idRHa+ProMod - Rail Hardening Control System

International Conference on Materials, Processing and Product Engineering 2015

Ferro, L.^1

Primetals Technologies Italy, Marnate, Italy^1

关键词: Austenite decomposition;    Elasto-plastic bending;    Finite element procedure;    Heat of transformation;    Optimization criteria;    Simulation environment;    Thermal expansion coefficients;    Thermo-physical property;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/119/1/012006/pdf
DOI  :  10.1088/1757-899X/119/1/012006

来源: IOP

【 摘 要 】

idRHa+ProMod is the process control system developed by Primetals Technologies to foresee the thermo-mechanical evolution and micro-structural composition of rail steels subjected to slack quenching into idRHa+ Rail Hardening equipments in a simulation environment. This tool can be used both off-line or in-line, giving the user the chance to test and study the best cooling strategies or letting the automatic control system free to adjust the proper cooling recipe. Optimization criteria have been tailored in order to determine the best cooling conditions according to the metallurgical requirements imposed by the main rail standards and also taking into account the elastoplastic bending phenomena occurring during all stages of the head hardening process. The computational core of idRHa+ProMod is a thermal finite element procedure coupled with special algorithms developed to work out the main thermo-physical properties of steel, to predict the non-isothermal austenite decomposition into all the relevant phases and subsequently to evaluate the amount of latent heat of transformation released, the compound thermal expansion coefficient and the amount of plastic deformation in the material. Air mist and air blades boundary conditions have been carefully investigated by means of pilot plant tests aimed to study the jet impingement on rail surfaces and the cooling efficiency at all working conditions. Heat transfer coefficients have been further checked and adjusted directly on field during commissioning. idRHa+ is a trademark of Primetals Technologies Italy Srl.