Formation mechanism of surface cracks and subsurface cracks in SAE1548: Medium carbon sulfur-containing V-N micro-alloyed bloom

Lü, Xing; Bao, Yanping; Wang, Min; Yang, Jianhong

doi:10.1016/j.engfailanal.2022.106760

Cited by 8 publications

(2 citation statements)

References 43 publications

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“…[4][5][6] Generally, it is suggested that cracks in sulfur-containing steel are initiated by MnS inclusions and ferrite. [7][8][9][10][11][12][13][14] Thus, quality improvements especially the controlment of sulfides in sulfur-containing steels are necessary to ensure the elevated needs of consumer expectations.…”

Section: Introductionmentioning

confidence: 99%

Precipitation Characteristic of Sulfide in Medium‐Carbon Sulfur‐Containing Steel

Wang

et al. 2023

steel research int.

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Herein, the precipitation characteristic of sulfide is investigated by confocal laser scanning microscopy for a typical medium‐carbon sulfur‐containing 42CrMo steel under different cooling rates (100, 200, 600 °C min−1) and sulfur contents (0.0018 and 0.0249 wt%). Thermodynamic calculations show that increasing sulfur content can enlarge the liquid–solid‐phase zone and enhance the initial precipitation temperature of MnS in 42CrMo steel. Phase diagram of Mn–Mo–S demonstrates that the sulfides contain Mn, Mo, and S elements can be formed. The experimental results indicate that with an increase of the sulfur content from 0.0018 to 0.0249 wt%, more (Mn, Mo)S sulfides are formed in the steel due to the significant enhancement of supersaturation. Moreover, it is revealed that the average size of (Mn, Mo)S inclusions decreases from 16.11 to 3.55 μm when the cooling rate increases from 100 to 600 °C min−1. The typical of large‐size rodlike (Mn, Mo)S inclusions is observed in a low cooling rates of 100–200 °C min−1. As the cooling rate increases to 600 °C min−1, smaller globular (Mn, Mo)S inclusions with an average size of 3.55 μm are appeared which can act as a core to promote the ferrite formation.

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Section: Introductionmentioning

confidence: 99%

Precipitation Characteristic of Sulfide in Medium‐Carbon Sulfur‐Containing Steel

Wang

et al. 2023

steel research int.

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confidence: 99%

Effect of electromagnetic stirrer centered outside the mold on steel flow field of bloom continuous casting

Xing,

Bao,

Wang

et al. 2023

China Foundry

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Most of the surface and sub-surface defects in continuous casting blooms are generated in the mold [1][2][3] . The flow and solidification of the molten steel in the mold have an important impact on the quality of the billet/slab [4][5][6] . Electromagnetic stirring has become the most promising technology to change the steel flow in the mold and is widely used in the billet continuous casting process [7,8] . Electromagnetic stirring in the mold facilitates the removal of inclusions and porosity, promotes superheat dissipation, improves segregation of alloying elements, and helps to break up columnar dendritic grains to form a fine equiaxed grain structure [9,10] .

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Effect of Sulfur Content on Precipitation Behavior of Dendrite Sulfide Inclusion in Continuous Casted 20CrMnTi Gear Steel

Zheng,

Gao,

Zhang

2024

steel research int.

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The effect of sulfur content on sulfide inclusion and dendrite MnS in continuous casted 20CrMnTi gear steel is investigated. There are two main types of sulfides in 20CrMnTi steel: pure MnS and TiN–MnS composite inclusions. The number of TiN–MnS is higher than MnS, especially in the edge of the billet. TiN–MnS is smaller both in area and size than pure MnS. The statistical results of dendrite MnS show that the increase of S content decreases the average size of sulfides, whereas raises the number and the maximum size of sulfides. With the S content increasing, the proportion of large‐sized dendrite MnS in steel decreases, but the amount of large‐sized dendrite MnS increases, which results in the increase of number of large‐sized dendrite MnS. The average area of dendrite MnS inclusions first increased and then decreased from the edge to the center of billet, and the maximum area appeared at about 1/2 radius of the billet. Comparison with the microstructure of the two billets, the proportion of ferrite increased with the increase of S content.

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Formation mechanism of surface cracks and subsurface cracks in SAE1548: Medium carbon sulfur-containing V-N micro-alloyed bloom

Cited by 8 publications

References 43 publications

Precipitation Characteristic of Sulfide in Medium‐Carbon Sulfur‐Containing Steel

Precipitation Characteristic of Sulfide in Medium‐Carbon Sulfur‐Containing Steel

Effect of electromagnetic stirrer centered outside the mold on steel flow field of bloom continuous casting

Effect of Sulfur Content on Precipitation Behavior of Dendrite Sulfide Inclusion in Continuous Casted 20CrMnTi Gear Steel

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