基于瞬态传热的含裂缝环形锻件传热模型

针对目前热态锻件存在的裂缝问题，提出了一种基于传热理论的含裂缝锻件传热模型。首先，基于微元体的传热特性，推导满足微元体热平衡关系的导热微分方程，并以瞬时热流量为中介变量，对传热系数、热导率进行了修正。其次，设定环形锻件内外环境边界条件、裂缝有限空间自然对流边界条件，进而建立了多边界条件下含裂缝的热态环形锻件传热模型，利用分离变量法求解该传热模型。最后，应用有限元软件对含不同尺寸裂缝的环形锻件传热模型进行模拟，通过试验验证了仿真分析及传热模型的可行性。

Heat Transfer Model of Ring Forgings with Cracks Based on Transient Heat Transfer

A heat transfer model for cracked forgings based on heat transfer theory was proposed to solve the crack problems in hot forgings.Firstly， the model was based on the heat transfer characteristics of micro bodies， and the differential equation of heat conduction was derived， which satisfied the thermal balance relationship of micro elements.The heat transfer coefficient and thermal conductivity were corrected by taking instantaneous heat flux as an intermediary variable.Secondly，the set of natural convection boundary conditions， internal and external environment of ring forgings crack finite space boundary conditions were distinguished， and then the boundary conditions of hot forging ring heat transfer models with crack were established， and the separation variable method was used to solve the heat transfer model.Finally， the finite element software was used to simulate the heat transfer model of annular forgings with different size cracks， and the validity and feasibility of the heat transfer model was verified.