Prediction method of steel organization, prediction apparatus of steel organization, and program

摘要

PPROBLEM TO BE SOLVED: To provide a method for predicting a steel structure by which the steel structure generated in a phase-transformation after hot-working is predicted highly precisely in the case of hot-working a medium carbon steel, to which alloy elements are added, the structure . PSOLUTION: When the chemical components, a hot-working condition and a cooling speed of the steel material are input into a thermodynamic calculation software 12, the thermodynamic quantity is calculated with CALPHAD (Computer Calculation of Phase Diagram) method. Based on the calculated thermodynamic quantity, parameters, such as -transformation starting time, pro-eutectoid -nuclear developing speed, pro-eutectoid -growing speed, are calculated. These parameters are gradually renewed while considering C concentration in the remained . The calculated parameter is input an integrated phase transformation model 10 and the volume ratio calculated. Successively, based on the calculated thermodynamic quantity, the filling-up of the starting condition of P transformation is judged , and in the case of judging that this condition is filled-up, based on the calculated thermodynamic quantity, parameters of P nuclear developing speed, P growing speed, etc., are calculated and P volume ratio is calculated by inputting the calculated parameters into the integrated phase transformation model 10. PCOPYRIGHT: (C)2008,JPO&INPIT