A Composite Modeling Analysis of the Deformation Behavior of Medium Manganese Steels

Rana, Radhakanta; Gibbs, Paul J.; Moor, Emmanuel De; Speer, John G.; Matlock, David K.

doi:10.1002/srin.201400577

Cited by 39 publications

(22 citation statements)

References 34 publications

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“…7. The tensile strength and total elongation data of the present steel (austempered at lower temperatures of 300-350°C) overlaid on the tensile-strength elongation diagram for various automotive steels [20]. The tensile properties achieved in the current bainitic steel are truly in the property band of third generation advanced high strength steels (3GAHSS)…”

Section: Tensile Propertiesmentioning

confidence: 92%

“…7, the achieved tensile properties for low temperature austempering (300-350°C) place the current steel truly in the property band of third generation advanced high strength steels (3GAHSS) in the commonly used "strengthelongation diagram" for automotive sheet steels [20]. The best combination of tensile properties was obtained for bainitic transformation at 350°C (UTS = 1590 MPa, TE = 20.5%).…”

Section: Tensile Propertiesmentioning

confidence: 94%

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Mechanical Properties of a Bainitic Steel Producible by Hot Rolling

Rana

Chen

Haldar

et al. 2017

Archives of Metallurgy and Materials

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A carbide-free bainitic microstructure is suitable for achieving a combination of ultra high strength and high ductility. In this work, a steel containing nominally 0.34C-2Mn-1.5Si-1Cr (wt.%) was produced via industrial hot rolling and laboratory heat treatments. The austenitization (900°C, 30 min.) and austempering (300-400°C, 3 h) treatments were done in salt bath furnaces. The austempering treatments were designed to approximately simulate the coiling step, following hot rolling and run-out-table cooling, when the bainitic transformation would take place and certain amount of austenite would be stabilized due to suppression of carbide precipitation. The microstructures and various mechanical properties (tensile properties, bendability, flangeability, and room and subzero temperature impact toughness) relevant for applications were characterized. It was found that the mechanical properties were highly dependent on the stability of the retained austenite, presence of martensite in the microstructure and the size of the microstructural constituents. The highest amount of retained austenite (~ 27 wt.%) was obtained in the sample austempered at 375°C but due to lower austenite stability and coarser overall microstructure, the sample exhibited lower tensile ductility, bendability, flangeability and impact toughness. The sample austempered at 400°C also showed poor properties due to the presence of initial martensite and coarse microstructure. The best combination of mechanical properties was achieved for the samples austempered at 325-350°C with a lower amount of retained austenite but with the highest mechanical stability.

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Section: Tensile Propertiesmentioning

confidence: 92%

Section: Tensile Propertiesmentioning

confidence: 94%

Mechanical Properties of a Bainitic Steel Producible by Hot Rolling

Rana

Chen

Haldar

et al. 2017

Archives of Metallurgy and Materials

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“…Extending this composite model, Rana et al confirmed the significant influence of both the retained austenite fraction and its stability on the tensile deformation behavior of intercritically annealed medium Mn steels. [11] The composite model was applied to a 0.1C-7.1 Mn steel annealed for 168 h at 600, 625, and 650 C (respectively, resulting in retained austenite contents of 32%, 38%, and 44%) to predict UTS and UE. For the predictions, experimentally measured phase fractions and martensite transformation kinetics were used as inputs.…”

Section: Introductionmentioning

confidence: 99%

Intercritical Annealing Response of Medium Manganese Steels Having Different Carbon Concentrations

Kang

Hofer

Speer

et al. 2018

steel research int.

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Tensile properties of intercritically annealed medium Mn steels containing 4.5 wt% manganese and two different carbon levels of 0.1 and 0.2 wt% are predicted using a composite iso‐strain model. In the predictions, the evolutions of phase fraction and retained austenite stability with annealing temperature are considered assuming ortho‐equilibrium phase fractions and full alloy partitioning during intercritical annealing. Predicted evolutions of ultimate tensile strength and uniform elongation values with variation in intercritical annealing temperature are compared to experimental results obtained following annealing for 1 h. The experimental results confirm the predicted dependence of the tensile properties on annealing temperature. While the product of ultimate tensile strength and uniform elongation has a linear relationship with the retained austenite fraction, experimental values exhibit a greater dependence on the retained austenite fraction than the predicted values.

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“…They consist of different soft and hard structural constituents in various proportions, which enable the attainment of a very wide range of mechanical and technological properties. The microstructure of dual-phase (DP) steel consists of soft ferrite and hard martensite, whereas the multiphase microstructure of TRIP (transformation-induced plasticity) steel comprises ferrite, bainite, and retained austenite [1][2][3][4][5][6]. New demands of the automotive industry for relatively low-cost steel sheets characterized by tensile strength above 1000 MPa require further searching for new chemical composition strategies.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibrium and Austenite Decomposition in Advanced High-Strength Medium-Mn Bainitic Steels

Grajcar

Zalecki

Burian

et al. 2016

Metals

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Abstract:The work addresses the phase equilibrium analysis and austenite decomposition of two Nb-microalloyed medium-Mn steels containing 3% and 5% Mn. The pseudobinary Fe-C diagrams of the steels were calculated using Thermo-Calc. Thermodynamic calculations of the volume fraction evolution of microstructural constituents vs. temperature were carried out. The study comprised the determination of the time-temperature-transformation (TTT) diagrams and continuous cooling transformation (CCT) diagrams of the investigated steels. The diagrams were used to determine continuous and isothermal cooling paths suitable for production of bainite-based steels. It was found that the various Mn content strongly influences the hardenability of the steels and hence the austenite decomposition during cooling. The knowledge of CCT diagrams and the analysis of experimental dilatometric curves enabled to produce bainite-austenite mixtures in the thermomechanical simulator. Light microscopy (LM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were used to assess the effect of heat treatment on morphological details of produced multiphase microstructures.

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A Composite Modeling Analysis of the Deformation Behavior of Medium Manganese Steels

Cited by 39 publications

References 34 publications

Mechanical Properties of a Bainitic Steel Producible by Hot Rolling

Mechanical Properties of a Bainitic Steel Producible by Hot Rolling

Intercritical Annealing Response of Medium Manganese Steels Having Different Carbon Concentrations

Phase Equilibrium and Austenite Decomposition in Advanced High-Strength Medium-Mn Bainitic Steels

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