Abstract
We develop a finite volume method for the simulation of the liquid iron cored wire feeding spheroidization technology, which can realize the visualization of the spheroidization process and provide guidance for parameter optimization. In this work, we first define a two-dimensional unsteady heat-transfer mathematical model for single-core structure cored wire melting in liquid iron and then discretize the governing equation numerically. The present solver is validated by comparing it with the data obtained from experimental studies. Interestingly, in the numerical results we found that the absorption velocity of the magnesium element can be improved to the greatest extent to get the most ideal spheroidizing effect. To further show the melting and boiling characteristics of spheroidization, we also explore the relationship between melting and boiling depth, wire feeding speed, and temperature of liquid iron in the feeding process, and the wire feeding speed–depth function was also obtained.
Highlights
Liquid iron spheroidizing treatment is an important research subject in the field of cast iron metallurgy;1,2 understanding the various process factors of spheroidization is a necessary prerequisite for improving production efficiency
Extruded passivated magnesium wire of Φ13 mm is applied for wire feeding spheroidization treatment of liquid iron
To reduce the explosive velocity of pure magnesium in liquid iron, a fluoride passivator is applied to the surface of magnesium wire for passivation treatment
Summary
Liquid iron spheroidizing treatment is an important research subject in the field of cast iron metallurgy; understanding the various process factors of spheroidization is a necessary prerequisite for improving production efficiency. The absorption rate of Ca in molten steel treated by the wire feeding method was studied by Kumar and Mishra, but the dynamic heat transfer rules of the melting process of the cored wire were not given. We obtained the dynamic heat transfer rules of single-cored wire in molten iron, and the model can provide theoretical guidance for parameter optimization of wire feeding spheroidization in production. In order to further explore the melting and boiling characteristics of the spheroidizing process, the variation rules of the melting and boiling depth with wire feeding speed and temperature were studied It provides theoretical and technical support for the realization of scientific, intelligent, and visual control of the molten iron feeding process.
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