Effect of Boron on Intra-granular Ferrite Formation in Ti-Oxide Bearing Steels.

Yamamoto, Kohichi; Hasegawa, Toshiei; Takamura, Jin-ichi

doi:10.2355/isijinternational.36.80

Cited by 185 publications

(134 citation statements)

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“…55 (2015), No. 3 sidered to be stimulated by (a) the solute depletion in the vicinity of non-metallic inclusions, [16][17][18] (b) the reduced interfacial energy between austenite and ferrite, 19) (c) the thermal strain energy due to different thermal contraction, 19) and (d) the provision of an inert surface. 20) In the present work, the precipitation of MnS took place on the pre-formed ZrO2 because MnS and ZrO2 have two exactly the same and one very similar interplanar distances.…”

Section: The Nucleation and Growth Of Acicular Ferritementioning

confidence: 99%

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In-situ Observations of Acicular Ferrite Growth Behavior in the Simulated Coarse-grained Heat-affected Zone of High-strength Low-alloy Steels

Wan

Cheng

et al. 2015

ISIJ Int.

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The formation of acicular ferrite in the simulated heat-affected zone of high-strength low-alloy steels was investigated by means of in-situ observation. The acicular ferrite laths or plates were nucleated on intragranular Zr-Ti complex oxides in big austenite grains and then lengthened very fast. The growth of individual acicular ferrite lath or plate was completed in a very narrow temperature range, especially at low temperatures. The measured lengthening rates of ferrite laths or plates were ranged from 33.3 μm/s to 190.5 μm/s, which fell between limit calculated assuming para-equilibrium and negligible-partition local equilibrium modes from the semi-empirical equation proposed by Hillert.

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Section: The Nucleation and Growth Of Acicular Ferritementioning

confidence: 99%

“…9,10) Extensive work has been carried out on the nucleation of acicular ferrite. [11][12][13][14][15][16][17][18][19][20][21][22][23] Therefore, the present work focused on the growth behavior of acicular ferrite using in-situ observation in conjunction with thermodynamic calculations.…”

Section: Introductionmentioning

confidence: 99%

In-situ Observations of Acicular Ferrite Growth Behavior in the Simulated Coarse-grained Heat-affected Zone of High-strength Low-alloy Steels

Wan

Cheng

et al. 2015

ISIJ Int.

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“…TiN, BN and MnS precipitated on Ti 2 O 3 or TiO are examples of favorable nucleation sites for ferrite. [30][31][32] It was also reported that multiple precipitates such as VN or V 4 C 3 precipitation on MnS precipitated on an oxide are effective nucleation sites for ferrite. There is another report that TiN itself without the help of oxides acts as an effective nucleation site for ferrite transformation.…”

Section: Oxide Metallurgymentioning

confidence: 99%

Present Status of and Future Prospects for Precipitation Research in the Steel Industry.

Senuma

2002

ISIJ International

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Precipitation is one of the most important phenomena for controlling the properties of steel. Therefore, numerous studies have been performed in this field. Since 1998, the ISIJ has held a research workshop on precipitation control consisting of around forty members from academia and industry. This workshop held a seminar in autumn 2001 in which some of the workshop members, most of whom were from academia surveyed the present status of precipitation research from an academic viewpoint. In this connection, a review of the present status and future prospects of precipitation research in the steel industry was requested so that an understanding as to how precipitation control was applied in practice could be obtained.This paper is a modified English version of said Japanese review and the recent industrial research on the precipitation control in steel sheets is reviewed and the resultant new products are introduced.KEY WORDS: precipitation; control; recrystallization; transformation; mechanical properties; steel sheet; oxide metallurgy. Fig. 1. Influence of the size of precipitates on the precipitation strengthening based on the Orowan mechanism and the cutting mechanism (schematic).

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“…© 2011 ISIJ efficient in nucleating acicular ferrite, because during cooling the Ti2O3 particles act as substrates for precipitation of TiN and MnS. 24) Nucleation is enhanced by an increase in the thermodynamic driving force for nucleation through manganese depletion of the austenite matrix local to the inclusion. Such a local depletion zone due to MnS precipitation stabilizes the ferrite phase over the parent austenite, thus causing nucleation of IGF.…”

Section: Oxide Compositionmentioning

confidence: 99%

Influence of Oxide Particles and Residual Elements on Microstructure and Toughness in the Heat-Affected Zone of Low-Carbon Steel Deoxidized with Ti and Zr

Suito

Karasev

Hamada³

et al. 2011

ISIJ Int.

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The microstructure and toughness in Fe-0.04%C-1.85%Mn-0.03%Si-0.018%Nb steel deoxidized with Ti and Zr have been studied as functions of particle characteristics, austenite grain size and soluble Ti and Zr contents using a simulated HAZ (heat affected zone) thermal cycle (peak temperature, 1 400°C; peak holding time, 60 s; time of cooling from 800 to 500°C, 70 s) and submerged arc welding (heat input of 15 kJ/mm), respectively. Microstructures were studied in samples containing 1.0 to 1.5 μm-diameter oxide particles numbering 500 to 2 000 mm -2 and with a soluble oxygen content of 10 to 30 ppm (measured before casting) and soluble Ti and Zr contents of 50-150 ppm. The γ grain size after HAZ thermal cycle in the range between 200 and 600 μm is controlled by pinning and solute drag. Small γ grain size below 300 μm was obtained with high soluble Ti and Zr contents of 110-160 ppm, whereas large γ grain size above 300 μm was obtained with low soluble Ti and Zr contents of 60-110 ppm. Two types of microstructures that showed high Charpy absorbed energy (VE(-10°C)= 150-250 J and VE(-50°C)= 50-150 J) were observed independent of γ grain size: One is acicular ferrite and a small amount of grain boundary ferrite (GBF) and ferrite side plate (FSP) and the other is GBF, FSP and granular bainitic ferrite. It was observed that low VE(T) values are attributed to the formation of porosity, large-size particles, carbides (+nitrides) and lathe bainitic ferrite.

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Effect of Boron on Intra-granular Ferrite Formation in Ti-Oxide Bearing Steels.

Cited by 185 publications

References 0 publications

In-situ Observations of Acicular Ferrite Growth Behavior in the Simulated Coarse-grained Heat-affected Zone of High-strength Low-alloy Steels

In-situ Observations of Acicular Ferrite Growth Behavior in the Simulated Coarse-grained Heat-affected Zone of High-strength Low-alloy Steels

Present Status of and Future Prospects for Precipitation Research in the Steel Industry.

Influence of Oxide Particles and Residual Elements on Microstructure and Toughness in the Heat-Affected Zone of Low-Carbon Steel Deoxidized with Ti and Zr

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