EBSD analysis of magnesium addition on inclusion formation in SS400 structural steel

Luo, Sin Jie; Su, Yen Hao Frank; Lu, Muh Jung; Kuo, Jui Chao

doi:10.1016/j.matchar.2013.05.013

Cited by 24 publications

(11 citation statements)

References 19 publications

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“…Moreover, from the element mapping figures (Figures 4(b)∼4(f)), it can be seen that the element of sulfur congregates at the inclusions margin. This phenomenon is also confirmed by Luo et al [16]. They found that MnS can heterogeneously nucleate on MgAl 2 O 5 at 1523 K and suggested that 2 ppm Mg addition resulted in the inclusion formation change from MnS-Al 2 O 3 to MnS-MgAl 2 O 5 .…”

Section: Resultssupporting

confidence: 79%

The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions

Kong

Zhou

Lin

et al. 2015

Advances in Materials Science and Engineering

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The features of inclusion and microstructure for carbon structural steel containing Mg-Al-O inclusions were studied through the scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS). It can be seen that, in Mg-Al-O inclusions, the elements of Mn, Si, and S coexist, and their central mole ratio of Mg/Al varies in a wide range. This value for most inclusions is larger than 0.5, which suggests the formation of solid solution between MgAl2O4and MgO. After etching, the typical microstructure of intragranular acicular ferrites is observed, which is due to the nucleation effect induced by Mg-Al-O inclusions. From the SEM-EDS mapping images, it is found that the element of sulfur accumulates on the periphery of nucleation inclusion. Moreover, line EDS analysis hints that Mn-depletion zone (MDZ) exists in steel matrix, which is adjacent to the complex inclusion. Combined with the theoretical analysis, this phenomenon can be explained by the absorption of Mn due to the magnesium vacancy in MgAl2O4, and this MDZ promotes the nucleation of intragranular acicular ferrite. Through statistical analysis of SEM images for microstructure, the probabilistic nature of inducing nucleation effect is revealed. These results may be helpful to clarify the nature of oxide metallurgy.

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Section: Resultssupporting

confidence: 79%

The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions

Kong

Zhou

Lin

et al. 2015

Advances in Materials Science and Engineering

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“…The upper size limit for 99 pct of inclusions is marked with a cross for each case. In the literature, several authors [33][34][35][36] described a boost in nucleation potential with the increasing inclusion size, which is in good accordance with earlier findings of Ricks et al [37,38] However, it should be noted that in many cases also, a lower and an upper critical sizes for active inclusions are defined. The lower critical value is the minimum size beneath which particles are too small to act as active nuclei.…”

Section: A Acicular Ferrite Amountsupporting

confidence: 82%

“…This value was determined to be 0.3 to 0.5 lm in various studies. [34,39,40] Ricks et al, [37,38] Lee et al [34] and Mu et al [33][34][35][36] investigated inclusions smaller than 1.5 lm and defined 1 lm as the upper critical value. Above 1 lm, the probability curve flattens out.…”

Section: A Acicular Ferrite Amountmentioning

confidence: 99%

On the Capability of Nonmetallic Inclusions to Act as Nuclei for Acicular Ferrite in Different Steel Grades

Loder

Michelic

Mayerhofer

et al. 2017

Metall Mater Trans B

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Acicular ferrite nucleates intragranularly on nonmetallic inclusions, forming a microstructure with excellent fracture toughness. The formation of acicular ferrite is strongly affected by the size, content, and composition of nonmetallic inclusions, but also by the composition of the steel matrix. The potential of inclusions in medium carbon HSLA (high-strength low-alloyed) steels has been the main focus in the literature so far. The current study evaluates the acicular ferrite capability of various inclusions types in four different steel grades with carbon contents varying between 0.04 and 0.65 wt pct. The investigated steels are produced by melting experiments on a laboratory scale and subsequent heat treatment in a High-Temperature Laser Scanning Confocal Microscope. Inclusions are exclusively formed by deoxidation and desulfurization reactions. No synthetic particles are added to the melt. The inclusion landscape is analyzed by Scanning Electron Microscopy. Final ductility of the samples is evaluated based on performed tensile tests. Inclusion types in every steel grade are assessed regarding their nucleation potential always considering the interaction with the steel composition, especially focusing on the role of manganese. The effects of (Ti,Al)O x -, MnS-, and MgO-containing inclusions are discussed in detail.

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“…As compared to wire B, the addition of more Mg to the flux for wire C leads to the change in the oxide formation from Al 2 O 3 to MgO, promoting the refinement and dispersion of inclusions. MgO inclusions can provide more favorable nucleation sites for the nucleation of AF at a higher nucleation rate [2,[26][27][28][29]. Fig.…”

Section: Effect Of Morphology and Composition Of Inclusionsmentioning

confidence: 99%

Effect of inclusions on microstructure and toughness of deposited metals of self-shielded flux cored wires

Zhang

Kou

et al. 2015

Materials Science and Engineering: A

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EBSD analysis of magnesium addition on inclusion formation in SS400 structural steel

Cited by 24 publications

References 19 publications

The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions

The Mechanism of Intragranular Acicular Ferrite Nucleation Induced by Mg-Al-O Inclusions

On the Capability of Nonmetallic Inclusions to Act as Nuclei for Acicular Ferrite in Different Steel Grades

Effect of inclusions on microstructure and toughness of deposited metals of self-shielded flux cored wires

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