Medium-Alloy Manganese-Rich Transformation-Induced Plasticity Steels

Suh, Dong‐Woo; Ryu, Jungho; Joo, Min Sung; Yang, Hong; Lee, Kyooyoung; Bhadeshia, H. K. D. H.

doi:10.1007/s11661-012-1402-3

Cited by 132 publications

(68 citation statements)

References 15 publications

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“…Therefore, the steel possessed continuous yielding behavior with relatively high yield strength. However, the low intercritical annealing temperature resulted in stable retained austenite, which was difficult to transform into martensite or twins during deformation [27,28]. Hence, the steel exhibited a low strain-hardening rate with limited elongation.…”

Section: Influence Of Intercritical Annealing Temperature On the Thermentioning

confidence: 99%

“…Extensive research has focused on the influence of intercritical annealing parameters (intercritical annealing temperature [9,[25][26][27][28], intercritical annealing time [11,29], austenitization temperature [30,31], and heating rate in intercritical annealing [32] etc.) on microstructure and mechanical properties of medium-Mn steels.…”

Section: Introductionmentioning

confidence: 99%

“…on microstructure and mechanical properties of medium-Mn steels. It was reported that the intercritical annealing temperature is of significant importance for the amount and stability of retained austenite [9,27,28,33]. An increase in intercritical annealing temperature in a certain range results in an increase in austenite fraction without much deterioration of austenite stability; meanwhile, the stacking fault energy (SFE) of austenite is increased [9,26].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Song

Zhou

et al. 2018

Metals

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Medium-Mn steels are characterized by ultrafine-grained (UFG) duplex microstructure consisting of ferrite and a large amount of retained austenite. Intercritical annealing is of great importance to achieving the UFG duplex microstructure and adjusting amount as well as stability of retained austenite. In the present work, the influence of intercritical annealing temperature on the microstructure and mechanical properties was investigated in a cold-rolled medium-Mn steel Fe-12Mn-3Al-0.05C. Particularly, the dependence of microstructural morphology on intercritical annealing temperature was emphasized to reveal the genesis of the microstructural morphology in medium-Mn steels. The ferrite-austenite duplex microstructure manifested an elongated morphology in the specimen annealed at 555 • C, which inherited the lath structure of the cold-rolled state. The medium-Mn steel exhibited a continuous yielding behavior and a relatively low strain-hardening rate. With an increase in intercritical annealing temperature up to 650 • C, the amount of retained austenite increased and microstructure was partially recrystallized, showing a mixture of elongated and equiaxed grain morphologies. When the intercritical annealing was applied at 700 • C, the medium-Mn steel mainly exhibited recrystallized microstructure with equiaxed morphology. The optimal balance between the amount and the stability of retained austenite led to an enhancement of strain hardening and ductility. With a further increase in the intercritical annealing temperature to 750 • C, the medium-Mn steel possessed pronounced strain-hardening behavior at the beginning of the tensile deformation with deteriorated ductility.

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Section: Influence Of Intercritical Annealing Temperature On the Thermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Song

Zhou

et al. 2018

Metals

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“…In the present study, we performed laser welding on sheets of a ferrite-based lightweight steel containing high concentrations of Mn, Al, and C. Further, the steel consisted of dual phases with different mechanical properties and underwent work hardening during deformation [9,32]. Therefore, there could be three reasons for the fracturing that occurred in the HAZ.…”

Section: Tensile Properties Of Laser Weldsmentioning

confidence: 99%

Effects of Phase Evolution on Mechanical Properties of Laser-Welded Ferritic Fe-Al-Mn-C Steel

Kang

Kim

Han

et al. 2017

Metals

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Abstract:In the present study, the evolution of microstructure in laser-welded joints of ferrite-based dual-phase Fe-Al-Mn-C steel sheets was analyzed and its effect on the mechanical properties of the joints was investigated. Laser welding was performed using different powers and welding speeds to attain different heat inputs. Electron backscatter diffraction (EBSD) examinations and hardness measurements were used to characterize the microstructure of the welds. The tensile properties were found to depend on the heat input, but joint strength exceeding that of the base metal (BM) were obtained at low heat inputs. However, the fracture location shifted from the base metal to the heat-affected zone (HAZ) as the heat input was increased. The HAZ consisted of a mixture of austenite, ferrite and martensite, and its width increased with increasing the heat input. It was supposed that the incompatibility between the ferrite, austenite and martensite phases led to early void formation and fracturing of the phase interfaces in the wide HAZ.

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“…These steels are under development as a substitute to 1st (low alloy) and 2nd generation (high-Mn) steels, aiming at improved combinations of strength and ductility [1][2][3][4]. In medium-Mn steels, the manganese content is in the range between 3 and 12 pct and the microstructure consists of an ultrafine ferriteaustenite mixture.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Cyclic Transformations in the Intercritical Range of a 5Mn Steel

Sarafoglou¹,

Tzini²,

Haidemenopoulos³

2015

Int J Metall Mater Eng

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Partial cyclic phase transformations α→γ and γ→α triggered by temperature cycling in the intercritical range (α+γ) have been simulated in a medium-Mn steel with composition Fe-0.2C-5Mn. Additional simulations have been performed in Fe-0.2C-0.2Mn and Fe-0.2C steels for comparison. The computational kinetics software DICTRA has been employed for the simulations. All simulations were carried out under local equilibrium conditions. A specially-designed thermal cycle was considered. The position and the velocity of the austenite-ferrite interface were monitored during temperature cycling. Cyclic behavior is characterized by hysteresis loop formation. No loop formation was observed for the plain carbon steel. The inverse transformation, where the interface proceeds in a direction opposite to the temperature change has been identified for the Fe-0.2C-5Mn steel. The duration of the inverse transformation stage is larger at the minimum temperature of the cycle while the phase fraction formed during the inverse transformation is larger at the maximum temperature of the cycle. When the cyclic transformation takes place at a time before the final phase equilibrium in the isothermal curve, the transformation is characterized as inverse during the whole cooling part of the cycle. A stagnant stage where the transformation is very sluggish was observed during the cyclic transformations for the steels investigated. The study of cyclic transformations provides insight into the kinetics of phase transformations in medium-Mn steels.

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Medium-Alloy Manganese-Rich Transformation-Induced Plasticity Steels

Cited by 132 publications

References 15 publications

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Effects of Phase Evolution on Mechanical Properties of Laser-Welded Ferritic Fe-Al-Mn-C Steel

Simulation of Cyclic Transformations in the Intercritical Range of a 5Mn Steel

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