Intercritical Annealing Response of Medium Manganese Steels Having Different Carbon Concentrations

Kang, Singon; Hofer, Robert W.; Speer, John G.; Križan, Daniel; Matlock, David K.; Moor, Emmanuel De

doi:10.1002/srin.201800069

Cited by 15 publications

(2 citation statements)

References 20 publications

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“…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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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

View full text Add to dashboard Cite

show abstract

“…In numerous studies, the influence of different intercritical annealing parameters on the mechanical properties has been investigated. [ 22–28 ] The utilization of the TRIP effect can increase the toughness of the steel, [ 29 ] if morphology and phase fraction of the austenite are adjusted accordingly. [ 7,29–31 ] However, the impact toughness in these steels remains a critical issue and is controversially discussed.…”

Section: Introductionmentioning

confidence: 99%

Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels

Gramlich

Bleck

2021

steel research int.

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The mechanical properties after tempering and intercritical annealing of medium manganese steels with 4 wt% Mn for forging applications are presented. After forging with subsequent air cooling, heat treatments were performed, specifically tempering from 250 and 450 °C and intercritical annealing between 600 and 675 °C. Tensile properties, Charpy V‐notch impact toughness, and hardness were determined and compared with microstructural features characterized by metallography and synchrotron measurements, leading to the classification of six different heat treatment stages for medium manganese steels. Furthermore, the effects of different alloying additions (boron 0.0016–0.0057 wt%, molybdenum 0.2 wt%, and aluminum 0.5 wt%) are discussed with respect to the mechanical properties. It is shown that boron increases the impact toughness more effectively in the tempering regime, while the molybdenum alloyed samples exhibit higher toughness after intercritical annealing. Most of the materials and heat treatment states follow the inverse relationship between toughness and strength, while the aluminum alloyed samples show a superior toughness after tempering.

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A Constitutive Relationship of 0.1C-5Mn Steel Coupling with Transformation-Induced Plasticity Effect

Cheng

Mao

Zhao

et al. 2021

J. of Materi Eng and Perform

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Intercritical Annealing Response of Medium Manganese Steels Having Different Carbon Concentrations

Cited by 15 publications

References 20 publications

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

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

Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels

A Constitutive Relationship of 0.1C-5Mn Steel Coupling with Transformation-Induced Plasticity Effect

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