Formation of Acicular Ferrite in Mg Treated Ti-bearing C–Mn Steel

Song, Mingming; Song, Bo; Hu, Chunlin; Xin, Wenbin; Song, Gaoyang

doi:10.2355/isijinternational.55.1468

Cited by 34 publications

(21 citation statements)

References 19 publications

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“…Huang et al [34,39,40] who considered inclusions up to 7 lm, observed 1.5 lm as the upper critical value but described a sharp decrease in the nucleation probability above 4 lm, resulting in inert behavior of inclusions larger than 6.5 lm. Similar results were gained by Song et al [41] and Wang et al [42] who found inclusions with sizes ranging from 1 to 3 lm and 1 to 2 lm, respectively, as the most appropriate nuclei. Inclusions below and above these ranges were less active.…”

Section: A Acicular Ferrite Amountsupporting

confidence: 77%

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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Section: A Acicular Ferrite Amountsupporting

confidence: 77%

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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“…Particularly the number of inclusions smaller than 3 µm in steel No.3 is significantly higher than that of steel No.2. Previous study found that the size of inclusion which can induce the nucleation of acicular ferrite in steel is mainly concentrated in the range of less than 3 µm . This means that Ti–Mg treatment steel will be better than Ti alone for the nucleation of acicular ferrite.…”

Section: Discussionmentioning

confidence: 97%

Effect of Ti–Mg Treatment on the Impact Toughness of Heat Affected Zone in 0.15%C–1.31%Mn Steel

Song

Chun-lin

Song

et al. 2017

steel research int.

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The influence of Ti-Mg and Ti on the impact toughness of the heat affected zone in steel has been studied comparatively. The changes of microstructure and grain size in the heat affected zone are analyzed. It has been found that the content of acicular ferrite in the steel treated by Ti-Mg is more than that in the steel treated by Ti. The size of the primary austenite grain in Ti-Mg treated steel is smaller than that in the steel treated by Ti. During the welding thermal cycle, the second phase particles in steel can be re-dissolved and coarsened. After welding, the second phase particles in Ti-Mg treated steel are smaller than those in Ti treated steel, and the number of the second phase particles in Ti-Mg treated steel is more than that in Ti treated steel. The pinning effect of the second phase particles in Ti-Mg treated steel is obvious stronger than that in Ti treated steel. The impact toughness of the heat affected zone has a significant improvement after the addition of Ti-Mg.

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“…The Table 2 listed the optimal size of inclusions reported in some references. 9,15,[30][31][32][33] In this study, hundreds of Ti-Zr oxides in 2#Steel were chosen by SEM-EDS for statistical analysis. The proportion of effective inclusions inducing ferrite nucleation in each size was shown in Fig.…”

Section: Effect Of Inclusion Size On the Af Nucleationmentioning

confidence: 99%

Formation of Non-Metallic Inclusion and Acicular Ferrite in Ti–Zr Deoxidized Steel

et al. 2019

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The formation of non-metallic inclusion and acicular ferrite (AF) during solidification is investigated by high temperature experiment, thermodynamic calculation and metallurgical analysis. The size distribution and composition of inclusions are carried out by optical microscope (OM), scanning electron microscope (SEM) equipped with energy-dispersive spectrometer (EDS) and image process software. The results indicate that adding Ti-Zr can modify the inclusions from Mn-Si-O-MnS to Ti-Zr-O-MnS, and the average size of inclusions can be refined obviously from 2.38 μm to 1.56 μm. The critical size of inclusion inducing AF is 0.21-0.37 μm, and the optimized size for AF nucleation induced by Ti-Zr-O-MnS inclusion is in range of 1.0-3.0 μm in this study. Moreover, for inducing AF nucleation, the inclusion larger than critical size is only necessary condition but not sufficient condition. A Mn-depletion zone resulted by MnS precipitating on Ti-Zr-O inclusion is observed adjacent to the Ti-Zr-O inclusion, which is believed to be one of the possible mechanisms to promote the nucleation of AF.

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Formation of Acicular Ferrite in Mg Treated Ti-bearing C–Mn Steel

Cited by 34 publications

References 19 publications

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

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

Effect of Ti–Mg Treatment on the Impact Toughness of Heat Affected Zone in 0.15%C–1.31%Mn Steel

Formation of Non-Metallic Inclusion and Acicular Ferrite in Ti–Zr Deoxidized Steel

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