| abstract |
Provided is a steel material structure prediction method for accurately predicting a steel material structure generated by phase transformation after hot working when medium carbon steel to which an alloy element is added is hot-worked. When a chemical component of steel, a hot working condition, and a cooling rate are input to a thermodynamic calculation software 12, a thermodynamic quantity is calculated by a CALPHAD method. Parameters such as α transformation start time, pro-eutectoid α nucleation rate, pro-eutectoid α growth rate are calculated based on the calculated thermodynamic quantities. These parameters are sequentially updated in consideration of the C concentration of the remaining γ. The calculated parameters are input to the integrated phase transformation model 10 to calculate the α volume ratio. Next, satisfaction of the P transformation start condition is determined based on the calculated thermodynamic quantity, and parameters such as P nucleation rate and P growth rate are calculated based on the calculated thermodynamic quantity. Then, the calculated parameters are input to the integrated phase transformation model 10 to calculate the P volume ratio. [Selection] Figure 2 |