Characterization of Microstructures and Mechanical Properties of Cold-rolled Medium-Mn Steels with Different Annealing Processes

Hu, Jun; Cao, Wenquan; Huang, Chongxiang; Wang, Cun‐Yu; Han, Dong; Li, Jian

doi:10.2355/isijinternational.isijint-2015-187

Cited by 23 publications

(8 citation statements)

References 34 publications

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“…Many alloying concepts are relying on the effect of transformation-induced plasticity (TRIP) of austenite to achieve the target of high strength and high ductility. Examples include quenching and partitioning steels [3,4], medium manganese TRIP steels [5,6], and lowdensity δ-TRIP steels [7,8]. The metastable austenite transforms gradually into martensite during deformation [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Examples include quenching and partitioning steels [3,4], medium manganese TRIP steels [5,6], and lowdensity δ-TRIP steels [7,8]. The metastable austenite transforms gradually into martensite during deformation [3][4][5][6][7][8]. The formation of martensite sustains the work hardening and improves the ductility by delaying the necking during deformation [9].…”

Section: Introductionmentioning

confidence: 99%

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A carbide-free bainitic steel with high-ductility by dynamic transformation during coiling process

Zhao

Chen

et al. 2020

Materials Science and Technology

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A new hot-rolled alloy of carbide-free bainite has been proposed for heavy trucks frames. It involves dynamic bainite transformation during the prolonged cooling of the coiling process after hot-rolling. The new hot-rolled Fe-0.5C-2.9Mn-2.3Al (in wt-%) steels exhibit tensile strength of 1110 MPa with a combined total elongation of 35%. The alloy has been re-heat-treated with one step and two steps isothermal bainitic transformation to study the effect of microstructure evolution and microstructure-property relationship. The transformation-induced plasticity (TRIP) effect of retained austenite has been discussed and revealed as the main contributor for the high ductility of bainitic steels. The formation of the cracks at fracture regions after tensile deformation, which is associated with the austenite stability and morphology, has been observed and discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A carbide-free bainitic steel with high-ductility by dynamic transformation during coiling process

Zhao

Chen

et al. 2020

Materials Science and Technology

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“…Annealing Conditions Table 3 shows that the concentration of carbon in austenite (C γ ) decreases with increasing in annealing time, presumably because this behavior is paralleled by an increase in the γ volume fraction (γ R ). The product of these two values (γ R × C γ ) 39) serves as an index of the degree to which the carbon dissolved in the steel is localized within the austenite: its maximum value (0.1) derives from its compositional weight (0.1%). 40) The γ R × C γ of UFG ferrite-austenite steels ranges from 0.033-0.057 when obtained from M, suggesting a large proportion of the carbon remained dissolved in martensite matrix.…”

Section: Change In Austenite Stability With Intercriticalmentioning

confidence: 99%

Effect of Prior Structure to Intercritical Annealing on Rapid Formation of Ultrafine Ferrite + Austenite Structure and Mechanical Properties in 0.1%C-2%Si-5%Mn Steels

et al. 2020

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Ultrafine ferrite + austenite steels with the chemical composition of 0.1%C-2%Si-5wt%Mn show excellent strength (TS = 1 200 MPa) and high ductility (TEl = 25%) balance, compared to conventional TRIP steels. This steel is expected as the third generation advanced high-tensile strength steels (AHSS). This steel can be produced by a simple intercritical annealing, however, longer annealing time is necessary to obtain appropriate ferrite + austenite structure. It is difficult to produce this steel by continuous annealing process. If the annealing time can be drastically reduced, this new TRIP steels can be commercialized. We focused on the effect of the prior microstructures before annealing on the formation of ferrite + austenite structure. The effect of the prior structure is not clear. Therefore, in this study, two kind of prior structures, ultrafine grained ferrite + cementite and martensite were used in 0.1%C-2%Si-5wt%Mn steels. It was found that the prior structure of ferrite + cementite can form large amount (20%) of austenite in a very short time (600 s). This is because cementite finely dispersed in the structure effectively acts as a preferential nucleation site of reverse transformed austenite and C and Mn are concentrated in cementite to enable a short time formation of austenite. Excellent strength-ductility balance (32 000 MPa%) which is superior to conventional TRIP steels is also obtained.

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“…And the batch annealing is not possible to account for the accuracy of the temperature profile in practice. The Mn-TRIP steels are developing by the other microstructure evolution that manganese partitioning during the transformation from severe deformed martensite and short isothermal holding within several minutes [45,[47][48][49]. This could be applied for commercial available continuous annealing lines (CAL) with temperature tolerance less than ±10°C.…”

Section: Mn-tripmentioning

confidence: 99%

Challenges in the formability of the next generation of automotive steel sheets

Sun

Xiong³

2018

Materials Science and Technology

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Improving strength may lightweight car bodies by thinning the structure gauge while bearing the same crash loads. Development of the third generation advanced high-strength steels aiming to boost material ductility to over 30% total elongation has become the common sense of potential solutions for stamping. Not only total elongation but also several other parameters, involving presswork hardening, anisotropy ratio, strain rate sensitivity, uniform elongation, edge sensitivity and internal stress between phases, are critical in determining the formability under the complex stress and strain distributions during stamping. We clarify here the logic of formability and difficulties in this context of three types of steel: quenching and partitioning, δ-transformation-induced plasticity and medium Mn-TRIP.

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Characterization of Microstructures and Mechanical Properties of Cold-rolled Medium-Mn Steels with Different Annealing Processes

Cited by 23 publications

References 34 publications

A carbide-free bainitic steel with high-ductility by dynamic transformation during coiling process

A carbide-free bainitic steel with high-ductility by dynamic transformation during coiling process

Effect of Prior Structure to Intercritical Annealing on Rapid Formation of Ultrafine Ferrite + Austenite Structure and Mechanical Properties in 0.1%C-2%Si-5%Mn Steels

Challenges in the formability of the next generation of automotive steel sheets

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