Abstract
Abstract To clarify the evolution of interfacial features between MnO-SiO2 type inclusions and Si-Mn killed steel during isothermal heating at low temperatures, two diffusion couple samples were investigated under heat treatment at 1173 K and 1273 K, respectively. The experimental results show that the diffusion of oxygen from the oxide to the alloy is the restrictive link of the solid-state reaction between MnO-SiO2-FeO oxide and steel matrix at low heating temperatures. With increasing heating time or temperature, more FeO in the oxide decomposed, and the resulting oxygen diffused into the alloy and reacted with Mn and Si elements. The critical heating temperature at which the interfacial reaction can occur was determined to be 1173 K. And a dynamic model that predicts the change in the width of the particles precipitation zone at low temperatures was also established based on Wagner equation.
Highlights
Effective control of non-metallic inclusions in steel is important for improving performance of steel products
The experimental results show that the diffusion of oxygen from the oxide to the alloy is the restrictive link of the solid-state reaction between MnO-SiO2-FeO oxide and steel matrix at low heating temperatures
The composition of the alloy was analyzed by an electron probe microanalyzer (EPMA)
Summary
Effective control of non-metallic inclusions in steel is important for improving performance of steel products. Many researches on the removal and modification of Recently, much more attention has been paid to the behavior of non-metallic inclusions during heat treatment. Li et al [15] investigated the behavior of Al-Ti-O inclusion in Fe-Al-Ti alloy during heat treatment. Due to the diffusion of Al and O elements in the inclusions during heating at 1573 K, heterogeneous irregular Al-Ti-O inclusions with Al-rich and Ti-rich parts, forming from the homogeneous spherical ones, were observed. Ren et al [16] studied the evolution of oxide inclusions in 304 stainless steel during isothermal heating at temperatures of 1273 K to 1473 K. It’s found that the MnO-SiO2 type inclusions changed to MnO-Cr2O3 type inclusions after heat treatment. With increasing heat-treatment temperature or reducing inclusion size, the transformation rate of inclusions increased
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