Study on phase transformation kinetics and temperature field prediction of wire circles in the Stelmor air-cooling process
The Stelmor air-cooling process after wire rolling is very critical to its final microstructure and properties,and the two-way coupling of austenite phase transformation and temperature field is a major problem in the temperature field prediction of wire air-cooling process.Therefore,the temperature field and phase transformation of wire during Stelmor air-cooling process were studied,and the three-dimensional model and phase transformation kinetic mathematical model of wire air-cooling process were established.The CFD simulation method was used to solve the heat transfer coefficient.It is found that the heat transfer coefficient of the wire lapping point region is much smaller than that of the non-lapping point region,and the heat transfer coeffi-cient of the wire lapping point region changes periodically with time.The difference of heat transfer coefficient between the upper and lower surfaces of the same section of the wire rod is 70-100 W/(m2·K).The finite difference method is used to calculate the mathematical model of the phase transformation kinetics and the temperature field of the wire under the air-cooling condition.The temperature field of the wire is obtained.It is found that the maximum temperature difference of the wire during the cooling process is 30-50 ℃,which is in good agreement with the field measurement data.This shows that the model can be used to predict the temperature field and phase transformation process of the air-cooling process of industrial production of wire circles.
wire circlesStelmor air-cooling lineconvective heat transfer coefficienttemperature fieldnumerical simulationphase transformation
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