An Integrated Study on the Evolution of Inclusions in EH36 Shipbuilding Steel with Mg Addition: From Casting to Welding

Zou, Xiaodong; Zhao, Dewen; Sun, Jincheng; Wang, Cong; Matsuura, Hiroyuki

doi:10.1007/s11663-017-1163-x

Cited by 106 publications

(47 citation statements)

References 26 publications

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“…Before La addition, as the Mg content in the steel increased, number density of the Mg‐enriched inclusions enhanced and the opportunities for inclusions collision increased. The Mg‐enriched inclusion did not form clusters because of the weak interaction forces among the Mg‐enriched inclusions . Nevertheless, following the addition of La, the La‐enriched inclusion nucleated on Mg‐enriched inclusion and then collided, merged, and developed to the larger inclusion, due to the high surface activity of the La‐enriched inclusion…”

Section: Resultsmentioning

confidence: 99%

“…The Mg-enriched inclusion did not form clusters because of the weak interaction forces among the Mg-enriched inclusions. [28,35] Nevertheless, following the addition of La, the La-enriched inclusion nucleated on Mg-enriched inclusion and then collided, merged, and developed to the larger inclusion, due to the high surface activity of the La-enriched inclusion. [24] 3.2.…”

Section: Inclusions Evolutionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Mg on the Evolution of Inclusions and Formation of Acicular Ferrite in La–Ti‐Treated Steels

Cui

Song

Yang

et al. 2020

steel research int.

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The size distribution and compositions of inclusions and microstructures in steels with different Mg contents are systematically investigated. The results show that Mg treatment modified and refined the inclusions. With Mg addition, the dominant inclusions in the samples evolve from LaAlO3 with MnS to a Mg‐enriched core enwrapped by a La‐enriched shell with MnS. While the Mg content increases from 11 to 66 ppm, the core changes from MgO·Al2O3 to MgO, and the shell develops from LaAlO3 to La2O2S. With the increase in Mg content from 0 to 44 ppm, the number density of effective inclusions is improved, and the proportion of acicular ferrite (AF) increases from 15% to 39%. However, the AF fraction decreases to 16% due to the relatively low amount of effective inclusions in the sample Mg3 with 66 ppm Mg.

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Section: Resultsmentioning

confidence: 99%

Section: Inclusions Evolutionmentioning

confidence: 99%

Effect of Mg on the Evolution of Inclusions and Formation of Acicular Ferrite in La–Ti‐Treated Steels

Cui

Song

Yang

et al. 2020

steel research int.

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“…The pinning force mainly depends on the characteristics of the particles, and abundant of fine and dispersed particles exhibit the strong pinning force and effectively inhibit the growth of austenite grain during welding thermal cycle . Furthermore, the acicular ferrites are also the desired microstructures for grain refinement in the HAZ of steels . The acicular ferrite (AF) plates nucleate on intragranular oxides and grow in multiple directions, which can effectively separate the coarse austenite grain into several small regions.…”

Section: Introductionmentioning

confidence: 99%

In Situ Observation of Grain Refinement in the Simulated Heat‐Affected Zone of Al–Ti‐0.05% Ce‐Deoxidized Steel

Cao

Wan

Hou

et al. 2019

steel research int.

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The particles and microstructural characteristics in the simulated heat‐affected zone (HAZ) of the Al–Ti deoxidized steel with 0.05% Ce treatment are investigated using in situ, optical, and electron microscopes and an electron backscattered diffraction analysis, and compared with the Al–Ti deoxidized steel with Ca treatment. The results reveal that the fine CeAlO3 inclusions and nanoscale (Ti, Nb)N precipitates are formed in the Ce‐bearing steel instead of the Ca–Al oxides surrounded by TiN and nanoscale (Ti, Nb)N precipitates in the Ca‐bearing steel. The nanoscale precipitates with higher density in the Ce‐bearing steel can effectively pin austenite grain boundary, and the finer austenite grain is obtained during the welding thermal cycle. The inclusions in both steels are detrimental to the acicular ferrite nucleation. Thus, the transformation from austenite to bainite occurs actively, and bainite packets with different lengthening directions divide the prior austenite into several small regions at intermediate temperature. The fine‐grained microstructure is obtained in the simulated HAZ of the Ce‐bearing steel due to the pinning effect of finer precipitates with higher density and the formation of the bainite packets with high‐angle grain boundary.

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“…Non-metallic inclusions, such as oxide-or Ti-bearing inclusions, existing in tire cord steel have serious detrimental effects on the drawing performance and fatigue properties. Furthermore, the properties of inclusions, such as size, composition, amount, and morphology, play a key role on the quality of steel [4,5]. At present, the damage problems of brittle oxide inclusions for steel can be better controlled by morphology-controlling technology.…”

Section: Introductionmentioning

confidence: 99%

Understanding TiN Precipitation Behavior during Solidification of SWRH 92A Tire Cord Steel by Selected Thermodynamic Models

et al. 2019

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Tire cord steel is widely used in the tire production process of the vehicle manufacturing industry due to its excellent strength and toughness. Titanium nitride (TiN) inclusion, existing in tire rod, has a seriously detrimental effect on the fatigue and drawing performances of the tire steel. In order to control its amount and morphology, the precipitation behavior of TiN during solidification in SWRH 92A tire cord steel was analyzed by selected thermodynamic models. The calculated results showed that TiN cannot precipitate in the liquid phase region regardless of the selected models. However, the precipitation of TiN in the mushy zone would occur at the final stage during the solidification process (at solid fractions greater than 0.98) if the LRSM (Lever-rule model was applied for the N and Scheil model for Ti) or Ohnaka models (without considering the effect of carbon on secondary dendrite arm spacing (SDAS)) were adopted. For the Ohnaka model, in the case when the effect of carbon on SDAS was considered, TiN would probably precipitate in the solid phase zone rather than precipitate in the liquid phase region or mushy zone.

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An Integrated Study on the Evolution of Inclusions in EH36 Shipbuilding Steel with Mg Addition: From Casting to Welding

Cited by 106 publications

References 26 publications

Effect of Mg on the Evolution of Inclusions and Formation of Acicular Ferrite in La–Ti‐Treated Steels

Effect of Mg on the Evolution of Inclusions and Formation of Acicular Ferrite in La–Ti‐Treated Steels

In Situ Observation of Grain Refinement in the Simulated Heat‐Affected Zone of Al–Ti‐0.05% Ce‐Deoxidized Steel

Understanding TiN Precipitation Behavior during Solidification of SWRH 92A Tire Cord Steel by Selected Thermodynamic Models

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