Mechanism of Notch Toughness Improvement in Weld Metals Containing Ti and B

Mori, Naomichi; Homma, Hiroyuki; Okita, Shigeru; Wakabayashi, Masakuni

doi:10.2207/qjjws1943.50.174

Cited by 42 publications

(21 citation statements)

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“…12,17) Additionally, it has been reported that AF nucleation on TiO is due to the good lattice coherency between TiO and AF. 10,18) According to Yamada et al, a TiO layer formed on the surface of an inclusion particle promotes AF nucleation. The AF satisfies the Baker-Nutting (B-N) orientation relationship with the TiO layer.…”

Section: Introductionmentioning

confidence: 99%

Acicular Ferrite Formation on Ti-Rare Earth Metal-Zr Complex Oxides

2015

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Acicular ferrite (AF) formation potency of Ti-Rare earth metal (REM)-Zr (TRZ) complex oxide has been investigated in the simulated heat affected zone of low carbon steel. The TRZ complex oxide shows higher AF formation potency than Ti and Al oxides. A TRZ oxide particle is composed of REM-rich and Zrrich phases. AF crystals nucleate on the interface between austenite and the Zr-rich oxide phase, having a crystal structure that is face-centered cubic with lattice parameter of 0.44 nm. The Zr-rich phase and AF have an orientation relationship described by (011)AF//(011)Oxide, [100]AF//[ ]Oxide (the AF-TRZ orientation relationship), which allows good lattice coherency. It is suggested that the formation of this orientation relationship promotes AF nucleation on TRZ complex oxides. The AF also satisfies the Kurdjumov-Sachs (K-S) orientation relationship with the austenite matrix. It is considered that the coexistence of the AF-TRZ and K-S "three phase" orientation relationships is caused by variant selection of AF in addition to the formation of a rational orientation relationship between the Zr-rich oxide phase and the austenite matrix during the HAZ thermal cycle.KEY WORDS: heat affected zone; Ti-Rare earth metal-Zr complex oxide; acicular ferrite.

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Section: Introductionmentioning

confidence: 99%

Acicular Ferrite Formation on Ti-Rare Earth Metal-Zr Complex Oxides

2015

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“…This type of weld metal has been the subject of numerous research studies. It is reported that the role of titanium in nucleating acicular ferrite is associated with inclusions containing TiO [1][2][3][4][5][6][7][8], MnOTiO 2 [9], Ti 2 O 3 [10,11] and TiN [12][13][14][15]. According to a lattice disregistry model which takes into account the mismatch between the inclusion surface and ferrite matrix, phases such as TiO, TiO 2 and TiN have low mismatch values, typically 3.0, 8.8 and 3.8 %, respectively, giving effective sites for nucleation of acicular ferrite [5,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of titanium and nitrogen on the transformation characteristics of acicular ferrite in reheated C–Mn steel weld metals

2013

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The nucleation and growth processes of acicular ferrite in C-Mn steel weld metals containing various levels of titanium and nitrogen have been studied using dilatometry combined with transmission electron microscopy associated with energy-dispersive X-ray analysis. The as-deposited weld metals were thermally cycled under continuous cooling conditions, and fully developed and partially transformed microstructures were studied. Results showed that austenite transformed to ferrite in titanium-free C-Mn steel weld metals over a comparatively large range, and the resulting microstructure was dominated by Widmanstatten ferrite. The addition of titanium, typically 410 ppm, to C-Mn steel weld metals was found to accelerate the transformation kinetics, reducing the range in transformation temperature and modifying the weld microstructure with Widmanstatten ferrite being replaced by intragranularly nucleated acicular ferrite. Subsequent additions of nitrogen of around 240 ppm to C-Mn and C-Mn-Ti inhibited the transformation, but this soluble nitrogen had a little effect on weld microstructure. It is concluded that the development of acicular ferrite in C-Mn-Ti-N steel weld metals is associated with TiO-and TiN-type inclusions which act as effective sites for nucleation of acicular ferrite.This finding illustrates the possibility of using nitrogen as a deliberate alloying addition under some circumstances.

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“…Watanabe et al [11] experimentally changed oxygen contents in Ti bearing gas metal arc weld metals and found that Ti oxides effectively nucleate fine intragranular acicular ferrite. Mori et al [12] also proposed that oxide particles having surface coating of TiO or those particles which are wholly TiO would be the most potent site for nucleation of acicular ferrite since disregestry between TiO and ferrite is only three percent.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano Size TiO<sub>2</sub> Particles on Mechanical Properties of AWS E 11018M Type Electrode

Pal¹,

Maity²

2011

MSA

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Mechanism of Notch Toughness Improvement in Weld Metals Containing Ti and B

Cited by 42 publications

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Acicular Ferrite Formation on Ti-Rare Earth Metal-Zr Complex Oxides

Acicular Ferrite Formation on Ti-Rare Earth Metal-Zr Complex Oxides

Effect of titanium and nitrogen on the transformation characteristics of acicular ferrite in reheated C–Mn steel weld metals

Effect of Nano Size TiO<sub>2</sub> Particles on Mechanical Properties of AWS E 11018M Type Electrode

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Mechanism of Notch Toughness Improvement in Weld Metals Containing Ti and B

Cited by 42 publications

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Acicular Ferrite Formation on Ti-Rare Earth Metal-Zr Complex Oxides

Acicular Ferrite Formation on Ti-Rare Earth Metal-Zr Complex Oxides

Effect of titanium and nitrogen on the transformation characteristics of acicular ferrite in reheated C–Mn steel weld metals

Effect of Nano Size TiO&lt;sub&gt;2&lt;/sub&gt; Particles on Mechanical Properties of AWS E 11018M Type Electrode

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Effect of Nano Size TiO<sub>2</sub> Particles on Mechanical Properties of AWS E 11018M Type Electrode