Effect of TiN Size on Ferrite Nucleation on TiN in Low-C Steel

Morikage, Yasushi; Oi, Kenji; Kawabata, Fumimaru; Amano, Keniti

doi:10.2355/tetsutohagane1955.84.7_510

Cited by 27 publications

(11 citation statements)

References 7 publications

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“…[1][2][3] Even though the heavy deformation of super-cooled austenite followed by accelerated cooling has been generally accepted as an effective way of producing ultrafine grained steels, other approaches that exploit the fine precipitates dispersed at both the grain boundaries and in the matrix as ferrite nucleation sites have also been attempted. [4][5][6] Ishikawa et al 7) showed that vanadium nitride (VN) particles, which precipitated at the austenite grain boundaries, enhance ferrite nucleation and induce a random distribution of the ferrite orientation. Furuhara et al 8) also showed that the orientation of the intragranular ferrites, which nucleated at the compound precipitates composed of manganese sulfide and vanadium nitride, deviates from the KurdjumovSachs (K-S) orientation relationship.…”

Section: Introductionmentioning

confidence: 99%

Orientation Distribution of Proeutectoid Ferrite Nucleated at Prior Austenite Grain Boundaries in Vanadium-added Steel.

Cho¹,

Suh²,

Kang³

et al. 2002

ISIJ International

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Section: Introductionmentioning

confidence: 99%

Orientation Distribution of Proeutectoid Ferrite Nucleated at Prior Austenite Grain Boundaries in Vanadium-added Steel.

Cho¹,

Suh²,

Kang³

et al. 2002

ISIJ International

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“…-17 J Both ΔG*3 and ΔG*4 values are smaller than Morikage's calculation for AF nucleation on TiN. 37) In particular, the observation that ΔG*4 is the lowest value for the assumed potential nucleation events indicates that formation of the MTO-A, B-N, and K-S orientation relationships are effective for the AF nucleation. Thus, it is considered that the formation of the MTO-A orientation relationship would permit both the B-N and K-S orientation relationships and result in enhancement of AF nucleation, though the formation of the MTO-A orientation relationship itself has a negative effect on AF nucleation.…”

Section: Formation Mechanism Of Afmentioning

confidence: 53%

Crystal Orientation Relationships between Acicular Ferrite, Oxide, and the Austenite Matrix

et al. 2014

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Crystal orientation relationships between acicular ferrite (AF), oxide and the austenite matrix have been investigated in low carbon steel weld by the submerged arc welding process. In particular, this study focused on the formation mechanism of the crystal orientation relationships. The AF microstructure was observed in weld metal containing titanium. Oxide particles were composed of MnTi2O4, amorphous phase and TiO2. The AF nucleated on MnTi2O4 having the Baker-Nutting (B-N) orientation relationship with the MnTi2O4 and Kurdjumov-Sachs (K-S) orientation relationship with the austenite matrix. This result implies that the MnTi2O4 had a rational orientation relationship with the austenite matrix. The orientation relationship is considered to be (001)MnTi2O4//( 11)γ, [100]MnTi2O4//[211]γ from the viewpoint of the lattice coherency. It is supposed that the MnTi2O4 can be formed within oxide particles having this orientation relationship with the austenite matrix at high temperature during welding process. This mechanism allows the coexistence of both B-N and K-S orientation relationships, which lowers the AF/MnTi2O4 and AF/austenite interfacial energies. This results in the decrease of the activation energy for AF nucleation.KEY WORDS: acicular ferrite; weld metal; Mn-Ti oxide.

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“…Early reports 20) showed that the minimum diameter of TiN particles needed to nucleate intragranular ferrite in low carbon steels was approximately 200 nm and the increase in the number of inclusions promotes the formation of intragranu- lar ferrite due to increasing intragranular inclusion surface area. Also, Oh et al 21) reported that the critical prior austenite grain size for stable formation of intragranular ferrite should be larger than 100 µm and the fraction of intragranular ferrite increased with increasing prior austenite grain size up to 350 µm.…”

Section: Effects Of Titanium and Oxygen Content On Microstructuresmentioning

confidence: 99%

Effects of Titanium and Oxygen Content on Microstructure in Low Carbon Steels

Lee

2002

Mater. Trans.

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The effects of the titanium and oxygen concentration on the characteristics of inclusions and microstructure in low carbon wrought steels were investigated. Increasing the titanium concentration from 48 to 120 ppm promoted the formation of TiN particles and decreased the prior austenite grain size. The fraction of intragranular ferrite in the microstructure was relatively unchanged. When the oxygen concentration was increased from 50 to 130 ppm, the volume fraction and the number of inclusion increased. However, the fraction of intragranular ferrite in microstructures decreased abruptly above 80 ppm because the allotriomorph ferrite phase at the prior austenite grain boundary began to form.

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Effect of TiN Size on Ferrite Nucleation on TiN in Low-C Steel

Cited by 27 publications

References 7 publications

Orientation Distribution of Proeutectoid Ferrite Nucleated at Prior Austenite Grain Boundaries in Vanadium-added Steel.

Orientation Distribution of Proeutectoid Ferrite Nucleated at Prior Austenite Grain Boundaries in Vanadium-added Steel.

Crystal Orientation Relationships between Acicular Ferrite, Oxide, and the Austenite Matrix

Effects of Titanium and Oxygen Content on Microstructure in Low Carbon Steels

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