High-Temperature Flow Stress and Recrystallization Characteristics of Al-Bearing Microalloyed TWIP Steels

Somani, Mahesh C.; Porter, David; Hamada, Atef; Karjalainen, L.P.

doi:10.1007/s11661-015-3112-0

Cited by 14 publications

(14 citation statements)

References 34 publications

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“…As shown in the figure values of p = 2.6 and p = 2.8 were determined for the steels investigated, with no significant effect of steel composition or deformation temperature. These values are very close to those determined by Hamada et al, 15) p = 2.7, for a 25Mn-0.16C-1Al TWIP steel and more recently by Somani et al, 14) p≈3, for various 20Mn-0.6C-(1.5-5)Al steels. Although there is more dispersion, these values are also in the range of those reported for plain low C and microalloyed steels, from p = 1.5 to p = 4, [22][23][24][25][26] and stainless steels, from p = 1.5 to p = 3.…”

Section: Recrystallized Microstructuresupporting

confidence: 91%

“…It has been shown that the activation energies of hot deformation are higher [11][12][13][14] and their static softening kinetics is retarded for these steels compared to plain C-Mn steels. 13,15) Although some empirical equations that predict the softening kinetics of high-Mn steels have been published by Hamada et al for 0.1%C-25%Mn steels with different Al levels, 13,15) and more recently by Somani et al 14) for various 0.6%C-20%Mn-(1.5-5%Al) steels, the effect of varying C or Mn levels in the range of those typically employed in these steels has not been investigated in depth. In addition, very few data are also available concerning the effect of deformation conditions on the recrystallized grain size.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of Static Recrystallization Behavior of High Manganese Austenitic Steels with Different Alloying Contents

et al. 2016

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During hot rolling, austenite recrystallization determines the grain size evolution and the extent of strain accumulation, and therefore, it can be used to control the microstructure and improve the mechanical properties of the final product. However, at the moment, experimental data and models describing the recrystallization kinetics of high-Mn steels are scarce, and they do not take into account the effect of the different C and Mn alloying contents usually present in these steels. The aim of this work is to provide a quantitative model for the determination of the static recrystallization kinetics and recrystallized grain size that is valid for a wide range of high-Mn steel compositions. In order to do this, softening data determined in previous works for steels with different Mn (20 to 30%), Al (0 to 1.5%) and C (0.2 to 1%) levels were considered. In addition, new tests were carried out to determine the effect of deformation conditions on the static softening kinetics and the recrystallized grain size. The static recrystallization kinetics of the high-Mn steels follows Avrami's law, with n Avrami exponents which are temperature dependent and lower than those determined for low C steels. A dependence of the t 0.5 (time for 50% fractional softening) on the carbon content has been observed and it was incorporated into an equation for the calculation of this parameter. An expression that is valid for predicting the recrystallized grain size as a function of deformation conditions is also proposed.

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Section: Recrystallized Microstructuresupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Modelling of Static Recrystallization Behavior of High Manganese Austenitic Steels with Different Alloying Contents

et al. 2016

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“…The estimated Q app values for the 2Mn-1Si and 3Mn-1.5Si steels were about 225 and 241 kJ mol -1 , suggesting that an increase in Si and Mn contents increases Q app . The observed Q app values for the two steels fall in the 177-283 kJ mol -1 range of values reported for other steels, i. e. for C-Mn 184 kJ mol -1 [15,16], 9SMn28 free cutting steel 177 kJ/mol [37], 0.2C-2Mn-0.6Cr-(0-1.5)Si 193 -227 kJ mol -1 [32], C-Mn-Nb 230 kJ mol -1 [15,16], 12Cr stainless 265 kJ mol -1 [38], ordinary Fe-20Mn-1.5Al TWIP 218 kJ mol -1 and Nb-microalloyed Fe-20Mn-1.5Al-0.026Nb TWIP steel 273 kJ mol -1 [26] and Type 304 stainless steel 283 kJ mol -1 [38].…”

Section: Apparent Activation Energy Of Recrystallization (Q App )mentioning

confidence: 99%

“…8. The plots are based on various equations/data generated at the University of Oulu: 304SS [38], Nb-TWIP and TWIP [26], C-Mn-Nb and C-Mn [15,16]. The SRX kinetics of the present high-Si steels are quite similar despite the different levels of Si and Mn alloying.…”

Section: Comparison Of Srx Kinetics Of Various Steel Typesmentioning

confidence: 99%

“…In the course of the development of this model, the influence of alloying with Mn in the range 0.02-2 % and Si up to 1.5 % alloying was also considered by including the instances of a couple of dual-phase and TRIP steels. Data for the SRX of high-Mn twinning induced plasticity (TWIP) type austenitic steels have been published [25,26], but very little SRX data are available for medium-Mn (3-5 % Mn) steels apart from the data of Grajcar et al [27,28] for 3 %Mn-Al(-Nb) and 5 %Mn-Al(-Nb) steels and Cabanas et al [29] for binary Fe-Mn alloys. Medina and Mancilla [30] and Medina and Quispe [31] earlier determined the kinetics as a function of chemical composition accounting for the effects of Si and Mn in addition to the microalloying elements of Nb, Ti and V. Increasing Si up to 0.4 % in some TRIP steels was found to decrease the SRX rate and increase the activation energy of recrystallization (Q rex ) [15,16] Suikkanen et al [32] showed that increasing Si beyond 0.4 % up to 1.5 % has only a small retarding effect on SRX, i. e. the influence of Si appeared to saturate towards 1.5 %.…”

Section: Introductionmentioning

confidence: 99%

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Static recrystallization characteristics and kinetics of high-silicon steels for direct quenching and partitioning

Somani

Porter

Karjalainen

et al. 2019

International Journal of Materials Research

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In the direct quenching and partitioning (DQ&P) process, tough ultra-high-strength steel is made by combining thermomechanical processing with quenching and partitioning to obtain martensite toughened by thin films of retained austenite. The hot rolling stage with deformation and recrystallization between the rolling passes affects the state of the austenite before quenching and partitioning. This paper describes the static recrystallization kinetics of two steels with compositions suited to DQ&P processing, viz. (in wt.%) 0.3C-1Si-2Mn-1Cr and 0.25C-1.5Si-3Mn. The stress relaxation technique on a Gleeble thermomechanical simulator provided recrystallization times over a wide range of temperature, strain, strain rate and initial grain size. The higher levels of Si and Mn made the recrystallization kinetics less sensitive to strain, strain rate and temperature. The equations derived to describe the recrystallization kinetics can be used in the design of the rough rolling part of thermomechanical processing.

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Microstructural Evolution and Hot Deformation Behavior of Cu‐Containing Twinning‐Induced Plasticity Steel

Feng,

Yuan,

Zhao

et al. 2024

steel research int.

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High manganese twinning‐induced plasticity (TWIP) steels with excellent strength and plasticity have promising applications in automotive manufacturing, but limited corrosion resistance affects their further development. Alloying with Cu is a viable solution to improve corrosion resistance. However, there remains a paucity of research concerning the effect of Cu on the hot deformation behavior of TWIP steels. So, the investigation of the recrystallization behavior and microstructural evolution in Fe‐23Mn‐6Cr‐3Al‐0.2C‐xCu (x = 0, 2.5) TWIP steels has been conducted using uniaxial hot compression test. The results reveal that Cu alloying exerts minimal influence on the high‐temperatur flow behavior, with dynamic recrystallization emerging as the predominant softening mechanism in Cu‐containing TWIP steels. However, owing to the drag effect of solute atoms, Cu alloying increases the activation energy for hot deformation and marginally reduces hot workability. Fine recrystallized grains in Cu‐containing TWIP steels can be achieved by hot deformation at lower temperatures and strain rate regions. The recrystallization behavior of Cu‐containing TWIP steels hot deformed at low temperatures and high strain rates is obviously inhibited by the increase of the activation energy and stacking fault energy, coupled with the hindering effect of Cu solute atoms clustered at grain boundaries on grain boundary migration.

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High-Temperature Flow Stress and Recrystallization Characteristics of Al-Bearing Microalloyed TWIP Steels

Cited by 14 publications

References 34 publications

Modelling of Static Recrystallization Behavior of High Manganese Austenitic Steels with Different Alloying Contents

Modelling of Static Recrystallization Behavior of High Manganese Austenitic Steels with Different Alloying Contents

Static recrystallization characteristics and kinetics of high-silicon steels for direct quenching and partitioning

Microstructural Evolution and Hot Deformation Behavior of Cu‐Containing Twinning‐Induced Plasticity Steel

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