Precipitation of AlN and MnS in Low Carbon Aluminium-Killed Steel

Chen, Yinli; Wang, Yan; Zhang, Aimin

doi:10.1016/s1006-706x(12)60087-9

Cited by 41 publications

(22 citation statements)

References 12 publications

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“…According to the precipitation-time-temperature (PTT) diagram of AlN [23], the AlN precipitation should have been completed below 1073 K in the current steel during the annealing process. Therefore, the AlN particles within the specimens quenched from 1073 K (ferrite + austenite two phase region) were examined.…”

Section: The Evolution Of Aln Precipitatesmentioning

confidence: 99%

Effect of Cold-Deformation on Austenite Grain Growth Behavior in Solution-Treated Low Alloy Steel

Zhang

Matsuura

Ohno

2018

Metals

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The occurrence of abnormal grain growth (AGG) of austenite during annealing is a serious problem in steels with carbide and/or nitride particles, which should be avoided from a viewpoint of mechanical properties. The effects of cold deformation prior to annealing on the occurrence of AGG have been investigated. It was found that the temperature range of the occurrence of AGG is shifted toward a low temperature region by cold deformation, and that the shift increases with the increase of the reduction ratio. The lowered AGG occurrence temperature is attributed to the fine and near-equilibrium AlN particles that are precipitated in the cold-deformed steel, which is readily dissolved during annealing. In contrast, coarse and non-equilibrium AlN particles precipitated in the undeformed steel, which is resistant to dissolution during annealing.

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Section: The Evolution Of Aln Precipitatesmentioning

confidence: 99%

Effect of Cold-Deformation on Austenite Grain Growth Behavior in Solution-Treated Low Alloy Steel

Zhang

Matsuura

Ohno

2018

Metals

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“…MnS is generally generated from the residual liquid steel with the enrichment of manganese and sulfur during the solidification procedure. Mathematical modeling is an important tool to investigate the formation of MnS, and several models have been proposed and developed to describe the formation process of MnS by previous studies [11][12][13][14][15][16][17]. In this paper, the direct observation of precipita-tion process of sulfides during solidification was investigated by using a high-temperature confocal laser scanning microscope.…”

Section: Introductionmentioning

confidence: 99%

Study of manganese sulfide precipitation in medium sulfur, non-quenched and tempered steel via experiments and thermodynamic calculation

Liu

et al. 2018

Metall. Res. Technol.

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In this study, the precipitation behavior of MnS was calculated during the solidification process of the medium sulfur, non-quenched and tempered 49 MnVS steel. And the precipitation process was directly observed by a high-temperature confocal laser scanning microscope (HT-CLSM) equipped with a gold-image furnace. Besides, the precipitated particles were proved to be MnS by using the Scanning Electron Microscope-Energy Dispersive spectroscopy (SEM-EDS) analysis. The modified thermodynamic calculation indicated that the MnS precipitated from the residual liquid steel when the product of manganese and sulfur concentrations exceeded the equilibrium value at 1417.0 °C. Meanwhile, the results calculated by FactSage software shown that the beginning precipitation temperature of MnS is about 1411.0 °C. The observation of HT-CLSM demonstrated that the primary solid on the free surface of the liquid steel was visualized at 1485.0 °C during the solidification process (cooled from 1520.0 °C to room temperature with a rate of −30 °C/min). Then, the MnS particles started to form at 1437.0 °C and rapidly grew up into shape on the solid-liquid boundary. And the precipitation of MnS continued to form in a large amount (90% of the total) in the next 10 degrees. The enrichment of Mn and S near the local melt surface may be conducive the MnS formation, which results a higher actual precipitation temperature than the calculated value.

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“…It should be noted that in the EDS spectra, the peaks of Cu and C are partly or completely due to the copper grid and the carbon replica. So, those are neglected in addition to the EDS peaks resulting from the preparation process such as O, S, and Fe …”

Section: Resultsmentioning

confidence: 99%

Characterization of the Microstructure and Precipitates Formed During the Thermomechanical Processing of a CrNiMoWMnV Ultrahigh‐Strength Steel

Ali

Porter

Kömi

et al. 2020

steel research int.

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The effect of total applied strain (TAS), finish forging temperature (FFT) on the microstructure, and precipitation kinetics of a newly developed low‐cost, low‐alloy CrNiMoWMnV ultrahigh‐strength steel has been investigated. A Gleeble 3800 thermomechanical simulator is used to simulate the hot forging process and its influence on the precipitation kinetics. Field‐emission scanning electron microscopy combined with electron‐backscattered diffraction is used to characterize the final overall microstructures, whereas transmission electron microscopy on carbon extraction replicas is used to characterize the precipitates in terms of morphology, size distribution, mean equivalent circle diameter, the 90th percentile in the cumulative diameter distribution (D90%ppt), chemical composition, and crystallography. Thermo‐Calc software is used to predict the precipitates expected in austenite at equilibrium. The final microstructure consists of lath martensite and a small fraction of the precipitates AlN, TiN, and composite TiN–AlN. Differences in the degree of strain‐induced precipitation caused by variations in TAS and FFT have been shown to greatly influence precipitate size distributions. Variations in the degree of precipitate dissolution and coarsening cause variations in the prior austenite grain size, which subsequently cause variations in the effective grain size of the final microstructure, i.e., that are defined by high‐angle grain boundaries.

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Precipitation of AlN and MnS in Low Carbon Aluminium-Killed Steel

Cited by 41 publications

References 12 publications

Effect of Cold-Deformation on Austenite Grain Growth Behavior in Solution-Treated Low Alloy Steel

Effect of Cold-Deformation on Austenite Grain Growth Behavior in Solution-Treated Low Alloy Steel

Study of manganese sulfide precipitation in medium sulfur, non-quenched and tempered steel via experiments and thermodynamic calculation

Characterization of the Microstructure and Precipitates Formed During the Thermomechanical Processing of a CrNiMoWMnV Ultrahigh‐Strength Steel

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