Influence of carbon content on the microstructure, martensitic transformation and mechanical properties in austenite/ε-martensite dual-phase Fe–Mn–C steels

Seol, Jae Bok; Jung, Jae‐Gil; Jang, Youngjoo; Park, C.G.

doi:10.1016/j.actamat.2012.09.078

Cited by 152 publications

(70 citation statements)

References 75 publications

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“…According to Medvedeva et al in the presence of Mn a Mn-C pair forms that reduces the expected increase in the fault energy that is caused by C alone. [25] Dynamic strain aging is a common observation in medium-Mn steels [4,5,7,10,12,[26][27][28][29][30] with a wide variation in processing. Gibbs et al [10] investigated a 7Mn steel annealed at temperatures varying from 848 K to 948 K (575°C to 675°C) for 168 hours.…”

Section: B Dynamic Strain Agingmentioning

confidence: 99%

Dynamic Strain Aging Phenomena and Tensile Response of Medium-Mn TRIP Steel

Field

Aken

2018

Metall Mater Trans A

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Dynamic strain aging (DSA) and rapid work hardening are typical behaviors observed in medium-Mn transformation-induced plasticity (TRIP) steel. Three alloys with manganese ranging from 10.2 to 13.8 wt pct with calculated room temperature stacking fault energies varying from À 2.1 to 0.7 mJ/m 2 were investigated. Significant serrations were observed in the stress-strain behavior for two of the steels and the addition of 4.6 wt pct chromium was effective in significantly reducing the occurrence of DSA. Addition of chromium to the alloy reduced DSA by precipitation of M 23 (C,N) 6 during batch annealing at 873 K (600°C) for 20 hours. Three distinct DSA mechanisms were identified: one related to manganese ordering in stacking faults associated with e-martensite and austenite interface, with activation energies for the onset and termination of DSA being 145 and 277 kJ/mol. A second mechanism was associated with carbon diffusion in c-austenite where Mn-C bonding added to the total binding energy, and activation energies of 88 and 155 kJ/mol were measured for the onset and termination of DSA. A third mechanism was attributed to dislocation pinning and unpinning by nitrogen in a-ferrite with activation energies of 64 and 123 kJ/mol being identified. Tensile behaviors of the three medium manganese steels were studied in both the hot band and batch annealed after cold working conditions. Ultimate tensile strengths ranged from 1310 to 1404 MPa with total elongation of 24.1 to 34.1 pct. X-ray diffraction (XRD) was used to determine the transformation response of the steels using interrupted tensile tests at room temperature. All three of the processed steels showed evidence of two-stage TRIP where c-austenite first transformed to e-martensite, and subsequently transformed to a-martensite.

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Section: B Dynamic Strain Agingmentioning

confidence: 99%

Dynamic Strain Aging Phenomena and Tensile Response of Medium-Mn TRIP Steel

Field

Aken

2018

Metall Mater Trans A

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“…Some research has indicated that such alloys reveal mainly the TRIPeffect when the manganese contents are lower than 15%, while the TWIP-effect is dominant when manganese contents are higher than 25%. For manganese contents between 15% and 25%, both of the effects coexist [10,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Microstructure And Texture Evolution During Cold-Rolling In The Fe-23Mn-3Si-3Al Alloy

Kowalska¹,

Ratuszek²,

Witkowska³

et al. 2015

Archives of Metallurgy and Materials

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“…[12,14,15] It has been demonstrated that the excellent combination of strength and ductility is achieved because of deformation-induced martensite transformation from austenite (c) to close-packed hexagonal (hcp)-martensite (e) or body-centered cubic/body-centered tetragonal (bcc/bct)-martensite (a¢) during tensile deformation. [14,[16][17][18] Moreover, it is commonly thought that the introduction of thermally stable-retained austenite can improve toughness. [19,20] It is hence possible to develop a novel heavy steel plate with enhanced strength, ductility, and low-temperature impact toughness utilizing Mn element.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatments on the Microstructural Evolution and Resultant Mechanical Properties in a Low Carbon Medium Mn Heavy Steel Plate

Chen

Liu

et al. 2016

Metall Mater Trans A

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In this study, the microstructural evolution and resultant mechanical properties in a low carbon medium Mn heavy steel plate were investigated in detail. The results show that the introduction of medium manganese alloy design in the heavy steel plate has been shown to achieve the outstanding combination of strength, ductility, low-temperature impact toughness, and strain hardening capacity. It has been found that the austenite phase mainly displays at martensitic lath boundaries and shows lath shape for the heat treating at 873 K (600°C) for 1 to 10 hours or 893 K (620°C) for 2 hours, and not all the austenite phase obeys the K-S or N-W orientation relationship with respect to abutting martensitic lath. Although the microstructure in the steel after heat treating at 873 K (600°C) for 1 to 10 hours is similar to each other, the resultant mechanical properties are very different because the volume fraction and stability of retained austenite vary with the heat treatments. The best low-temperature impact toughness is achieved after heat treating at 873 K (600°C) for 2 hours due to the formation of a considerable volume fraction of retained austenite with relatively high stability, but the strain hardening capacity and ductility are disappointing because of insufficient TRIP effect. Based on enhancing TRIP effect, the two methods have been suggested. One is to increase the isothermal holding temperature to 893 K (620°C), and the other one is to prolong the isothermal holding time to 10 hours at 873 K (600°C). The two methods can significantly increase strain hardening capacity and ductility nearly without harming low-temperature impact toughness. In addition, the stability of retained austenite has been discussed by the quantitative analysis and it has been demonstrated that the stability of retained austenite is related to the chemical composition, size, and morphology. Moreover, the isothermal holding temperature has a great effect on the stability of retained austenite, while the effect of the isothermal holding time is relatively poor.

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Influence of carbon content on the microstructure, martensitic transformation and mechanical properties in austenite/ε-martensite dual-phase Fe–Mn–C steels

Cited by 152 publications

References 75 publications

Dynamic Strain Aging Phenomena and Tensile Response of Medium-Mn TRIP Steel

Dynamic Strain Aging Phenomena and Tensile Response of Medium-Mn TRIP Steel

Microstructure And Texture Evolution During Cold-Rolling In The Fe-23Mn-3Si-3Al Alloy

Influence of Heat Treatments on the Microstructural Evolution and Resultant Mechanical Properties in a Low Carbon Medium Mn Heavy Steel Plate

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