Interactions between Exogenous Magnesia Inclusions with Endogenous Inclusions in a High Alloyed Steel Melt

Abstract

Interactions between exogenous MgO particles and endogenous inclusions on the surface of a high alloyed steel melt have been investigated in situ in a high temperature confocal laser scanning microscope. Exogenous magnesia particle forms immediately a liquid Mg-Si-Al-Ti-Cr phase surrounding the solid particle. The real attraction forces between the liquid layer surrounding MgO particles and endogenous Al 2 O 3 inclusions are determined in the range of 6 Â 10 À18 N to 1 Â 10 À16 N. In contrast to earlier investigations with exogenous Al 2 O 3 particles, lower real attraction forces between exogenous and endogenous particle pairs have been observed in comparison to endogenous inclusions pairs.

Experimental study of phase equilibria in the Al2O3–MgO–TiO2 system and thermodynamic assessment of the binary MgO–TiO2 system

“…One way to reduce the amount of non‐metallic inclusions is steel melt filtration using ceramic filters. The carbon bonded materials based on Al 2 O 3 and MgO are suggested as foam ceramic filters with functionalized filter surface . The filter surface can be functionalized by active coating based on the same chemical composition or crystal structure as non‐metallic inclusions.…”

Cluster Detection of Non‐Metallic Inclusions in 42CrMo4 Steel

“…One of the main issues in the determination of the damage‐relevant inclusion size is, therefore, definition and detection of clusters and their size. In principle, NMIs can form clusters by sticking to each other in a molten metal . A cluster then is a group of sintered NMIs, which is physically equivalent to one big NMI in particular in terms of damage relevance.…”

Agglomeration Behavior of Non-Metallic Particles on the Surface of Ca-Treated High-Carbon Liquid Steel: An In Situ Investigation

“…It was indicated by Kang et al that although attractive behavior between pure-alumina particles could be observed, capillary forces between the other particles were too weak to be detected. Aneziris et al [13,14] and Schröder et al [15] have also conducted in situ investigation on agglomeration behaviors between various surface particles in stainless steel by putting Al 2 O 3 , spinel and MgO particles on top of steel samples in a CSLM. Although Al 2 O 3 showed strong attraction forces [13], MgO showed a much weaker attraction force [15], and in the case of spinel there were no agglomerations [14].…”

“…Aneziris et al [13,14] and Schröder et al [15] have also conducted in situ investigation on agglomeration behaviors between various surface particles in stainless steel by putting Al 2 O 3 , spinel and MgO particles on top of steel samples in a CSLM. Although Al 2 O 3 showed strong attraction forces [13], MgO showed a much weaker attraction force [15], and in the case of spinel there were no agglomerations [14]. To the authors' best knowledge, there are no studies focusing on in situ observation of the agglomeration behavior of sulfide particles, which have significant importance in production of high-carbon steel.…”