Effects of Si and Al on acicular ferrite formation in C-Mn steel

Shim, Jae-Hyeok; Cho, Young Whan; Shim, Jae-Dong; Oh, Young-Joo; Byun, Jung-Soo; Lee, Dong Nyung

doi:10.1007/s11661-001-0103-0

Cited by 33 publications

(29 citation statements)

References 17 publications

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“…Mizoguchi and Takamura . and Shim et al observed that Al 2 O 3 inclusions cannot provide the nucleation sites for acicular ferrite. Also, no acicular ferrite is observed in S1 sample in the present research.…”

Section: Discussionmentioning

confidence: 99%

Effect of Mg Addition on the Characterization of γ-α Phase Transformation During Continuous Cooling in Low Carbon Steel

Min

Liu

et al. 2015

steel research int.

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The influence of magnesium on the phase transformation and mechanical properties has been investigated by means of dilatometric and microstructural analysis in low carbon microalloyed steel. The thermal simulation experiments were performed on a Gleeble-3800 system equipped with a high-speed deformation dilatometer. The results reveal that, by adding with Mg, the pearlite transformation is delayed, and the pearlite has a scattered distribution even at low cooling rates from 0.1 to 0.5 K/s. It also shows that Mg tends to promote the bainite transformation as a result of the formation of acicular ferrite and granular bainite. Acicular ferrite is attributed to the change of dominant oxide inclusions from inert Al 2 O 3 , to xMgO Á Al 2 O 3 , which serves as an effective nucleant for acicular ferrite. Moreover, bainitic structure obtained by the addition of Mg into the molten steel exhibits the remarkable improvement of toughness and tensile properties.

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Section: Discussionmentioning

confidence: 99%

Effect of Mg Addition on the Characterization of γ-α Phase Transformation During Continuous Cooling in Low Carbon Steel

Min

Liu

et al. 2015

steel research int.

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“…For Al 2 O 3 particle, there are some disagreements on the effects of Al 2 O 3 inclusions on the development of IAF grains. For instance, some investigations proposed that Al 2 O 3 is an anion vacancy type oxide, it is not expected to absorb surrounding Mn atoms. However, the inclusions in their literatures are isolated Al 2 O 3 without a MnS outer skin.…”

Section: Discussionmentioning

confidence: 99%

Study on the Formation of Intragranular Acicular Ferrite in a Zr–Mg–Al Deoxidized Low Carbon Steel

Min

Liu

et al. 2015

steel research int.

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The formation of intragranular acicular ferrite (IAF) in a Zr–Mg–Al deoxidized low carbon steel was investigated by means of dilatometry, thermo‐mechanical controlled processing, and combined these results with metallographical observations. The typical inclusions were characterized by scanning electron microscopy and the chemical composition of the inclusions was determined by energy dispersive spectroscopy. The role of these inclusions on the formation of IAF was discussed. The results indicate that the Al2O3–MgO–ZrO2 and Al2O3–MgO–ZrO2–MnS multiphase particles with 1.5–3.0 μm size can be the effective nuclei of IAF, whereas the Al2O3–MnS inclusions are inert. A Mn–depletion zone is observed adjacent to the Al2O3–MgO–ZrO2–MnS inclusion, which is believed to be one of the possible mechanisms to promote the IAF formation. Through dilatometric tests, for Zr–Mg steel, the IAF structure forms in the cooling rate range of 1–10 °C s−1, and the most appropriate cooling rate for IAF is in the range of 5–10 °C s−1. A fine grained microstructure and an improvement of toughness and tensile properties are obtained after subjecting the steel grade with Zr and Mg additions to a special thermo‐mechanical regime.

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“…These inclusions were found to be inert in the present case, in accordance with most reports in the literature. [5,9,19,40,[43][44][45] 3. Steel C1 Considerable amounts of (Ti,Mn,Al,Si)O x particles were detected in steel C1.…”

Section: Steel B1mentioning

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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Effects of Si and Al on acicular ferrite formation in C-Mn steel

Cited by 33 publications

References 17 publications

Effect of Mg Addition on the Characterization of γ-α Phase Transformation During Continuous Cooling in Low Carbon Steel

Effect of Mg Addition on the Characterization of γ-α Phase Transformation During Continuous Cooling in Low Carbon Steel

Study on the Formation of Intragranular Acicular Ferrite in a Zr–Mg–Al Deoxidized Low Carbon Steel

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

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