Effect of austenitizing temperature on microstructure in 16Mn steel treated by cerium

Wen, Bin; Song, Bo; Pan, Ning; Hu, Qiongyi; Mao, Jinghong

doi:10.1007/s12613-011-0491-0

Cited by 18 publications

(10 citation statements)

References 14 publications

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“…Nonmetallic oxides have been considered being harmful to the ductility, toughness, and fatigability of steel because of their high melting point and hardness [1]. However, in 1990, the technology of oxide metallurgy was proposed to utilize the positive effect of the fine oxide to refine the grain [2][3][4]. Due to the perspective prospect, this technology has been a subject of intense study.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…AF tends to nucleate on the inclusions with low lattice mismatch against α-Fe. The lattice mismatch of TiN, MgO•Al 2 O 3 , MgO, CeAlO 3 and Ce 2 O 2 S with α-Fe were 3.9% [29], 0.6% [30], 4.0% [13], 7.25% [20] and 1.9% [31], respectively, which were in favor of AF nucleation. However, the lattice mismatch between MnS and α-Fe was 8.9% [30], causing pure MnS to not act as the nucleus of AF nucleation.…”

Section: Composition Size and Number Density Of Effective Inclusionsmentioning

confidence: 93%

Effect of Cerium Content on the Evolution of Inclusions and Formation of Acicular Ferrite in Ti-Mg-Killed EH36 Steel

Liu

Song

Yang

et al. 2020

Metals

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Ce has been widely used in oxide metallurgy for modifying inclusions and refining microstructure. Effect of Ce contents on the evolution and characteristics of non-metallic inclusions and the formation of acicular ferrite (AF) in Ce-treated Ti-Mg-killed EH36 steel was investigated. The results showed that the main type of inclusions in Ti-Mg deoxidized steel was MgO·Al2O3-MnS. After 0.014%, 0.024% and 0.037% Ce were added into the steels, dominant inclusions became CeAlO3-MgO-MnS, Ce2O2S-MgO-MnS and Ce2O2S-MnS, respectively. The precipitation of pure MnS was suppressed in the steel with 0.024% Ce, while the number density of total inclusions increased significantly in the steel with 0.037% Ce, causing the inclusions distributing densely. Ce addition refined the microstructure of tested steels by promoting AF formation and polygonal ferrite distributing evenly. Dispersive distribution, low lattice mismatch against α-Fe, as well as lower number density of pure MnS caused the highest number density of effective inclusions (nucleus of AF formation) in 0.024% Ce-treated steel.

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“…The low mismatch mechanism means studying the lattice structure matching degree between non-metallic inclusions and α-Fe, and it is conducive to the reduction of interface energy and stress energy required for ferrite nucleation with a high matching degree [67]. For example, the mismatches between Ce 2 O 3 , Ce 2 O 2 S, CeAlO 3 , and α-Fe are only 4.1%, 1.2%, and 7.0%, respectively, so that they all have the chance to effectively induce the particles of AF [68]. Thus, the possibility of ferrite nucleation induced by inclusions can be explained theoretically by calculating the mismatches between different inclusions and α-Fe.…”

Section: Development Of Re Oxide Metallurgy Technologymentioning

confidence: 99%

Oxide Metallurgy Technology in High Strength Steel: A Review

et al. 2022

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Oxide metallurgy technology plays an important role in inclusion control and is also applied to improve the weldability of high strength steel. Based on the requirements of the weldability in high strength steel, the influencing factors of weld heat affected zone (HAZ) as well as the development and application status of oxide metallurgy technology are summarized in this review. Moreover, the advantages and difficulties in the application of rare earth (RE) oxide metallurgy technology are analyzed, combined with the performance mechanism of RE and its formation characteristics of fine and high melting point RE inclusions with distribution dispersed in liquid steel. With the weldability diversities of different high strength steels, the research status of weldability of high strength steel with high carbon equivalent and the effects of RE on the microstructure and properties of HAZ are discussed, and some suggestions about further research in the future are proposed.

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Effect of austenitizing temperature on microstructure in 16Mn steel treated by cerium

Cited by 18 publications

References 14 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

Effect of Cerium Content on the Evolution of Inclusions and Formation of Acicular Ferrite in Ti-Mg-Killed EH36 Steel

Oxide Metallurgy Technology in High Strength Steel: A Review

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