Finite element method for predicting spring steel casting blank decarburization

The invention discloses a finite element method for predicting spring steel casting blank decarburization, and belongs to the technical field of rolled steel heating furnaces. The finite element method comprises the following steps: a thermocouple is independently arranged on each position of the upper surface of a casting blank, the lower surface of the casting blank and the center of the cross section of the casting blank, and each thermocouple enters the heating furnace along with a temperature tracking tester to be heated; finite element software DEFORM is utilized to establish a casting blank temperature field calculation model, a thermocouple test result is used for repeatedly checking a simulated temperature field result until an applied boundary condition causes a simulation calculation result to be consistent with the thermocouple test result; a carbon diffusion model is established in the casting blank; and a practical detection result is used for correcting a model calculation result to enable the model to accurately predict a spring steel casting blank decarburization situation under a practical operating mode condition. The finite element method has the advantages that the model simulation calculation result is compared with a practical detection result, and the accuracy of the calculation model can be favorably guaranteed.