Precipitation of Nb in Ferrite After Austenite Conditioning. Part I: Microstructural Characterization

Iza-Mendia, A.; Altuna, M. A.; Pereda, Beatriz; Gutiérrez, Isabel

doi:10.1007/s11661-012-1395-y

Cited by 42 publications

(43 citation statements)

References 41 publications

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“…Examples of these microstructures are shown in Part 1, [25] whereas Figure 1 shows SEM images of the samples processed according to S1 and S2 and coiled at 873 K (600°C). Decreasing the coiling temperature leads to mixtures of polygonal ferrite and bainitic microstructures, as can be observed in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

“…The applied model predicts the completion of Nb precipitation after~1 hour holding at 1143 K (870°C), but this can vary depending on local Nb concentration and/or small deviations in processing conditions. [25] This is why the tensile results for S1 have not been plotted in Figure 7. Nevertheless, independently of the previous deformation sequence and of the scatter in yield strength for S1, the steel is softer when it is held at 1143 K (870°C) before coiling at 923 K (650°C).…”

Section: Resultsmentioning

confidence: 99%

“…Steel A is the same one used in the first part of this study. [25] Plane strain compression tests were performed on industrially produced wrought steels to condition the austenite and investigate the effect of the coiling conditions. The load was applied on the initial rolling plane and perpendicular to the rolling direction.…”

Section: Methodsmentioning

confidence: 99%

“…The strain-induced precipitation model predicts the full precipitation of the Nb as a result of this holding stage for steel A when processed according to the S2-R sequence. [25] Nevertheless, no precipitation is expected in steel C after the S1-R. Prolonged holding at coiling temperature: The same conditions applied to coiling were applied, except that the holding time was 6, 24, or 48 hours, instead of the 1 hour applied to the coiling simulations.…”

Section: Methodsmentioning

confidence: 99%

“…The current work is the second of a series of two that has gone in depth into this subject. The first part [25] was dedicated to investigating the ferrite microstructure obtained at high coiling temperatures by transmission electron microscopy. The ferrite, formed for a coiling temperature ranging between 873 K and 1023 K (600°C and 750°C), did not show significant differences in dislocation density, image quality maps, or grain boundary distribution.…”

Section: ½2mentioning

confidence: 99%

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Precipitation of Nb in Ferrite After Austenite Conditioning. Part II: Strengthening Contribution in High-Strength Low-Alloy (HSLA) Steels

Altuna

Iza-Mendia

Gutiérrez

2012

Metall Mater Trans A

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. ALTUNA, AMAIA IZA-MENDIA, and I. GUTIÉ RREZ Often, Nb contributes to the strength of a microalloyed steel beyond the expected level because of the grain size strengthening resulting from thermomechanical processing. Two different mechanisms are behind this phenomenon, and both of them have to do with the amount of Nb remaining in solution after hot rolling. The first of them is the increase of the hardenability of the steel as a result of Nb, and the second one is the fine precipitation of NbC in ferrite. Three Nb microalloyed steels were thermomechanically processed in the laboratory and coiled at different temperatures to investigate the effect of Nb content on the tensile properties. The extra strength was linearly related to the Nb remaining in solution after the hot working. The maximum contribution from Nb was reached for a coiling temperature of 873 K (600°C).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: ½2mentioning

confidence: 99%

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Precipitation of Nb in Ferrite After Austenite Conditioning. Part II: Strengthening Contribution in High-Strength Low-Alloy (HSLA) Steels

Altuna

Iza-Mendia

Gutiérrez

2012

Metall Mater Trans A

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Microstructure of Nb‐Bearing Pipeline Steel with Improved Property Applying Ultrafast Cooling Process

Yao

Wang

2013

steel research int.

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X70 pipe line steel with high mechanical strength and high ductility can be achieved through hot rolling and ultrafast cooling process at a low cost. A large amount of nanosized precipitates and dislocations are identified near the surface layer of the steel applying ultrafast cooling, which contribute immeasurably to the improvement of mechanical properties. In addition, high cooling rate decreases the mean distance of pearlite laminae, and massive ferrite grains characterized by curved grain boundaries and high dislocation density are also transformed as one of the typical microstructures in the samples applying ultrafast cooling process.

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Precipitation Behavior and Microstructural Evolution of Vanadium-Added TRIP-Assisted Annealed Martensitic Steel

Song

et al. 2016

steel research int.

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(1 of 4) 1770053 Cover Photo: Electrochemical reactions always occur at the electrode-slag and slag-metal melt interfaces during the electroslag remelting (ESR) process. The cover shows a schematic representation of this process. A numerical model is developed to investigate those reactions together with the ion transport phenomenon. The cover fi gure is supplied by Christian Doppler Laboratory for Advanced Process An overview and discussion on a range of electromagnetic effects, including magnetic damping, magnetic levitation, pinch effect, as well as magnetic texture, and thermoelectric magnetic effect, etc., on themetallic materials morphology or fl ow behavior as well as on the corresponding particles. Recent development in improving the magnetic fl ux density has enable more signifi cant magnetic effects on weakly magnetic materials. The precipitation behavior and microstructural evolution of vanadiumadded TRIP-assisted annealed martensitic (TAM) steel are investigated using 3DAP. According to the 3DAP analysis, C, Mn and V atoms segregating at interface between retained austenite and BCC phases, and they can make the interface more stabilization by effectively pin the interface.

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Precipitation of Nb in Ferrite After Austenite Conditioning. Part I: Microstructural Characterization

Cited by 42 publications

References 41 publications

Precipitation of Nb in Ferrite After Austenite Conditioning. Part II: Strengthening Contribution in High-Strength Low-Alloy (HSLA) Steels

Precipitation of Nb in Ferrite After Austenite Conditioning. Part II: Strengthening Contribution in High-Strength Low-Alloy (HSLA) Steels

Microstructure of Nb‐Bearing Pipeline Steel with Improved Property Applying Ultrafast Cooling Process

Precipitation Behavior and Microstructural Evolution of Vanadium-Added TRIP-Assisted Annealed Martensitic Steel

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