具有较为全面的输入参数、预测结果准确和操作简单等优点,对指导热浸镀锌合金化工艺有重要的实际应用价值。

A mathematical model was established with a view to the microstructure evolution and phase transformation mechanism of galvanizing coating so as to better recognize the variation of the alloying microstructure and to provide guidance to modifying galvanizing technology.The growth law of the alloying microstructure of galvanizing coating was simulated with numerical analysis and C language programming as well.Moreover,a computational software was developed based on Visual C++6.0 platform to simulate and calculate the microstructure of galvanizing coating,and the thickness of ζ,δ and Γ phases as well as the Fe content and Zn concentration-distance distribution of the galvanizing coating were calculated in relation to the optimal galvanizing parameters.Results indicate that the established computational software is advantageous with comprehensive inputting parameters,precise prediction results and simple operation,and it can be well used to guide the modification of the technology for hot-dip galvanizing.Besides,the alloying parameters of hot-dip galvanizing coating can be optimized based on relevant computational results and analysis report on its alloying procedure,thereby simulate and determine its optimal microstructures.