Factors influencing as-deposited strength, microstructure, and toughness of manual metal arc welds suitable for C-Mn steel fabrications

Abson, D. J.; Pargeter, Richard J.

doi:10.1179/095066086790324302

Cited by 43 publications

(37 citation statements)

References 3 publications

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“…The acicular ferrite arises when the low-carbon steel is cooled from the austenitic state at a rapid rate, to suppress the formation of GBA, WF and massive ferrite. [6][7][8][9][10][11][12][13] It is also a common constituent in several welded low-carbon steels. The rate of transformation is much higher than the formation of GBA or WF, but is lower than that for martensitic transformation.…”

Section: Effect Of Acicular Ferrite On Mechanical Properties Of Steelsmentioning

confidence: 99%

“…This has basically been obtained by developing the acicular ferrite (AF) structures and several reviews have earlier been written on this subject. [6][7][8][9][10][11][12][13] Considerable information is now gathered on the role of individual impurity elements (S, O, and N mainly) and their interactions with alloying elements such as Mn, Al, Si, Ti, and Ce in obtaining fine microstructures. There is now considerable enthusiasm to extend these principles to the development of wrought steels with better mechanical properties through development of fine-grained AF structures.…”

Section: Introductionmentioning

confidence: 99%

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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: Effect Of Acicular Ferrite On Mechanical Properties Of Steelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2009

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“…[7][8][9][10]14,56,57) However, there is a need to develop models to describe the competition between the acicular ferrite and bainite reactions. The bainite and acicular ferrite form by similar transformation mechanisms except for the nucleation sites.…”

Section: Competition Between Bainite and Acicular Ferrite Formationmentioning

confidence: 99%

“…[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] Based on these research, it is possible to design welding consumables that maximize the formation of acicular ferrite in welds and thereby obtain better strength and toughness. However, the extension of this knowledge to a wide variety of welding processes, consumable compositions, and shielding gases still eludes welding metallurgist due to the complex interactions between inclu-sion formation, solidification, and solid-state transformations.…”

Section: Introductionmentioning

confidence: 99%

Inclusion Formation and Microstructure Evolution in Low Alloy Steel Welds.

Babu

David

2002

ISIJ International

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The paper presents an overview of research performed at Oak Ridge National Laboratory on inclusion-formation, weld-solidification, and solid-state transformations in low-alloy steel welds. The competition between oxide and nitride formation in Fe-C-Al-Mn self-shielded flux-cored arc steel welds was predicted using computational thermodynamics. Nonequilibrium austenite phase selection was monitored in a Fe-CAl-Mn weld using an in situ time-resolved X-ray diffraction technique. The competition between acicular ferrite and bainite formation from austenite was evaluated in Fe-C-Mn steel welds containing small amounts of titanium.KEY WORDS: steel welds; inclusion formation; weld solidification; nonequilibrium phase transformations; bainite; acicular ferrite.

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“…The term ''acicular ferrite'' (AF) was first used by Grong [34] and Abson [35] in 1986. AF usually forms in forged and welded steels, and the term ''acicular'' means shaped and pointed like a needle, but the true shape is that of a lenticular plate.…”

Section: Mechanism Of Microstructural Evolutionmentioning

confidence: 99%

Effects of Tungsten Addition on the Microstructure and Mechanical Properties of Microalloyed Forging Steels

Zhao

Lee

et al. 2013

Metall Mater Trans A

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In the current study, the effects of tungsten (W) addition on the microstructure, hardness, and room/low [223 K and 173 K (-50 C and -100 C)] temperature tensile properties of microalloyed forging steels were systematically investigated. Four kinds of steel specimens were produced by varying the W additions (0, 0.1, 0.5, and 1 wt pct). The microstructure showed that the addition of W does not have any noticeable effect on the amount of precipitates. The precipitates in W-containing steels were all rich in W, and the W concentration in the precipitates increased with the increasing W content. The mean sizes of both austenite grains and precipitates decreased with the increasing W content. When the W content was equal to or less than 0.5 pct, the addition of W favored the formation of allotriomorphic ferrite, which subsequently promoted the development of acicular ferrite in the microalloyed forging steels. The results of mechanical tests indicated that W plays an important role in increasing the hardness and tensile strength. When the testing temperature was decreased, the tensile strength showed an increasing trend. Both the yield strength and the ultimate tensile strength obeyed an Arrhenius type of relation with respect to temperature. When the temperature was decreased from 223 K to 173 K (from -50 C to -100 C), a ductile-to-brittle transition (DBT) of the specimen with 1 pct W occurred. The addition of W favored a higher DBT temperature. From the microstructural and mechanical test results, it is demonstrated that the addition of 0.5 pct W results in the best combination of excellent room/low-temperature tensile strength and ductility. 2013 The Minerals, Metals & Materials Society and ASM International. Effects of Tungsten Addition on the Microstructure and Mechanical Properties of Microalloyed Forging Steels JINGWEI ZHAO, TAEKYUNG LEE, JEONG HUN LEE, ZHENGYI JIANG, and CHONG SOO LEEIn the current study, the effects of tungsten (W) addition on the microstructure, hardness, and room/low [223 K and 173 K (À50°C and À100°C)] temperature tensile properties of microalloyed forging steels were systematically investigated. Four kinds of steel specimens were produced by varying the W additions (0, 0.1, 0.5, and 1 wt pct). The microstructure showed that the addition of W does not have any noticeable effect on the amount of precipitates. The precipitates in W-containing steels were all rich in W, and the W concentration in the precipitates increased with the increasing W content. The mean sizes of both austenite grains and precipitates decreased with the increasing W content. When the W content was equal to or less than 0.5 pct, the addition of W favored the formation of allotriomorphic ferrite, which subsequently promoted the development of acicular ferrite in the microalloyed forging steels. The results of mechanical tests indicated that W plays an important role in increasing the hardness and tensile strength. When the testing temperature was decreased, the tensile strength showed an increasing trend. Both...

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Factors influencing as-deposited strength, microstructure, and toughness of manual metal arc welds suitable for C-Mn steel fabrications

Cited by 43 publications

References 3 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

Inclusion Formation and Microstructure Evolution in Low Alloy Steel Welds.

Effects of Tungsten Addition on the Microstructure and Mechanical Properties of Microalloyed Forging Steels

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