Effect of B on the Intra-Granular Ferrite Formation in Ti-Oxides Bearing Steels

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

doi:10.2355/tetsutohagane1955.79.10_1169

Cited by 31 publications

(15 citation statements)

References 6 publications

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“…On the other hand, the introduction and modification of inclusions have also received a great deal of attention as a new technique for improving the mechanical properties of steel. [1][2][3][4][5][6][7][8][9] For instance, since manganese sulfide acts as a heterogeneous nucleation site of intragranular ferrite, it is used for refining the ferritic structure 3,4) and for improving the toughness in the heat-affected zone (HAZ) of the weld metal. 5) Furthermore, it is well-known that MnS inclusion improves the machinability of steels.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9] For instance, since manganese sulfide acts as a heterogeneous nucleation site of intragranular ferrite, it is used for refining the ferritic structure 3,4) and for improving the toughness in the heat-affected zone (HAZ) of the weld metal. 5) Furthermore, it is well-known that MnS inclusion improves the machinability of steels. 6) Although there have been extensive studies on the formation and morphology of MnS in steel, [10][11][12][13][14][15] few studies on the microstructural features of CrS have been performed.…”

Section: Introductionmentioning

confidence: 99%

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Morphology of Sulfide Formed in the Fe-Cr-S Ternary Alloys.

et al. 2002

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The evolution of sulfide morphology in the Fe-(0.3-18)mass%Cr-(0.05-0.3)mass%S alloys during solidification and heat treatment was investigated by means of optical microscopy, scanning electron microscopy, analytical electron microscopy and X-ray diffraction. In situ observation of the formation of the fine particle sulfide was also conducted at elevated temperatures by confocal scanning laser microscopy. The morphology of sulfide in the Fe-Cr-S ternary alloys was found to change from a cell wall type to a globular type with increasing Cr content. Accompanying the phase transformation of the matrix from the d phase to the g phase, two types of transgranular fine particle sulfide were formed. One is a fine spherical sulfide formed from the FeS-rich liquid phase through the remelting reaction of d→gϩLiq. in less than 5 mass% Cr alloys, and the other is a fine rod-like sulfide formed through the eutectoid reaction of d→gϩsulfide in 5 to 13 mass% Cr alloys. The formation mechanism of various types of sulfide morphology was examined based on phase diagram information.KEY WORDS: sulfide morphology; in situ observation; mechanism of sulfide formation; phase diagram; stainless steel.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphology of Sulfide Formed in the Fe-Cr-S Ternary Alloys.

et al. 2002

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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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“…[1][2][3][4] The refinement of their microstructure was shown to be primarily responsible for its improvement and was attributed to a great potential of inclusions for ferrite nucleation. This technology taking use of fine inclusions as a means of ferrite refinement is recently being further explored to seek for a possibility to apply to the structural steels such as hotforging medium carbon steels as a complimentary means to a conventional thermomechanical processing.…”

Section: Introductionmentioning

confidence: 99%

“…This technology taking use of fine inclusions as a means of ferrite refinement is recently being further explored to seek for a possibility to apply to the structural steels such as hotforging medium carbon steels as a complimentary means to a conventional thermomechanical processing. 5,6) The inclusions responsible for ferrite nucleation in low carbon weld steels is frequently observed in a form of compounds composed of oxides, nitrides and MnS 1,2) and of nitrides and MnS, 3) MnS being almost always associated with the ferrite nucleation. This suggested that the MnS is one of the most important inclusions for ferrite nucleation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti Addition on the Potency of MnS for Ferrite Nucleation in C-Mn-V Steels.

Park

Choo

2000

ISIJ International

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The variation of precipitation behavior of MnS has been thermodynamically calculated in V-bearing C-Mn steels by substituting Ti for V. The use of two different set of solubility data for Ti 4 C 2 S 2 and TiS reported in literatures leads to a completely reversed precipitation behavior of MnS. The result of experimental observations is in qualitative agreement with the calculated result using the solubility data of Liu and Jonas. The calculated result showed, contrary to the case of V-containing steel, that the precipitated amount of MnS in steels bearing Ti-only rather decreases with decreasing temperature and that this is due to the formation of Ti 4 C 2 S 2. Controlled cooling experiments with interrupted quenching technique showed that MnS directly acts as the nucleation site for ferrite and that its nucleation potency depends on the precipitation behavior of MnS. Namely, MnS rarely acts as a nucleation site for ferrite in steels where its precipitated amount decreases with decreasing temperature.

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Effect of B on the Intra-Granular Ferrite Formation in Ti-Oxides Bearing Steels

Cited by 31 publications

References 6 publications

Morphology of Sulfide Formed in the Fe-Cr-S Ternary Alloys.

Morphology of Sulfide Formed in the Fe-Cr-S Ternary Alloys.

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

Effect of Ti Addition on the Potency of MnS for Ferrite Nucleation in C-Mn-V Steels.

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