Softening Kinetics in High Al and High Al-Nb-Microalloyed Steels

Pereda, Beatriz; Aretxabaleta, Z.; López, Beatriz

doi:10.1007/s11665-015-1387-3

Cited by 18 publications

(19 citation statements)

References 29 publications

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“…However, it must be mentioned that this was observed for the longest t 0.5 values, which correspond mainly to the lowest applied strain values (ε = 0.1 and ε = 0.15). The lower accuracy of these type of models when low strain levels are applied has also been observed in previous works [38].…”

Section: Static Softening and Strain-iduced Precipitation Behaviorsupporting

confidence: 78%

“…values, which correspond mainly to the lowest applied strain values ( = 0.1 and ε = 0.15). The lower accuracy of these type of models when low strain levels are applied has also been observed in previous works [38]. Regarding the experimental Avrami exponent, in some works this parameter's dependence on deformation temperature has been reported [2,23,40].…”

Section: Static Softening and Strain-iduced Precipitation Behaviorsupporting

confidence: 59%

“…ε in s −1 and T in K. The equation was developed considering steels microalloyed with Nb, Ti and Nb-Ti with 0.035%Nb and 0.067%Ti as maximum levels [3]. Although not applicable in the present work, the equation has been extended to steels with high Mo [37], Al [38] and B [39] additions. In Figure 16 the t 0.5 times calculated from this equation are plotted against the experimentally determined values.…”

Section: Static Softening and Strain-iduced Precipitation Behaviormentioning

confidence: 99%

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Effect of High Ti Contents on Austenite Microstructural Evolution During Hot Deformation in Low Carbon Nb Microalloyed Steels

García-Sesma

López

Pereda

2020

Metals

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This work has focused on the study of hot working behavior of Ti-Nb microalloyed steels with high Ti contents (> 0.05%). The role of Nb during the hot deformation of low carbon steels is well known: it mainly retards austenite recrystallization, leading to pancaked austenite microstructures before phase transformation and to refined room temperature microstructures. However, to design rolling schedules that result in properly conditioned austenite microstructures, it is necessary to develop models that take into account the effect of high Ti concentrations on the microstructural evolution of austenite. To that end, in this work torsion tests were performed to investigate the microstructural evolution during hot deformation of steels microalloyed with 0.03% Nb and different high Ti concentrations (0.05%, 0.1%, 0.15%). It was observed that the 0.1% and 0.15% Ti additions resulted in retarded softening kinetics at all the temperatures. This retardation can be mainly attributed to the solute drag effect exerted by Ti in solid solution. The precipitation state of the steels after reheating and after deformation was characterized and the applicability of existing microstructural evolution models was also evaluated. Determined recrystallization kinetics and recrystallized grain sizes reasonably agree with those predicted by equations previously developed for Nb-Ti microalloyed steels with lower Ti concentrations (<0.05%).

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Section: Static Softening and Strain-iduced Precipitation Behaviorsupporting

confidence: 78%

Section: Static Softening and Strain-iduced Precipitation Behaviorsupporting

confidence: 59%

Section: Static Softening and Strain-iduced Precipitation Behaviormentioning

confidence: 99%

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Effect of High Ti Contents on Austenite Microstructural Evolution During Hot Deformation in Low Carbon Nb Microalloyed Steels

García-Sesma

López

Pereda

2020

Metals

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“…This behaviour is presumably related to the deformation of the austenite below the non-recrystallization temperature [23,25]. The interesting effect is that the flow stress values in fig.…”

Section: Gleeble Simulationsmentioning

confidence: 99%

“…Physical simulation [10,17,[22][23][24][25] and numerical modelling [26][27][28][29] are the effective ways of determining the force-energetic parameters and microstructure evolution during thermomechanical processing. The hot-working behaviour is rarely investigated using semi-industrial hot-rolling lines [9,30,31] or on the basis of real industrial rolling trials [26,32].…”

Section: Introductionmentioning

confidence: 99%

Non-Metallic Inclusions and Hot-Working Behaviour of Advanced High-Strength Medium-Mn Steels

Grajcar¹,

Woźniak²,

Kozłowska³

2016

Archives of Metallurgy and Materials

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The work addresses the production of medium-Mn steels with an increased Al content. The special attention is focused on the identification of non-metallic inclusions and their modification using rare earth elements. The conditions of the thermomechanical treatment using the metallurgical Gleeble simulator and the semi-industrial hot rolling line were designed for steels containing 3 and 5% Mn. Hot-working conditions and controlled cooling strategies with the isothermal holding of steel at 400°C were selected. The effect of Mn content on the hot-working behaviour and microstructure of steel was addressed. The force-energetic parameters of hot rolling were determined. The identification of structural constituents was performed using light microscopy and scanning electron microscopy methods. The addition of rare earth elements led to the total modification of non-metallic inclusions, i.e., they replaced Mn and Al forming complex oxysulphides. The Mn content in a range between 3 and 5% does not affect the inclusion type and the hot-working behaviour. In contrast, it was found that Mn has a significant effect on a microstructure.

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Interaction Between Recovery, Recrystallization, and NbC Strain-Induced Precipitation in High-Mn Steels

Llanos

Pereda

López

2015

Metall Mater Trans A

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Softening Kinetics in High Al and High Al-Nb-Microalloyed Steels

Cited by 18 publications

References 29 publications

Effect of High Ti Contents on Austenite Microstructural Evolution During Hot Deformation in Low Carbon Nb Microalloyed Steels

Effect of High Ti Contents on Austenite Microstructural Evolution During Hot Deformation in Low Carbon Nb Microalloyed Steels

Non-Metallic Inclusions and Hot-Working Behaviour of Advanced High-Strength Medium-Mn Steels

Interaction Between Recovery, Recrystallization, and NbC Strain-Induced Precipitation in High-Mn Steels

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