Toughness enhancing mechanisms in age hardened Fe–Mn–Al–C steels

Ley, Nathan A.; Young, Marcus L.; Hornbuckle, B.C.; Field, Daniel; Limmer, Krista R.

doi:10.1016/j.msea.2021.141518

Cited by 18 publications

(9 citation statements)

References 29 publications

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“…The greater work hardening condition provides more area under the curve with an improved yield strength 850 MPa. This is consistent with the results presented by Ley et al [ 26 ]. They showed through synchrotron x-ray diffraction that the toughness, as measured by Charpy v-notch impact testing, was doubled without a loss of strength when the heat treatment was designed, such that sideband formation was reduced.…”

Section: Discussionsupporting

confidence: 94%

“…It has been well established that age hardening of metallic alloys is typically controlled by three factors: (1) the degree of super saturation, (2) the vacancy concentration, and (3) the diffusion distance and path [25]. The lowest STQ temperature used in this study was 1173 K, which is 50 K greater than the maximum κ-carbide dissolution temperature recorded for this alloy through in situ synchrotron analysis by Ley et al [26]. These results indicate that κ-carbide was in the solution at the STQ temperature.…”

Section: Discussionmentioning

confidence: 73%

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Alloy Partitioning Effect on Strength and Toughness of κ-Carbide Strengthened Steels

et al. 2022

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Alloy partitioning during heat treatment in a lightweight precipitation hardened steel was investigated using transmission electron microscopy and atom probe tomography. The mechanical properties are discussed as a function of the effect of solution treatment temperature and aging time, giving rise to variations in chemical modulation. A wrought lightweight steel alloy with a nominal composition of Fe-30Mn-9Al-1Si-1C-0.5Mo (wt. %) was solution-treated between 1173–1273 K and aged at 773 K. Lower solution treatment temperatures retained a finer grain size and accelerated age hardening response that also produced an improved work hardening behavior with a tensile strength of −1460 MPa at 0.4 true strain. Atom probe tomography indicated these conditions also had reduced modulation in the Si and Al content due to the reduced aging time preventing silicon from diffusing out of the κ-carbide into the austenite. This work provides the framework for heat-treating lightweight, age hardenable steels with high strength and improved energy absorption.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 73%

Alloy Partitioning Effect on Strength and Toughness of κ-Carbide Strengthened Steels

et al. 2022

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“…Apart from sheet steel, plate applications for bridges, pressure vessels [54] and armour [55] have also been explored. Medium Mn steel in the form of half-inch plates [56,57] and heavy steel plates (>3 inch) [54] have been developed in the literature with high strength and high toughness, even at cryogenic temperatures.…”

Section: Motivation For Medium Mn Steelsmentioning

confidence: 99%

A review of the processing, microstructure and property relationships in medium Mn steels

Kwok

Dye

2023

International Materials Reviews

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Medium Mn steels are an emerging class of 3rd generation advanced high-strength steels. These steels have received significant attention due to their high strengths, large ductilities and also lower cost compared to their predecessor high Mn Twinning Induced Plasticity (TWIP) steels. Additionally, medium Mn steels have been found to exhibit TWIP and/or Transformation Induced Plasticity (TRIP) effects which can be harnessed to give a high strain hardening rate. Many thermomechanical processing concepts in the literature have been developed, producing multiple microstructure types with differentmechanical properties. The present review therefore aims to summarise the current knowledge of medium Mn steel alloy design especially on the processing, microstructure and property relationships in medium Mn steels. It complements the review of Sun et al. [Physical metallurgy of medium-Mn advanced high-strength steels, Int Mater Rev. 2023.], written independently and in parallel, which focusses more on the phase interfaces and thermodynamics.

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“…Aluminum is often used as a deoxidizer in many low- and medium-alloy steels with a small addition because of its easy oxidation characteristics [ 1 ], it is also used as a main alloying element in steels with high alloy content, such as FeMnAlC steel systems [ 2 , 3 ]. Addition of Al decreases the density and Young’s modulus [ 4 , 5 ], increases the strength [ 6 , 7 ], increases the SFE [ 8 ], which alters the deformation mechanisms [ 9 , 10 ], increasing the onset for the TRIP and the TWIP effects [ 11 ], and changes the hardening mechanism [ 12 , 13 ], affects the corrosion resistance [ 14 , 15 ] and oxidation resistance [ 16 ], and so on [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Al Additions and Cooling Rate on the Microstructure and Mechanical Properties of Austenite FeMnAlC Steels

et al. 2022

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The precipitation behavior of κ-carbide and its effects on mechanical properties in Fe-30Mn-xAl-1C (x = 7–11%) steels under water quenching and furnace cooling are studied in the present paper. TEM, XRD, EPMA were employed to characterize the microstructure, and tensile test and the Charpy impact test were used to evaluate mechanical properties. The results show that the density decreases by 0.1 g/cm3 for every 1 wt.% of Al addition. The excellent mechanical properties of tensile strength of 880 MPa and impact absorption energy of 120–220 J at −40 °C with V notch were obtained, with both solid solution and precipitation strengthening results in the yield strength increasing by about 57.5 MPa with per 1% Al addition in water-quenched samples. The increasing of yield strength of furnace-cooled samples comes from the relative strengthening of κ-carbides, and the strengthening potential reaches 107–467 MPa. The lower the cooling rate, the easier it is to promote the precipitation of κ-carbides and the formation of ferrite. The partitioning of C, Mn, Al determines the formation of κ-carbides at a given Al addition, and element partition makes the κ-carbides sufficiently easy to precipitate at a low cooling rate. The precipitation of κ-carbides improves strength and does not significantly reduce the elongation, but significantly reduces the impact absorption energy when Al addition ≥ 8%.

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Toughness enhancing mechanisms in age hardened Fe–Mn–Al–C steels

Cited by 18 publications

References 29 publications

Alloy Partitioning Effect on Strength and Toughness of κ-Carbide Strengthened Steels

Alloy Partitioning Effect on Strength and Toughness of κ-Carbide Strengthened Steels

A review of the processing, microstructure and property relationships in medium Mn steels

Effect of Al Additions and Cooling Rate on the Microstructure and Mechanical Properties of Austenite FeMnAlC Steels

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