Mechanical properties of a cold-rolled annealed HSLA steel

Prasad, N.K.; Kumar, Sharvan; Kumar, Pramod; Ojha, S. P.

doi:10.1007/bf01143207

Cited by 9 publications

(6 citation statements)

References 3 publications

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“…With an increase in temperature and dwell time, recrystallization (%) increases (6 % for 700 o C 0 s; 75 % for 800 o C 0 s; 91 % for 800 o C 2 min), and because of softening, average hardness (HV/1) decreases from 280 to 190 HV number as shown in Fig.9. With increase in temperature and dwell time dislocation density (in present case GND density) decreases and leads to softening [63].…”

Section: Role Of Alpha and Gamma Fibres During Annealingmentioning

confidence: 70%

Quasi in-situ analysis of geometrically necessary dislocation density in α-fibre and γ-fibre during static recrystallization in cold-rolled low-carbon Ti-V bearing microalloyed steel

Kapoor

Lan

Rijkenberg

et al. 2018

Materials Characterization

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NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/. Publisher's statement:Please refer to the repository item page, publisher's statement section, for further information.For more information, please contact the WRAP Team at: wrap@warwick.ac.uk.Quasi in-situ analysis of geometrically necessary dislocation density in α-fibre and γ-fibre during static recrystallization in cold-rolled low-carbon Ti-V bearing microalloyed steel Abstract In the present study, cold-rolled low-carbon steel is annealed at three different conditions: 700 o C for 0 s, 800 o C for 0 s and 800 o C for 2 min at the heating rate of ~10 o C/s. Recrystallization behaviour on sample surface is studied using a heated stage Scanning Electron Microscopy and Electron Backscattered Diffraction. For the lower annealing temperature of 700 o C with no dwell, almost no recrystallization is observed and microstructure resembles the as-received deformed material with the exception of occasional sub-micron sized nuclei. For the annealing conditions of 800 o C 0 s and 800 o C 2 min, onset and evolution of recrystallization is observed in-situ as a function of the initial as-cold rolled texture. Slower recovery rate of alpha fibre than gamma fibre is observed and confirmed by lower drop in average geometrically necessary dislocation (GND) density for un-recrystallized alpha fibres(1.1E+14 m -2 for 700 o C 0 s , 1.4E+14 m -2 for 800 o C 0 s and 4.5E+14 m -2 for 800 o C 2 min) than for un-recrystallized gamma fibre grains (3.0E+14 m -2 for 700 o C 0 s , 6.2E+14 m -2 for 800 o C 0 s and 9.8E+14 m -2 for 800 o C 2 min) during annealing. Strong gamma texture in recrystallized matrix is found for annealing conditions of 800 o C 0 s and 800 o C 2 min. From TEM characterisation it was shown that sub-grain boundaries are decorated with fine precipitates (diameter d < 15 nm) of titanium-vanadium carbides (Ti,V)C for the annealing condition of 700 o C 0 s, which suggests that these precipitates play a major overall role in retardation of the recrystallization kinetics.

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Section: Role Of Alpha and Gamma Fibres During Annealingmentioning

confidence: 70%

Quasi in-situ analysis of geometrically necessary dislocation density in α-fibre and γ-fibre during static recrystallization in cold-rolled low-carbon Ti-V bearing microalloyed steel

Kapoor

Lan

Rijkenberg

et al. 2018

Materials Characterization

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“…Microalloying content of Nb, Ti, V or Mo in low-carbon microalloyed steel grades is limited to avoid inhibition of recrystallization and maintain precipitation strengthening [22][23][24][25][26][27][28][29]. Static recrystallization and precipitation behaviour of cold-rolled low-carbon microalloyed steel during sub-critical annealing in the fully ferritic region is relatively less understood as compared to dynamic recrystallization during hot rolling of austenite.…”

Section: Introductionmentioning

confidence: 99%

Correlative analysis of interaction between recrystallization and precipitation during sub-critical annealing of cold-rolled low-carbon V and Ti–V bearing microalloyed steels

Kapoor

Lan

Rijkenberg

et al. 2020

Materials Science and Engineering: A

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“…Therefore, a subsequent annealing process is normally needed to remove residual stress, reduce anisotropy of mechanical properties, and acquire equiaxed fine grains of the cold-rolled HSLA steels. A previous study demonstrated that an annealing process at 600℃ for 1 hour could fully recover the optimized mechanical properties of the cold-rolled HSLA steel which had undergone above 60% deformation [16].…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterization and recrystallization kinetics modeling of annealing cold-rolled vanadium microalloyed HSLA steels

Liu

Olivares

Lei

et al. 2016

Journal of Alloys and Compounds

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In this study, we investigated the microstructural evolution and recrystallization kinetics during the annealing of cold-rolled Vanadium microalloyed HSLA (denoted as HSLA-V) steels using both experimental characterization techniques and theoretical model analysis method. Our experimental results indicate that the recrystallization kinetics can be quantified with the evolution of volume fraction of recrystallization as a function of annealing time, and is strongly dependent on the processing parameters (i.e., cold-rolling reduction and annealing temperature) of the HSLA-V steels. Validated by experimental data, our physics-based model analysis revealed that the recrystallization process in the HSLA-V steels consisted of an early stage with both nucleation and grain growth processes and a later stage with grain growth only. Moreover, the growth of the recrystallized grains was found to follow one dimensional preferential growth mechanism, owing to the dispersed V(C,N) precipitates, in the HSLA-V steels. Consequently, our new analysis model is demonstrated to be useful to gain insights into the recrystallization kinetics in the annealed cold-rolled HSLA-V and even other microalloyed steels.

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Mechanical properties of a cold-rolled annealed HSLA steel

Cited by 9 publications

References 3 publications

Quasi in-situ analysis of geometrically necessary dislocation density in α-fibre and γ-fibre during static recrystallization in cold-rolled low-carbon Ti-V bearing microalloyed steel

Quasi in-situ analysis of geometrically necessary dislocation density in α-fibre and γ-fibre during static recrystallization in cold-rolled low-carbon Ti-V bearing microalloyed steel

Correlative analysis of interaction between recrystallization and precipitation during sub-critical annealing of cold-rolled low-carbon V and Ti–V bearing microalloyed steels

Microstructural characterization and recrystallization kinetics modeling of annealing cold-rolled vanadium microalloyed HSLA steels

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