Effect of the heat treatment on the microstructure and mechanical properties of medium-Mn-steels

Schneider, Reinhold; Steineder, Katharina; Križan, Daniel; Sommitsch, Christof

doi:10.1080/02670836.2018.1548957

Cited by 21 publications

(19 citation statements)

References 42 publications

(91 reference statements)

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“…[10,11,21,22] In general, the duplex microstructures exhibited higher yield stress (YS) and a lower work hardening rate (WHR) than the multiphase ones. [11,13,14,21] Additionally, some multiphase microstructures, such as those formed after being annealed at relatively high IA temperature, would exhibit a very rapid WHR if they contained very unstable austenite. This would make them susceptible to brittle fracture, leading to poor ductility.…”

Section: Introductionmentioning

confidence: 99%

Nanosized Lamellar Structures and Tensile Properties of Intercritical‐Annealed Medium Mn Steels Containing Multiphases

Trang

Jeong

Lee

et al. 2022

steel research int.

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The effect of extended intercritical annealing time on the changes of the microstructure and tensile properties is studied in a medium Mn steel. Nanosized lamellar structures are formed after intercritical annealing at 550 °C for 8 and 16 h; they consist of mainly tempered‐α′ martensite with retained austenite. Many cementite precipitates are observed in the tempered‐α′ martensite matrix and at the high‐angle boundaries. The orientation relationship between θ‐cementite and tempered‐α′ martensite is identified to be ()θ//()tempered‐α′, [011]θ//[011]tempered‐α′, and []θ//[]tempered‐α′. Fresh α′ martensite is detected between the tempered‐α′ martensite and austenite lamellae in the quenched specimens. The fresh α′ martensite is formed due to partial martensitic transformation of austenite upon cooling. The fractions of cementite and fresh α′ martensite increase with extended annealing time, leading to reduced austenite fraction after quenching. Additional baking treatment at 200 °C increases yield stress and elongation due to the stabilization of the austenite. This study provides a detailed understanding of these complex nanosized microstructures and discusses the key factors governing their yield stresses and work hardening behaviors.

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Section: Introductionmentioning

confidence: 99%

Nanosized Lamellar Structures and Tensile Properties of Intercritical‐Annealed Medium Mn Steels Containing Multiphases

Trang

Jeong

Lee

et al. 2022

steel research int.

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“…As a result, medium-Mn steels reveal an ultrafine-grained duplex microstructure consisting of ferrite and a large amount of reversed austenite (20vol%-60vol%) [5]. Numerous studies have emphasized the effects of heat treatment parameters (e.g., annealing temperature [8][9][10][11], annealing time [12][13], heating rate prior to isothermal holding [14], cooling rate after isothermal holding [15][16], primary austenitization [17][18], etc.) on microstructures and mechanical properties in medium-Mn steels.…”

Section: Introductionmentioning

confidence: 99%

Multiphase-field simulation of austenite reversion in medium-Mn steels

Zheng

Gao

et al. 2021

Int J Miner Metall Mater

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Medium-Mn steels have attracted immense attention for automotive applications owing to their outstanding combination of high strength and superior ductility. This steel class is generally characterized by an ultrafine-grained duplex microstructure consisting of ferrite and a large amount of austenite. Such a unique microstructure is processed by intercritical annealing, where austenite reversion occurs in a fine martensitic matrix. In the present study, austenite reversion in a medium-Mn alloy was simulated by the multiphase-field approach using the commercial software MICRESS® coupled with the thermodynamic database TCFE8 and the kinetic database MOBFE2. In particular, a faceted anisotropy model was incorporated to replicate the lamellar morphology of reversed austenite. The simulated microstructural morphology and phase transformation kinetics (indicated by the amount of phase) concurred well with experimental observations by scanning electron microscopy and in situ synchrotron high-energy X-ray diffraction, respectively.

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“…This microstructural feature is used in different types of heat treatments, which usually result in ferrite, bainite, or martensite formation (as a matrix), with some fraction of retained austenite. The typical heat treatment for this grade of steel is the intercritical annealing of cold-rolled steel [ 2 , 3 ]. Here, the formation of a mixture of α + γ phases from low-carbon martensite takes place.…”

Section: Introductionmentioning

confidence: 99%

Dilatometric and Microstructural Study of Martensite Tempering in 4% Mn Steel

Grajcar

Morawiec

Jiménez³

et al. 2020

Materials

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This paper presents the results of martensite tempering resistance in 4% Mn steel. The material was quenched and tempered at 350 °C for 15, 30, and 60 min. The analysis of the quenching and tempering was carried out using dilatometric and microstructural approaches. The phase composition was assessed using X-ray diffraction. The Ms temperature and tempering progress were simulated using JMatPro software. The dilatometric analysis revealed a small decrease in the relative change in length (RCL) during tempering. This decrease was connected to the precipitation kinetics of cementite within the martensite laths. The microstructure investigation using a scanning electron microscope showed a very small amount of carbides, even for the longest tempering time. This showed the high tempering resistance of the martensite in medium-Mn steels. The hardness results showed an insignificant decrease in the hardness depending on the tempering time, which confirmed the high tempering resistance of martensite.

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Effect of the heat treatment on the microstructure and mechanical properties of medium-Mn-steels

Cited by 21 publications

References 42 publications

Nanosized Lamellar Structures and Tensile Properties of Intercritical‐Annealed Medium Mn Steels Containing Multiphases

Nanosized Lamellar Structures and Tensile Properties of Intercritical‐Annealed Medium Mn Steels Containing Multiphases

Multiphase-field simulation of austenite reversion in medium-Mn steels

Dilatometric and Microstructural Study of Martensite Tempering in 4% Mn Steel

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