Numerical simulation of decarburization behavior of spring steel during isothermal heating process
Surface decarburization of spring steel is the main reason for its fatigue life,for which many scholars have proposed va-rious models to simulate its decarburization behavior.Considering the oxidation behavior in the decarburization process,a two-di-mensional oxidation-decarburization synthetic model of spring steel billet based on finite volume method was proposed.Isother-mal heating experiments were carried out on 55SiCr spring steel in air atmosphere.Under the conditions of 950-1 150 ℃ and 30-150 min isothermal heating,the thickness of the oxide layer changed with time in a parabolic trend.According to the experimental results,the calculation model of the oxide layer thickness of 55SiCr spring steel was established.According to Ficks second law,the two-dimensional decarburization mathematical model of 55SiCr spring steel was established.The two models were combined to obtain the two-dimensional oxidation-decarburization synthetic model of spring steel billet.The model can quantitatively describe the effects of heating temperature and holding time on the surface decarburization of spring steel.The prediction results of the decarburization model were compared with the experimental results,which verified the effectiveness of the model.
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