Abstract: Based on the empirical electron theory (EET) of solids and molecules, combined with the chemical composition of the microalloyed Q355B steel, the statistical values of electronic structure parameters of alloy were calculated. On the basis of the traditional alloy electronic structure model, the volume fraction of ferrite, the grain size and volume fraction of pearlite, and the lamellar spacing of pearlite were introduced to correct the model, and a new prediction model was proposed. Starting from grain refinement strengthening, solid solution strengthening, phase interface strengthening, precipitation strengthening and pearlite phase transformation strengthening, the mechanical properties mechanism model of microalloyed Q355B hot-rolled steel was established, and the tensile strength, yield strength, elongation and impact energy were calculated respectively. Comparing the calculated values of the traditional model and this model with the experimental values, the results show that the predicted relative errors of this model for tensile strength, yield strength, elongation and impact energy are 0.07%, 0.84%, 6.27%, and 3.40%, respectively. The absolute errors are 0.4 MPa, 3.9 MPa, 1.7% and 1.1 J, respectively. Compared with the traditional model, the prediction result of this model is very accurate, and the prediction of elongation and impact energy is greatly improved, indicating that the prediction result of this model is closer to the experimental value.
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2024, Vol. 38 
