Enhanced hardening by multiple microalloying in low carbon ferritic steels with interphase precipitation

Zhang, Yongjie; Miyamoto, Gorō

doi:10.1016/j.scriptamat.2022.114558

Cited by 19 publications

(9 citation statements)

References 29 publications

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“…[1][2][3][4] Microalloyed steels are widely used in engineering structures, such as buildings, bridges, rails, and pipelines, because of their high strength, light weight, and low cost. [5,6] HSLA pipeline steels have practical applications in the field of oil and gas transportation, such as the West-to-East Gas Transmission Project and, therefore, the demand for steel is high. When the demand of steel increases, the price also increases.…”

Section: Introductionmentioning

confidence: 99%

“…The high finish rolling temperature (FRT), the high thermal deformation occurred in the nonrecrystallization zone of austenite resulted in high-density crystal defects and increased the nucleation sites of austenite-ferrite phase transformation, thus refining the ferrite grains. [6,[13][14][15][16][17][18][19] Besides, during controlled rolling, austenite grain growth can be hindered through boundary pinning by undissolved (Ti, Nb, V) (C, N) particles. These particles can also retard the recrystallization of the deformation austenite through pinning of the grain boundary and sub-boundary.…”

Section: Introductionmentioning

confidence: 99%

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Thermomechanical Control of Microstructure and Precipitation in Vanadium Microalloyed Steel: Influence of Finish Rolling and Coiling Temperatures

Wu,

Yang,

Tang

et al. 2024

steel research int.

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Six hot compression tests are conducted using the Gleeble3500 thermomechanical simulator to investigate the microstructural evolution and precipitation behavior in low‐C–Mn V‐microalloyed steel. The specimens are subjected to hot isothermal compression deformation of 87%. The optical microscopy and transmission electron microscopy using carbon extraction replica method are used to characterize the microstructures and precipitation after the simulated thermomechanical controlled process and coiling. The results indicate that increasing the finish rolling temperature benefits the refinement of ferrite grains but has little influence on the refinement of the precipitates. It is also observed that lower coiling temperatures (CTs) promote the formation of fine precipitates. When the CT is 500 °C, the average precipitate size is found to be 86 nm. Furthermore, it is found that the CT significantly influences the nucleation sites of the precipitates inter alia, the matrix, interphase, grain boundaries, and dislocations. As expected, at higher CTs, nucleation is predominantly on the defects rather than the matrix.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermomechanical Control of Microstructure and Precipitation in Vanadium Microalloyed Steel: Influence of Finish Rolling and Coiling Temperatures

Wu,

Yang,

Tang

et al. 2024

steel research int.

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“…The engineering application and mechanical properties of Nb−alloyed steels are inseparable from the regulation of a microstructure by phase transformation. The addition of Nb in low−carbon steels significantly affects the phase transformation kinetics of ferrite phase transformation, and two effects in general need to be emphasized: (i) Nb in a solid solution tends to segregate at the interface [1,[10][11][12]; and (ii) Nb is a strong carbide−forming element [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Solute Drag Effect and Interphase Precipitation of Nb on Ferrite Transformation

Cai,

Wei,

Jin

et al. 2024

Materials

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The significant impact of Nb on ferrite transformation, both in terms of solute drag effect (SDE) and interphase precipitation, was investigated quantitatively. Ferrite transformation kinetics were characterized using thermal expansion experiments and theoretical calculations. The microstructures were characterized using high−temperature confocal laser scanning microscopy (CLSM), a field−emission scanning electron microscope (FESEM), and a transmission electron microscope (TEM). Under a higher driving force, interphase precipitations were observed in the sample with a higher Nb content. A three−dimensional (3D) reconstruction method was used to convert the two−dimensional (2D) image of interphase precipitation into a three−dimensional model for a more typical view. The SDE and interphase precipitation had opposite effects on the kinetics of ferrite transformation. A lower Nb content showed a strong contribution to the SDE, which delayed ferrite transformation. A higher concentration of Nb was expected to enhance the SDE, but the inhibition effect was eliminated by the interphase precipitation of NbC during interfacial migration. Both the experimental results and theoretical calculations confirmed this phenomenon.

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“…However, the ledge mechanism formulated by Davenport and Honeycombe still remains the most commonly accepted approach for the formation of planar IP on a semi-coherent interface [6]. It has been suggested that IP forms along the migrating ferrite ledges that are parallel to austenite/ferrite interfaces [2,18,19]. The pinning of the boundary by precipitates leads to subsequent local breaking away of the boundary, resulting in the creation of mobile ledges.…”

Section: Introductionmentioning

confidence: 99%

Interphase and fibrous precipitation in a thermomechanically processed V–Nb–Mo microalloyed steel

Mukherjee

Timokhina

Wang

et al. 2023

Materials Science and Technology

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A novel V–Nb–Mo steel was thermomechanically processed to promote ferrite grain refinement and precipitation during the austenite to ferrite transformation. Transmission electron microscopy and three-dimensional atom probe tomography confirmed the formation of two main types of precipitates: nano-scale interphase precipitates and fibrous precipitates (FP). Both the precipitates had a Baker–Nutting orientation relationship with the ferrite matrix, but with different variants. Interphase precipitates exhibited a disc shape with an average distance between precipitate rows of 15 ± 2 nm and an average Guinier radius of 3.9 ± 1.7 nm, whereas FP had a rod-shape 2.5 ± 0.5 nm in radius and 8–25 nm in length. It appeared that the FP are formed along the plane perpendicular to the interphase precipitates plane.

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Enhanced hardening by multiple microalloying in low carbon ferritic steels with interphase precipitation

Cited by 19 publications

References 29 publications

Thermomechanical Control of Microstructure and Precipitation in Vanadium Microalloyed Steel: Influence of Finish Rolling and Coiling Temperatures

Thermomechanical Control of Microstructure and Precipitation in Vanadium Microalloyed Steel: Influence of Finish Rolling and Coiling Temperatures

Influence of Solute Drag Effect and Interphase Precipitation of Nb on Ferrite Transformation

Interphase and fibrous precipitation in a thermomechanically processed V–Nb–Mo microalloyed steel

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