Thermodynamic Simulation of Carbonitride Precipitation in Micro-alloyed Steel

Authors

Weigang Li, 1. School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;;2. Engineering Research Center for Metallurgical Automation and Measurement Technology of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;
Yang Wei, 1. School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;;
Liu Chao, 1. School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;;
Baokang Yan, 1. School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;;

Abstract

Abstract: A mathematical model for calculating the precipitation of carbonitride in the process of hot rolling of composite micro-alloyed steel is established, and the interaction between the carbonitride and AlN is considered. In view of the difficulties of the thermodynamic model that the variables are multiple, the equations are nonlinear and the boundary conditions are determined difficultly, the Newton-Raphson numerical algorithm characterized by coupled problem is adopted. The precipitation starting temperature and precipitation sequence of carbonitride and AlN at different compositions are determined. The equilibrium composition of elements in austenite, the composition and mass fraction of carbonitride precipitates, as well as other variation laws with the rolling temperature are obtained. The simulation and analysis are carried out based on the actual production data of a steel plant. The results show that the model is basically in accordance with the relevant metallurgical mechanism, which has an important guiding significance for the effective control of the microstructure and properties of steel.

Recommended Citation

Li, Weigang; Wei, Yang; Chao, Liu; and Yan, Baokang (2019) "Thermodynamic Simulation of Carbonitride Precipitation in Micro-alloyed Steel," Journal of System Simulation: Vol. 31: Iss. 3, Article 18.
DOI: 10.16182/j.issn1004731x.joss.17-0147
Available at: https://dc-china-simulation.researchcommons.org/journal/vol31/iss3/18

First Page

520

DOI Link

https://doi.org/10.16182/j.issn1004731x.joss.17-0147

Last Page

527

CLC

TP391.9

Recommended Citation

Li Weigang, Yang Wei, Liu Chao, Yan Baokang. Thermodynamic Simulation of Carbonitride Precipitation in Micro-alloyed Steel[J]. Journal of System Simulation, 2019, 31(3): 520-527.

DOI

10.16182/j.issn1004731x.joss.17-0147