Analysis of medium manganese steel through cold-rolling and intercritical annealing or warm-rolling

Magalhães, Aline Silva; Santos, Carlos Eduardo dos; Ferreira, Aline Oliveira Vasconcelos; Alves, Davi Silva; Santos, Dagoberto Brandão

doi:10.1080/02670836.2018.1463613

Cited by 16 publications

(11 citation statements)

References 56 publications

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“…As shown in Figure 9, the partitioning of C and Mn to austenite during warm rolling was confirmed, implying that the austenite with higher stability can resist severe deformation. Such warm rolling-induced partitioning was also reported by Magalhães et al [11,12]. It is worth noting that, at a higher working temperature above Ac 3 , hot rolling fails to facilitate the enrichment of austenite stabilizers in austenite by partitioning, owing to the formation of a single-phase austenite microstructure during rolling, which serves as an explanation for the lower stability of the austenite originating from hot rolling and the massive martensite transformation during subsequent cooling, as mentioned above.…”

Section: Influencing Factors Of Chemical Composition and Processing On The Austenite Reversion In Mmnssupporting

confidence: 69%

“…The microstructure produced by warm rolling can result in the desired mechanical properties in MMnS. In the analysis of MMnS by Magalhães et al [12], a Fe-0.086C-8Mn-0.14Si MMnS ingot was subjected to the processing routes of "cold rolling + intercritical annealing" and "warm rolling". It was shown that although both processes exhibited refined microstructures, warm rolling offered a slightly more significant volume fraction of austenite (34 vol.%) compared with the intercritical annealed specimen (29 vol.%), which accounted for the desirable higher work-hardening rate.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the Austenite Fraction of a Cu and Ni Containing Medium-Mn Steel via Warm Rolling

Shen

et al. 2021

Metals

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Developing medium-Mn steels (MMnS) demands a better understanding of the microstructure evolution during thermo-mechanical treatments (TMTs). This study demonstrates the relationship among processing, microstructure, and mechanical properties of a warm-rolled medium-Mn steel (MMnS) containing 1.5 wt. % Cu and 1.5 wt. % Ni. After short-time warm rolling (WR) in an intercritical temperature range, a significant quantity (40.6 vol.%) of austenite was reverted and retained after air cooling. The microstructure and tensile properties of the WR specimens were compared with two typical process routes, namely hot rolling+ cold rolling+ annealing+ tempering (CRAT) and warm rolling+ annealing+ tempering (WRAT). The WR specimen exhibited comparable tensile properties with the CRAT specimens (967 MPa yield strength, 1155 MPa tensile strength, 23% total elongation), with a remarkably shortened process route, which was derived from the dislocation accumulation and austenite reversion during rolling. The WR route stands out among the traditional CRAT and the extended WRAT routes for its excellent tensile properties and compact processing route.

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Section: Influencing Factors Of Chemical Composition and Processing On The Austenite Reversion In Mmnssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Tailoring the Austenite Fraction of a Cu and Ni Containing Medium-Mn Steel via Warm Rolling

Shen

et al. 2021

Metals

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“…In the deformation process, the metastable austenite exhibits a transformation-induced plasticity (TRIP) effect or a twinning-induced plasticity (TWIP) effect, which gives the medium-Mn steel excellent plasticity without sacrificing strength. This allows the material to meet the processing requirement for automobile parts with complex structures [5,6,7,8]. Therefore, the amount of retained austenitein medium-Mn steels determine show extensive is the TRIP effect; that is, the transformation of retained austenite into martensite during deformation increases the strength and ductility of steel simultaneously [1,2,3,4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Hot- Rolled and Cold-Rolled Medium-Mn TRIP Steels

et al. 2018

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This study investigated the microstructure and mechanical properties of hot-rolled and cold-rolled medium-Mn transformation-induced plasticity (TRIP) steel. The experimental steel, processed by quenching and tempering (Q & T) heat treatment, exhibited excellent mechanical properties for hot-rolled and Q & T steels (strength of 1050–1130 MPa and ductility of 16–34%), as well as for cold-rolled and Q & T steels (strength of 878–1373 MPa and ductility of 18–40%). The mechanical properties obtained after isothermal holding at 775 °C for one hour for cold-rolled/Q & T steel were superior to that of hot-rolled/Q & T steel. Excellent mechanical properties were attributed to the large amount of retained austenite, which produced a discontinuous TRIP effect. Additionally, the differences in mechanical properties correlated with the morphology, stability and content of retained austenite. The cold-rolled sample, quenched from 650 °C (CR 650°C) had extensive TRIP effects in the middle and late stages of the deformation, leading to better mechanical properties. The fracture modes of the hot-rolled sample, quenched from 650 °C, and the cold-rolled sample quenched from 650 °C, were ductile fractures, resulting in excellent ductility.

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“…In this case, the product of UTS and TE of approximately 25,000 MPa% is achievable. These steels will be used in the near future mainly as a side and anti-intrusion car body reinforcement structures (A, B, and C pillars, fenders, etc.,) [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Austenite Decomposition of a Lean Medium Mn Steel Suitable for Quenching and Partitioning Process: Comparison of CCT and DCCT Diagram and Their Microstructural Changes

et al. 2022

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The present work deals with the dilatometric study of a hot-rolled 0.2C3Mn1.5Si lean medium Mn steel, mainly suitable for the quenching and partitioning (Q&P) heat treatment in both hot-rolled or cold-rolled condition, subjected to a variation of austenitization temperature. These investigations were performed in a temperature range of 800–1200 °C. In this context, the martensite transformation start temperature (Ms) was determined as a function of austenitization temperature and in turn obtained prior austenite grain size (PAGS). The results show rise in prior austenite grain size due to increasing austenitization temperature, resulting in elevated Ms temperatures. Measured dilatation curves were confronted with the metallographic analysis by means of scanning electron microscopy (SEM). The present paper also focuses on the construction of a continuous cooling transformation (CCT) and deformation continuous cooling transformation (DCCT) diagram of the investigated lean medium Mn steel in a range of cooling rates from 100 to 0.01 °C/s and their subsequent comparison. By comparing these two diagrams, we observed an overall shift of the DCCT diagram to shorter times compared to the CCT diagram, which represents an earlier formation of phase transformations with respect to the individual cooling rates. Moreover, the determination of individual phase fractions in the CCT and DCCT mode revealed that the growth stage of ferrite and bainite is decelerated by deformation, especially for intermediate cooling rates. Microstructural changes corresponding to cooling were also observed using SEM to provide more detailed investigation of the structure and present phases identification as a function of cooling rate. Moreover, the volume fractions obtained from the saturation magnetization method (SMM) are compared with data from X-ray diffraction (XRD) measurements. The discussion of the data suggests that magnetization measurements lead to more reliable results and a more sensitive detection of the retained austenite than XRD measurements. In that regard, the volume fraction of retained austenite increased with a decrease of cooling rate as a result of larger volume fraction of ferrite and bainite. The hardness of the samples subjected to the deformation was slightly higher compared to non-deformed samples. The reason for this was an evident grain refinement after deformation.

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Analysis of medium manganese steel through cold-rolling and intercritical annealing or warm-rolling

Cited by 16 publications

References 56 publications

Tailoring the Austenite Fraction of a Cu and Ni Containing Medium-Mn Steel via Warm Rolling

Tailoring the Austenite Fraction of a Cu and Ni Containing Medium-Mn Steel via Warm Rolling

Microstructure and Mechanical Properties of Hot- Rolled and Cold-Rolled Medium-Mn TRIP Steels

Austenite Decomposition of a Lean Medium Mn Steel Suitable for Quenching and Partitioning Process: Comparison of CCT and DCCT Diagram and Their Microstructural Changes

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