Study of high toughness ferrite wire for submerged arc welding of pipeline steel

Peng, Yun; Chen, Wuzhu; Xu, Zhezhuang

doi:10.1016/s1044-5803(01)00155-3

Cited by 26 publications

(17 citation statements)

References 7 publications

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“…The results of other authors 10,17,21,[23][24][25][26][27][28] also show the improvements of mechanical properties in weld metal and HAZ with an increased proportion of acicular ferrite in the microstructure. For instance, Garland and Kirkwood 24,25) found that additions of Mo-Nb or Mo-Ti improved the toughness due to AF formation in the welds of C-Mn steel.…”

Section: ϫ2mentioning

confidence: 76%

“…Thewlis 21) reported that even in wrought (thermo-mechanically treated) steels as well as in HAZ of welds, fine cerium sulphide inclusions initiated the formation of acicular ferrite in steel and imparted very good toughness. Similarly, Peng et al 26) found that in submerged arc welds of X-70 line-pipe steel (0.087 % C, 1.5 % Mn and 0.014 % Ti), TiN inclusions nucleated AF which resulted in a high toughness. Even in fire resistant steels, Ohkita and Horii 10) found that AF steels are better than steels with ferrite-pearlite structures with respect to strength and toughness at high temperatures.…”

Section: ϫ2mentioning

confidence: 93%

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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: ϫ2mentioning

confidence: 76%

Section: ϫ2mentioning

confidence: 93%

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

2009

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“…The formation of AF depends not only on a suitable combination of alloying elements and cooling rate but also on the existence of an appropriate distribution of inclusions. [64][65][66] It is well known that Ni and Mo in the WM play important roles in microstructural control. 67 Shankar and Devletian 61 found the toughness decreased due to Ni increasing in Fe-Ni alloys but could be better in Fe-C-Ni ternary alloys related to composition in terms of a variable coefficient for C in the Ni equivalent.…”

Section: Weld Metalmentioning

confidence: 99%

Challenges and developments in pipeline weldability and mechanical properties

Liu

Bhole

2013

Science and Technology of Welding and Joining

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Recent economic and political events have further highlighted the need for new and strategically accessible sources of oil and gas. With the continually increasing demand for oil and gas, the requirement for pipeline steels with higher strength, toughness and weldability has been one of the most important factors driving the development of high strength pipeline steels, particularly with the oil exploration proceeding into arctic and deep sea regions, enhancing the weldability and mechanical properties of the new pipeline steels and weld consumables. Developments in the welding processes for manufacture and field welding are described in terms of process principles, equipment, consumables, weld quality, process economics and further developments. The increasing and changing requirement for weldability and mechanical properties in the heat affected zone and weld metal of pipeline welds are presented along with the reported solutions to the problems.

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“…Previous research have noted the positive influence of acicular ferrite (AF) in the microstructure on the toughness of low carbon and welded pipeline steels [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. AF is formed by bainitic reaction, but unlike bainite that grows as a sheaf of ferrite plates from the austenite grain boundary, AF nucleates intragranularly at inclusions, forming fine interlocking structure of laths and/or plates [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures

et al. 2022

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Cleavage fracture of the V and Ti-V microalloyed forging steels was investigated by the four-point bending testing of the notched specimens of Griffith-Owen’s type at −196 °C, in conjunction with the finite element analysis and the fractographic examination by scanning electron microscopy. To assess the mixed microstructure consisting mostly of the acicular ferrite, alongside proeutectoid ferrite grains and pearlite, the samples were held at 1250 °C for 30 min and subsequently cooled instill air. Cleavage fracture was initiated in the matrix under the high plastic strains near the notch root of the four-point bending specimens without the participation of the second phase particles in the process. Estimated values of the effective surface energy for the V and the Ti-V microalloyed steel of 37 Jm−2 and 74 Jm−2, respectively, and the related increase of local critical fracture stress were attributed to the increased content of the acicular ferrite. It was concluded that the observed increase of the local stress for cleavage crack propagation through the matrix was due to the increased number of the high angle boundaries, but also that the acicular ferrite affects the cleavage fracture mechanism by its characteristic stress–strain response with relatively low yield strength and considerable ductility at −196 °C.

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Study of high toughness ferrite wire for submerged arc welding of pipeline steel

Cited by 26 publications

References 7 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

Challenges and developments in pipeline weldability and mechanical properties

Cleavage Fracture of the Air Cooled Medium Carbon Microalloyed Forging Steels with Heterogeneous Microstructures

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