Nature of inclusions in steel weld metals and their influence on formation of acicular ferrite

Mills, A. R.; Thewlis, G.; Whiteman, J. A.

doi:10.1179/026708387790329333

Cited by 140 publications

(67 citation statements)

References 2 publications

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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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Section: Oxidesmentioning

confidence: 99%

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

2009

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“…[4][5][6] Many studies have been done to identify oxides that promote AF formation and to establish the mechanism of AF nucleation. [7][8][9][10][11][12][13][14] It is well known that Ti oxides have a positive influence on AF nucleation. 10,12,13,15,16) Researchers have pointed out that Ti2O3 incorporates Mn and forms a Mn depleted zone around the oxide, which increases the driving force for decomposition of the surrounding austenite matrix during cooling.…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9][10][11][12][13][14] It is well known that Ti oxides have a positive influence on AF nucleation. 10,12,13,15,16) Researchers have pointed out that Ti2O3 incorporates Mn and forms a Mn depleted zone around the oxide, which increases the driving force for decomposition of the surrounding austenite matrix during cooling. 12,17) Additionally, it has been reported that AF nucleation on TiO is due to the good lattice coherency between TiO and AF.…”

Section: Introductionmentioning

confidence: 99%

“…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%

“…It is revealed that MnTi2O4 and MnAlO4 are good nucleation sites for AF from the viewpoint of lattice coherency. 10,21,22) However, AF nucleation on complex oxides is still incompletely understood. The purpose of this paper is to investigate the influence of complex oxides on the formation of AF in simulated HAZ microstructures of low carbon steel.…”

Section: Introductionmentioning

confidence: 99%

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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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Structure‐Property Relationships in Steels

Pickering

2006

Materials Science and Technology

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Nature of inclusions in steel weld metals and their influence on formation of acicular ferrite

Cited by 140 publications

References 2 publications

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

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

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

Structure‐Property Relationships in Steels

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