κ-carbide hardening in a low-density high-Al high-Mn multiphase steel

Lu, W.J.; Zhang, X.F.; Qin, Rongshan

doi:10.1016/j.matlet.2014.09.104

Cited by 57 publications

(22 citation statements)

References 16 publications

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“…Based on the lattice parameter calculation and crystal structure analysis, the lamellar phase in both steels is found to be κ-carbide with lattice parameter 3.75 Å. [14]. -carbides are surrounded by  phase.…”

Section: The Microstructure-formability Relationshipmentioning

confidence: 95%

“…To this purpose two types of ingot with respective chemical compositions of Fe-26Mn-9Al-0.75C and Fe-34Mn-9Al-0.65C (wt.%) were prepared using induction furnace. The microstructure and Vickers hardness of both steels after various annealing processes have been characterized previously [8,14].…”

Section: The Microstructure-formability Relationshipmentioning

confidence: 99%

“…The Mn compositions in both steels are high enough to affect the specific stacking fault energy. Choosing of an annealing temperature of 700C for Fe-26Mn-9Al-0.75C steel rather than 600 o C was to maximize its - interface fraction [14]. It is impossible to generate different microstructures using two steels with identical chemical compositions and also the same thermomechanical processing conditions.…”

Section: The Microstructure-formability Relationshipmentioning

confidence: 99%

“…The steels with high Mn low Al and high Mn no Al are found free from , with  matrix and in excellent formability 3 [12][13]. κ-carbide appears when Al composition becomes significant in steel [8,[14][15]. The eutectoid reaction in Fe-Mn-Al-C lightweight steels has been studied systematically [16].…”

Section: Introductionmentioning

confidence: 99%

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Influence of κ-carbide interface structure on the formability of lightweight steels

Qin

2016

Materials & Design

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Abstractκ-carbide () in high aluminium (Al) steels is grown from austenite () via + or α+ ( represents ferrite), and is a lamellar structure. This work demonstrates that the formability of high Al lightweight steels is affected by the lattice misfit and interface shape between  and matrix. The cold workability can be improved by either to change the steel chemical constitution or to implement an electro-thermo-mechanical process. For ferrite-matrix-based high Al steel, electric-current promotes the spheroidization and refinement of  structure and reduces volume fraction of  phase. This retards the crack nucleation and propagation, and hence improves the materials formability. The observation is caused by a direct effect of electric-current rather than side effects.

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Section: The Microstructure-formability Relationshipmentioning

confidence: 95%

Section: The Microstructure-formability Relationshipmentioning

confidence: 99%

Section: The Microstructure-formability Relationshipmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of κ-carbide interface structure on the formability of lightweight steels

Qin

2016

Materials & Design

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“…Seol et al [13] found direct evidence for the precipitation of κ-carbides and could confirm the structure and chemical composition of the steel using transmission electron microscopy and atomic probe tomography [13]. Fine and coarse κ-carbide particles are known to enhance the yield and tensile strengths of austenite-based lightweight steels, owing to their precipitation of hardening [16][17][18][19]. However, ferrite-based steels show poor mechanical properties during hot-and cold-rolling [20][21][22].…”

Section: Introductionmentioning

confidence: 98%

Effects of Phase Evolution on Mechanical Properties of Laser-Welded Ferritic Fe-Al-Mn-C Steel

Kang

Kim

Han

et al. 2017

Metals

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Abstract:In the present study, the evolution of microstructure in laser-welded joints of ferrite-based dual-phase Fe-Al-Mn-C steel sheets was analyzed and its effect on the mechanical properties of the joints was investigated. Laser welding was performed using different powers and welding speeds to attain different heat inputs. Electron backscatter diffraction (EBSD) examinations and hardness measurements were used to characterize the microstructure of the welds. The tensile properties were found to depend on the heat input, but joint strength exceeding that of the base metal (BM) were obtained at low heat inputs. However, the fracture location shifted from the base metal to the heat-affected zone (HAZ) as the heat input was increased. The HAZ consisted of a mixture of austenite, ferrite and martensite, and its width increased with increasing the heat input. It was supposed that the incompatibility between the ferrite, austenite and martensite phases led to early void formation and fracturing of the phase interfaces in the wide HAZ.

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Superior High‐Temperature Properties of Low‐Density Steel Enabled by a Tunable Hierarchical Microstructure

Zhao

et al. 2022

Adv Eng Mater

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The tensile properties, microstructure characteristics, and fracture mechanisms at 500 °C of Fe–Mn–Al–C–Mo–V steel processed by hot rolling (HR) and warm rolling (WR) are investigated. The HR steel obtained by rolling 1150 °C, consisting mainly of equiaxed austenite and banded ferrite, exhibits a tensile strength of 695 MPa, accompanied by an elongation of ≈45.5%. In contrast, the WR steel processed by rolling at 750 °C shows a hierarchical microstructure that consists mainly of lamellar ferrite/austenite + fine carbides, rendering a significantly increased tensile strength to 1040 MPa and an excellent elongation to ≈20.0%. This is mainly attributed to the remarkable refinement of ferrite and austenite in the WR steel, strengthening finely dispersed carbides, and obtaining numerous low‐angle grain boundaries in the matrix. The tensile fracture morphology is a ductile failure in both types of steel. The fracture of HR steel is attributed to the cracks enabled by the austenite localized slip deformation in the austenite and the fracture of the precipitates; the failure of the WR steel is mainly ascribed to the cracking along the lamellar structure due to the κ‐carbides pinning lamellar ferrite phase boundary leading to high strain localization.

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κ-carbide hardening in a low-density high-Al high-Mn multiphase steel

Cited by 57 publications

References 16 publications

Influence of κ-carbide interface structure on the formability of lightweight steels

Influence of κ-carbide interface structure on the formability of lightweight steels

Effects of Phase Evolution on Mechanical Properties of Laser-Welded Ferritic Fe-Al-Mn-C Steel

Superior High‐Temperature Properties of Low‐Density Steel Enabled by a Tunable Hierarchical Microstructure

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