Abstract: A method to calculate the heat transfer coefficient is proposed by using finite element software combined with experimental calculation that is based on measured temperature curves, carrying out the nonlinear coupling on various factors which have influence on the heat transfer coefficient of U75V rail steel (/% : 0. 74C, 0. 76Si, 0. 82Mn, 0. 014P, 0. 028S, 0. 071V) , the geometric model of the heat transfer coefficient of steel in quenching process is established and the heat transfer coefficient is obtained by iterative program of calculated heat transfer coefficient prepared with Python language. Using calculated heat transfer coefficient as a known boundary conditions, the simulation on temperature field of rail spray quenching coupled with phase transition in the DEFORM-3 D is carried out. The simulated-calculation cooling-curve corresponds to the measured cooling curve.

摘要： 提出一种利用有限元软件结合实验计算换热系数的方法,根据实测的温度曲线,将影响U75V钢轨(/%:0.74C,0.76Si,0.82Mn,0.014P,0.028S,0.071V)换热系数的诸多因素进行非线性耦合,建立了换热系数的几何模型,通过Python语言编制计算换热系数的迭代程序,求得该钢淬火过程的换热系数。以计算的换热系数作为已知边界条件,在DEFORM-3D中对耦合了相变的钢轨喷雾淬火的温度场进行模拟,模拟计算的冷却曲线与实测冷却曲线一致。