On the intercritical annealing parameters and ensuing mechanical properties of low-carbon medium-Mn steel

Bansal, Gaurav; Madhukar, D.A.; Chandan, Avanish Kumar; Ashok, K.; Mandal, G. K.; Srivastava, V. C.

doi:10.1016/j.msea.2018.07.055

Cited by 40 publications

(25 citation statements)

References 34 publications

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“…Wang et al [29] suggested that coarse martensite lath leads to easy strain localization. Subsequently, in another study by the present authors, [25] a comparison was made between microstructures having similar retained austenite content but different degrees of fineness. The finer structure gave rise to a considerable increase in strength.…”

Section: Discussionmentioning

confidence: 95%

“…It has now been an accepted fact, considering the recent research reports, that the presence of retained austenite in the microstructure suppresses the microcrack propagation and absorbs dislocations from adjacent martensite, leading to improvement in ductility as well as impact toughness. [23][24][25][26] This implies that the amount, size, distribution and morphology of retained austenite would play a determining role in the response to deformation. The present authors, in their earlier study, [11] looked into the effect of quench temperature on the retained austenite content for the same steel investigated in the present work.…”

Section: Discussionmentioning

confidence: 99%

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Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Bansal

Jena

Ghosh

et al. 2020

Metall Mater Trans A

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The present study demonstrates the role of hot rolling and quench temperature in determining the mechanical properties of low alloy steel processed through quenching and nonisothermal partitioning (Q&P) route. The results indicate that the abrasive wear resistance does not show any significant variation with quench temperature. However, a reduction in tensile strength and an increase in charpy impact toughness and elongation is observed with increasing quench temperature. Interestingly, the retained austenite shows high thermal stability at sub-zero temperature. Furthermore, during deformation through the wear process, the retained austenite experiences the TRIP effect that leads to improvement in wear resistance. The incorporation of hot rolling prior to Q&P led to a significant improvement in strength, energy absorption capability and wear resistance due to a considerable refinement of the microstructural constituents.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Bansal

Jena

Ghosh

et al. 2020

Metall Mater Trans A

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“…In general, the LE model can qualitatively predict the basic features of austenite reversion [352,353]. However, the thickening kinetics of reverted austenite predicted by the LE model, in particular at the early stage of austenite reversion, is usually much faster than that measured in experiments.…”

Section: Austenite Reversion From Martensite or Martensite-austenite Mixturementioning

confidence: 86%

“…The processing window to obtain a considerable amount of RA was predicted to be enlarged by Cr addition. The thermodynamic method proposed by De Moor et al has been used widely to optimize processing parameters for medium Mn steels [345][346][347][348][349][350][351][352].…”

Section: Thermodynamics Of Austenite Revisionmentioning

confidence: 99%

Fundamentals and application of solid-state phase transformations for advanced high strength steels containing metastable retained austenite

Dai

Chen

Ding

et al. 2021

Materials Science and Engineering: R: Reports

145

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Over many decades, significant efforts have been made to improve the strength-elongation product of advanced high strength steels (AHSSs) by creating tailored multi-phase microstructures. Successive solid-state phase transformations for steels with a well selected chemical composition turned out to be the key instrument in the realisation of such microstructures. In this contribution, we first provide a brief review of the desired microstructures for Transformation-induced plasticity (TRIP), Carbide-free Bainitic (CFB), Quenching & Partitioning (Q&P) and Medium Manganese steels followed by comprehensive discussions on the phase transformations to be used in their creation. The implications for the steel composition to be selected are addressed too. As the presence of the right amount and type of metastable retained austenite (RA) is of crucial importance for the mechanical performance of these AHSSs, special attention is paid to the important role of successive solid-state phase transformations in creating the desired fraction and composition of RA by suitable element partitioning (in particular C and Mn). This critical partitioning not only takes place during final cooling (austenite decomposition) but also during the back transformation (austenite reversion) during reheating.This review aims to be more than just descriptive of the various findings, but to present them from a coherent thermodynamic / thermo-kinetic perspective, such that it provides the academic and industrial community with a rather complete conceptual and theoretical framework to accelerate the further development of this important class of steels. The detailed stepwise treatment makes the review relevant not only for experts but also metallurgists entering the field.

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“…As a consequence of ART annealing, the microstructure consists mainly of a large fraction of retained austenite (γ R ), ultrafine ferrite, and a small amount of martensite, which are responsible for the excellent mechanical properties that are attributed to medium-Mn steel. ART annealing is critical to obtain the retained austenite because the temperature and time strongly affect its volume fraction and mechanical stability [6][7][8], which triggers the phenomenon of twinning-induced plasticity (TWIP) and/or deformation transformation-induced plasticity (TRIP) during tensile deformation, improving the formability of AHSS [9,10]. Recently, Dong-Woo and Sung-Joon summarized some representative mechanical properties and austenite volume fractions of medium-Mn steels reported in the literature [11].…”

Section: Introductionmentioning

confidence: 99%

Casting and Constitutive Hot Flow Behavior of Medium-Mn Automotive Steel with Nb as Microalloying

Vázquez

Cedeño

Ramos-Azpeitia

et al. 2020

Metals

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A novel medium-Mn steel microstructure with 0.1 wt.% Nb was designed using Thermo-Calc and JMatPro thermodynamic simulation software. The pseudo-binary equilibrium phase diagram and time–temperature transformation (TTT) and continuous cooling transformation (CCT) diagrams were simulated in order to analyze the evolution of equilibrium phases during solidification and homogenization heat treatment. Subsequently, the steel was cast in a vacuum induction furnace with the composition selected from simulations. The specimens were heat-treated at 1200 °C and water-quenched. The results of the simulations were compared to the experimental results. The microstructure was characterized using optical microscopy (OM) and scanning electron microscopy (SEM). We found that the as-cast microstructure consisted mainly of a mixture of martensite, ferrite, and a low amount of austenite, while the microstructure in the homogenization condition corresponded to martensite and retained austenite, which was verified by X-ray diffraction tests. In order to design further production stages of the steel, the homogenized samples were subjected to hot compression testing to determine their plastic flow behavior, employing deformation rates of 0.083 and 0.83 s−1, and temperatures of 800 and 950 °C.

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On the intercritical annealing parameters and ensuing mechanical properties of low-carbon medium-Mn steel

Cited by 40 publications

References 34 publications

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Fundamentals and application of solid-state phase transformations for advanced high strength steels containing metastable retained austenite

Casting and Constitutive Hot Flow Behavior of Medium-Mn Automotive Steel with Nb as Microalloying

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