Precipitation and dissolution behavior of κ-carbide during continuous heating in Fe-9.3Mn-5.6Al-0.16C lightweight steel

Lee, Suk Jin; Jeong, Junyeong; Lee, Young Kook

doi:10.1016/j.jallcom.2015.06.048

Cited by 24 publications

(13 citation statements)

References 21 publications

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“…The tempered lath martensite shows dense fine intragranular κ-carbide. This is a characteristic morphology of the κcarbide in ferrite-based duplex structure, similar to what is shown by Lee et al [7] in Fe-9.3Mn-5.6Al-0.16C. Most of the carbides are formed in parallel needles and some intersecting one another.…”

Section: Microstructural and Thermodynamic Analysessupporting

confidence: 86%

“…[5,6,8,13] The precipitation of fine κ-carbide within α´martensite in platelet shape in L´1 2 structure has been studied in a ferrite-based duplex medium-manganese steel with 9.3Mn, 5.6Al, and 0.16C (wt%) between the ageing temperature of 270-480 C. Neither intergranular precipitation and nor κ-carbide has been observed above the equilibrium temperature. [7] High aluminum amount does not only increase the content of κ-carbide but also decreases the Young's Modulus and thermal conductivity significantly, [4] causing problems in fast cooling and quenching. This paper investigates the DOI: 10.1002/srin.202100622 Herein, the opportunity of lightweight medium-manganese steel Fe-7Mn-6Al-0.3C for forged components produced without quenching and tempering treatments is explored.…”

Section: Introductionmentioning

confidence: 99%

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Study of Intercritical Annealing in Air‐Cooled Fe‐Mn‐Al‐C Lightweight Forging Steel for Tailoring the Mechanical Properties

Dickert

Suwanpinij

Bleck

2022

steel research int.

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Herein, the opportunity of lightweight medium‐manganese steel Fe‐7Mn‐6Al‐0.3C for forged components produced without quenching and tempering treatments is explored. The selected composition reveals neither cracks nor intergranular coarse κ‐carbide and has a lower density than pure iron by 9%. Despite the massive dimension of the forged bar and decreased thermal conductivity, outstanding mechanical properties can be achieved by air‐cooling followed by intercritical annealing. An intermediate tensile strength of 685 MPa with total elongation of 29% can be achieved by annealing at 800 °C for 1,000 s, whereas an ultimate tensile strength above 1,000 MPa with an elongation of 13% can be reached by forming tempered martensite with fine κ‐carbide at 400 °C.

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Section: Microstructural and Thermodynamic Analysessupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Study of Intercritical Annealing in Air‐Cooled Fe‐Mn‐Al‐C Lightweight Forging Steel for Tailoring the Mechanical Properties

Dickert

Suwanpinij

Bleck

2022

steel research int.

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“…New steel grades are continuously developed to optimize the properties, such as low-density, good mechanical properties, corrosion resistance, and high-temperature oxidation resistance. In particular, since the 1980s, the metallurgical system featured by Fe-Al-Mn-C has been investigated, and a great potential for substituting the Fe-Ni-Cr-C class has been discovered [1,2,3,4,5,6]. Nevertheless, up to now, the specific tensile strength (the ratio between the strength and the density) is lower than the one pointed by the Aluminum alloys or Titanium alloys [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Corrosion and Oxidation Behavior of a Fe-Al-Mn-C Duplex Alloy

et al. 2019

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The low-density steels represent a topic of great interest within the scientific world because of the great demand from the steel market of increasingly lighter materials, also featured by an optimal mix of the mechanical properties. In this work, the corrosion and hot oxidation resistance of a Fe-15%Mn-9.5%Al-6.5%Ni-1%Cr-0.43%C were analyzed and related to the microstructural features. The material behavior was analyzed both in the as-cast and in the heat-treated state. For the corrosion test, the experimental plan was fulfilled using four different concentrations of HCl and four temperatures. In the case of hot oxidation resistance, the exposure time and the temperature effects were evaluated. The corrosion resistance in HCl was comparable to the stainless steel, and the iso-corrosion curves showed excellent resistance of the 1300 °C solution-treated material, especially at low temperatures, but it is also good at high temperatures due to the hot oxidation.

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“…A number of studies have been carried out on medium‐Mn Fe–Mn–Al–C steels containing different Mn, Al, and C contents . According to research on low‐density steels containing 5 mass% Al and different contents of Mn, the M s temperature and grain size of austenite strongly affected its stability in Al‐added low‐density steels.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nb Addition on Microstructure and Mechanical Properties of Medium‐Mn Low‐Density Steels

Zhou

Song

et al. 2018

steel research int.

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The microstructural modifications and mechanical properties are investigated in two kinds of hot-rolled Fe-8Mn-6Al-0.15C (0Nb steel) and Fe-8Mn-6Al-0.15C-0.02Nb (0.02Nb steel) medium-Mn low-density steels, subjected to an intercritical annealing treatment. Two experimental alloys presented an extraordinary bimodal duplex microstructure made of coarse δ-ferrite grains and fine-grained (FG) {intrecritical ferrite þ retained austenite} regions after annealing at 800-1000 C for 1 h. In the 0.02Nb steel annealed at 700 C in particular, martensite lath and niobium-contained M 5 C 2 -type carbides in spherical nanoscale shape are found. The 0.02Nb steel exhibited excellent mechanical properties of tensile strength of 940 MPa and elongation of 36%, which are 11.1% and 12.5% higher than those of 0Nb steel. The addition of Nb in 0.02Nb steel led to partitioning of C and Mn from austenite and retardation of the γ/α transformation. The improvement of the mechanical properties in 0.02Nb steel is mainly attributed to the sufficient transformation induced plasticity (TRIP) effect during tensile behavior resulted from the higher austenite volume fraction and lower austenite stability.

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Precipitation and dissolution behavior of κ-carbide during continuous heating in Fe-9.3Mn-5.6Al-0.16C lightweight steel

Cited by 24 publications

References 21 publications

Study of Intercritical Annealing in Air‐Cooled Fe‐Mn‐Al‐C Lightweight Forging Steel for Tailoring the Mechanical Properties

Study of Intercritical Annealing in Air‐Cooled Fe‐Mn‐Al‐C Lightweight Forging Steel for Tailoring the Mechanical Properties

Corrosion and Oxidation Behavior of a Fe-Al-Mn-C Duplex Alloy

Influence of Nb Addition on Microstructure and Mechanical Properties of Medium‐Mn Low‐Density Steels

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