Austenite growth and stability in medium Mn, medium Al Fe-C-Mn-Al steels

Emo, Jonathan; Maugis, Philippe; Perlade, Astrid

doi:10.1016/j.commatsci.2016.08.041

Cited by 42 publications

(24 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the intercritical annealing temperature was further increased, ferrite and austenite were fully recrystallized, showing equiaxed morphology (Figure 10d), which was generally obtained in cold-rolled medium-Mn steels in the literature [8,15,37,40,41,53]. This equiaxed morphology in cold-rolled medium-Mn steels was explained by the recrystallization.…”

Section: Influence Of Intercritical Annealing Temperature On Microstrsupporting

confidence: 53%

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Song

Zhou

et al. 2018

Metals

View full text Add to dashboard Cite

Medium-Mn steels are characterized by ultrafine-grained (UFG) duplex microstructure consisting of ferrite and a large amount of retained austenite. Intercritical annealing is of great importance to achieving the UFG duplex microstructure and adjusting amount as well as stability of retained austenite. In the present work, the influence of intercritical annealing temperature on the microstructure and mechanical properties was investigated in a cold-rolled medium-Mn steel Fe-12Mn-3Al-0.05C. Particularly, the dependence of microstructural morphology on intercritical annealing temperature was emphasized to reveal the genesis of the microstructural morphology in medium-Mn steels. The ferrite-austenite duplex microstructure manifested an elongated morphology in the specimen annealed at 555 • C, which inherited the lath structure of the cold-rolled state. The medium-Mn steel exhibited a continuous yielding behavior and a relatively low strain-hardening rate. With an increase in intercritical annealing temperature up to 650 • C, the amount of retained austenite increased and microstructure was partially recrystallized, showing a mixture of elongated and equiaxed grain morphologies. When the intercritical annealing was applied at 700 • C, the medium-Mn steel mainly exhibited recrystallized microstructure with equiaxed morphology. The optimal balance between the amount and the stability of retained austenite led to an enhancement of strain hardening and ductility. With a further increase in the intercritical annealing temperature to 750 • C, the medium-Mn steel possessed pronounced strain-hardening behavior at the beginning of the tensile deformation with deteriorated ductility.

show abstract

Section: Influence Of Intercritical Annealing Temperature On Microstrsupporting

confidence: 53%

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Song

Zhou

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…The small thickness of the protective oxide scale (<100 nm) and the presence of the Al2O3-Cr2O3 solid solution indicate a slow oxidation kinetics. The reasons for this phenomenon may reside in the low oxygen solubility/diffusivity and sluggish aluminium diffusion in the austenite phase [102]. Moreover, a linear relationship between the diffraction angle of the (104) peak and the Cr2O3 content in the solid solution was recently reported [103].…”

Section: Discussionmentioning

confidence: 99%

Corrosion resistance and microstructural stability of austenitic Fe–Cr–Al–Ni model alloys exposed to oxygen-containing molten lead

Shi

Jianu

Weisenburger

et al. 2019

Journal of Nuclear Materials

View full text Add to dashboard Cite

The goal of the study was to determine the critical concentrations of Al, Cr and Ni, at which the quaternary Fe-Cr-Al-Ni model alloys, exposed to oxygen-containing molten Pb up to 600°C, are corrosion resistant, while preserving the austenite structure of the alloy matrix. Twelve alloys were designed to meet the above mentioned requirements; six of them showed corrosion resistance and preserved the austenite phase in the alloy bulk, during the exposure at 550°C and 600°C for 1000 hours to molten Pb containing 10-6 wt.% oxygen. Based on experimental results a general formula was substantiated as follows: Fe-(20-29)Ni-(15.2-16.5)Cr-(2.3-4.3)Al (wt.%). In case of temperatures below 550°C, the critical Cr content was 14.4 wt.%. Two corundum-type crystalline structures were identified as the constituent phases of the passivating scales, one being Cr2O3 and the other Al2O3-Cr2O3 solid solution. The average amount of Cr2O3 in the Al2O3-Cr2O3 solid solution, found in the passivating scales of the Fe-Cr-Al-Ni model alloys, was estimated at ≈ 40 wt.% at 550°C and ≈ 35 wt.% at 600°C. A transitional layer, consisting of Fe-and Ni-enriched austenitic matrix and exhibiting randomly distributed intermetallic B2-(Ni,Fe)Al, was formed below the oxide scale up to a depth of two microns. The austenite, as matrix, and Ni3(Al,Fe) as precipitates are the microstructural phases of the bulk alloys after exposure for 1000h at 600°C to oxygen-containing molten Pb.

show abstract

“…In the past, there have been numerous efforts to analyze the impact of annealing parameters during the IA on the initial microstructure and the partitioning of alloying elements on the individual phases [1,[16][17][18][19][20][21][22]. Subsequent studies have dealt with the activation of secondary deformation mechanisms in γ and the strain partitioning in the microstructural constituents of different hardness [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Strain-Rate-Dependent Deformation Behavior and Mechanical Properties of a Multi-Phase Medium-Manganese Steel

Sevsek

Haase

Bleck

2019

Metals

View full text Add to dashboard Cite

The strain-rate-dependent deformation behavior of an intercritically annealed X6MnAl12-3 medium-manganese steel was analyzed with respect to the mechanical properties, activation of deformation-induced martensitic phase transformation, and strain localization behavior. Intercritical annealing at 675 °C for 2 h led to an ultrafine-grained multi-phase microstructure with 45% of mostly equiaxed, recrystallized austenite and 55% ferrite or recovered, lamellar martensite. In-situ digital image correlation methods during tensile tests revealed strain localization behavior during the discontinuous elastic-plastic transition, which was due to the localization of strain in the softer austenite in the early stages of plastic deformation. The dependence of the macroscopic mechanical properties on the strain rate is due to the strain-rate sensitivity of the microscopic deformation behavior. On the one hand, the deformation-induced phase transformation of austenite to martensite showed a clear strain-rate dependency and was partially suppressed at very low and very high strain rates. On the other hand, the strain-rate-dependent relative strength of ferrite and martensite compared to austenite influenced the strain partitioning during plastic deformation, and subsequently, the work-hardening rate. As a result, the tested X6MnAl12-3 medium-manganese steel showed a negative strain-rate sensitivity at very low to medium strain rates and a positive strain-rate sensitivity at medium to high strain rates.

show abstract

Austenite growth and stability in medium Mn, medium Al Fe-C-Mn-Al steels

Cited by 42 publications

References 19 publications

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Influence of Intercritical Annealing Temperature on Microstructure and Mechanical Properties of a Cold-Rolled Medium-Mn Steel

Corrosion resistance and microstructural stability of austenitic Fe–Cr–Al–Ni model alloys exposed to oxygen-containing molten lead

Strain-Rate-Dependent Deformation Behavior and Mechanical Properties of a Multi-Phase Medium-Manganese Steel

Contact Info

Product

Resources

About