Effect of Cooling Rate on Composition of Oxides Precipitated during Solidification of Steels.

Goto, Hiroki; Miyazawa, Ken-ichi; Yamada, Wataru; Tanaka, Kazuaki

doi:10.2355/isijinternational.35.708

Cited by 94 publications

(78 citation statements)

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“…The spatial number density of inclusions given in Table 3 was obtained from measured area number density using DeHoff's equations. 32) As revealed in the area number density plot in Fig. 6, values of spatial number density of inclusions in water quenched-steels are about ten times greater than those in furnace-cooled steels.…”

Section: Size Of Primary and Secondary Inclusionsmentioning

confidence: 93%

Evolution of Size, Composition, and Morphology of Primary and Secondary Inclusions in Si/Mn and Si/Mn/Ti Deoxidized Steels.

Kim

Lee

2002

ISIJ International

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Primary and secondary inclusions in Si/Mn and Si/Mn/Ti deoxidized structural steels subjected to different thermal histories were investigated in view of evolution of size, composition, and morphology. Primary inclusions quenched from 1 600°C contained very low levels of sulfur, and hence MnS precipitation on them was hardly found. The mean diameter of secondary inclusions lied in the range of 1-3 mm depending on the cooling rate and chemical compositions of steels. Both MnO and MnS content were higher in smaller secondary inclusions. MnS which precipitated on manganese silicate inclusions in Si/Mn deoxidized steels mostly grew into the inclusions. As inclusion size increased, the number of MnS precipitates on each inclusion was also increased. Titanium in steel had a tendency to reduce SiO 2 content in inclusions and to associate with MnO in the inclusions to form a stoichiometric relationship of Mn/Ti ratio in the inclusions. If Ti content in Si/Mn/Ti deoxidized steels was low, the secondary inclusions were found to form with multiple phases; viz., manganese silicate phase, Mn-Ti oxide phase, and MnS phase. The MnS phase always precipitated in the manganese silicate phase. The proportion of manganese silicate phase in each inclusion decreased with a corresponding increase in Ti content in the steel, and eventually disappeared completely when the Ti content exceeded a certain level (70 ppm in the present steel compositions). In this case MnS was found to precipitate outside Mn-Ti oxide inclusions and grew into the steel matrix. In order to interpret and predict the behavior of inclusion precipitation and growth, a model has been developed which incorporates both thermodynamic and kinetic considerations.

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Section: Size Of Primary and Secondary Inclusionsmentioning

confidence: 93%

Evolution of Size, Composition, and Morphology of Primary and Secondary Inclusions in Si/Mn and Si/Mn/Ti Deoxidized Steels.

Kim

Lee

2002

ISIJ International

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“…Goto et al [111][112][113] described a coupled model of oxide growth and microsegregation for studying the precipitations during solidification as described in Figure 8. In the model, Equation (31) was applied to estimate the growth of oxides and the Ohnaka Model [26] was used to predict solute enrichment in the residual liquid.…”

Section: During Solidificationmentioning

confidence: 99%

Modeling Inclusion Formation during Solidification of Steel: A Review

You

Michelic

Presoly

et al. 2017

Metals

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Abstract:The formation of nonmetallic inclusions in the solidification process can essentially influence the properties of steels. Computational simulation provides an effective and valuable method to study the process due to the difficulty of online investigation. This paper reviews the modeling work of inclusion formation during the solidification of steel. Microsegregation and inclusion formation thermodynamics and kinetics are first introduced, which are the fundamentals to simulate the phenomenon in the solidification process. Next, the thermodynamic and kinetic models coupled with microsegregation dedicated to inclusion formation are briefly described and summarized before the development and future expectations are discussed.

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“…6,63,64,69,[75][76][77][78][79] More specifically, Mills et al 75) found that TiO could nucleate AF due to it has a low misfit with a and also because of its simple orientation relationship. Also, Babu et al 76) showed that titanium-rich inclusions accelerated kinetics of AF formation in the weld metal.…”

Section: Oxidesmentioning

confidence: 99%

On the Role of Non-metallic Inclusions in the Nucleation of Acicular Ferrite in Steels

2009

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The effects of non-metallic inclusions in nucleating acicular ferrite in steels during cooling from a weld or cooling from an austenitic temperature are reviewed. The influence of the acicular ferrite (AF) structure on mechanical properties of steels such as strength and toughness is briefly mentioned. The different factors affecting the formation of acicular ferrite, such as the soluble content of alloying elements in steel, cooling rate from austenitizing temperature, austenite grain size and inclusion characteristics in steel, are discussed. The mechanisms of acicular ferrite formation on non-metallic inclusions, such as reduction of interfacial energy, mismatch strain between the inclusion and ferrite/austenite, thermal strains at the inclusions and changes in matrix composition near the inclusions are also discussed. Finally, the effects of inclusion characteristics, such as size, number and composition are described and their effectiveness in nucleating acicular ferrite is discussed.KEY WORDS: non-metallic inclusions, intragranular acicular ferrite formation, strength and toughness, steel. 1063

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Effect of Cooling Rate on Composition of Oxides Precipitated during Solidification of Steels.

Cited by 94 publications

References 0 publications

Evolution of Size, Composition, and Morphology of Primary and Secondary Inclusions in Si/Mn and Si/Mn/Ti Deoxidized Steels.

Evolution of Size, Composition, and Morphology of Primary and Secondary Inclusions in Si/Mn and Si/Mn/Ti Deoxidized Steels.

Modeling Inclusion Formation during Solidification of Steel: A Review

On the Role of Non-metallic Inclusions in the Nucleation of Acicular Ferrite in Steels

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