Formation of Retainted Austenite and Mechanical Properties of 4~8%Mn Hot Rolled TRIP Steels

Kim, D E; Park, Y K; Lee, O Y; Jin, Kongjie; Kim, S J

doi:10.3740/mrsk.2005.15.2.115

Cited by 9 publications

(5 citation statements)

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“…The high austenite volume fractions measured in the final microstructure, particularly in the QT15 condition, are comparable with values reported for intercritically annealed medium Mn steels [6][7][8]. In fact, some of the characteristics of the thermal treatments applied in the present work resemble the intercritical annealing of medium Mn steels (mainly the application of the partitioning in the intercritical domain).…”

Section: Microstructure During Qandp Cyclessupporting

confidence: 86%

“…Medium Mn steels contain a rather high volume fraction of retained austenite, in the range of 0.20-0.40 [6][7][8]. The stability of retained austenite and the ultra-fine microstructure 1.…”

Section: Introductionmentioning

confidence: 99%

“…This means that there are other factors that allow such stabilization. In many publications on medium Mn steels, the austenite stability is explained by Mn partitioning between ferrite and austenite during long-term soaking in the intercritical temperature range [4,8,47]. However, some investigations demonstrate that Mn partitioning occurs also in short annealing periods.…”

mentioning

confidence: 99%

“…Laboratory manufacturing of steel samplesStep Obtaining Ac3, CCR, QT25, QT15 and ART start temperature by dilatometryStep Application of Q&P cycles employing laboratory furnaces and salt baths (experiments[1][2][3][4][5][6][7][8] …”

mentioning

confidence: 99%

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Characterization of a Medium Mn-Ni Steel Q&P Treated by a High Partitioning Temperature Cycle

Arribas

Molino

Gutiérrez

et al. 2022

Metals

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In this work, a medium Mn-Ni steel was treated through Quenching and Partitioning (Q&P) with a partitioning temperature (PT) of 650 °C, which corresponded to the start of the austenite reverse transformation (ART) phenomenon. The influence of the quenching temperature (QT) and partitioning time (Pt) on austenite stabilization and mechanical properties was investigated. A strong influence of the quenching temperature was observed. Results were compared with those obtained after a Q&P treatment with 400 °C partitioning temperature. The Q&P cycle with quenching to room temperature and a high partitioning temperature produced a steel with a high retained austenite (RA) volume fraction and exceptional strength–ductility balance. The analysis of the mechanical stability of the retained austenite revealed a significant stress-induced transformation. Nevertheless, the austenite, which was stable at stresses above the yield stress, provided significant TRIP-assisted ductility. Bending, hole expansion and post-stamping properties were also evaluated for the most promising conditions.

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Section: Microstructure During Qandp Cyclessupporting

confidence: 86%

“…Medium Mn steels contain a rather high volume fraction of retained austenite, in the range of 0.20-0.40 [6][7][8]. The stability of retained austenite and the ultra-fine microstructure 1.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Characterization of a Medium Mn-Ni Steel Q&P Treated by a High Partitioning Temperature Cycle

Arribas

Molino

Gutiérrez

et al. 2022

Metals

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“…[6] Austenite stabilization can be achieved through diffusion of substitutional elements, such as Mn and Ni, into austenite during high-temperature processing, [7,8] resulting in rather high contents of RA (20 to 40 pct). [9][10][11] The stability of RA and the ultra-fine microstructure in MMnS play a key role in the impressive strength/ductility balance of these steels. [12][13][14] Relatively moderate amounts of Mn (4 to 10 pct) are added to promote austenite stabilization.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ni and Process Parameters in Medium Mn Steels Heat Treated by High Partitioning Temperature Q&P Cycles

Molino

Telleria

Gilliams

et al. 2022

Metall Mater Trans A

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In this work, two medium Mn steels (5.8 and 5.7 wt pct Mn) were subjected to a quenching and partitioning (Q&P) treatment employing a partitioning temperature which corresponded to the start of austenite reverse transformation (ART). The influence of a 1.6 wt pct Ni addition in one of the steels and cycle parameters on austenite stability and mechanical properties was also studied. High contents of retained austenite were obtained in the lower quenching temperature (QT) condition, which at the same time resulted in a finer microstructure. The addition of Ni was effective in stabilizing higher contents of austenite. The partitioning of Mn and Ni from martensite into austenite was observed by TEM–EDS. The partitioning behaviour of Mn depended on the QT condition. The lower QT condition facilitated Mn enrichment of austenite laths during partitioning and stabilization of a higher content of austenite. The medium Mn steel containing Ni showed outstanding values of the product of tensile strength (TS) and total elongation (TEL) in the lower QT condition and a higher mechanical stability of the austenite.

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Prediction of tensile properties of intercritically annealed Al-containing 0.19C–4.5Mn (wt%) TRIP steels

et al. 2016

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Formation of Retainted Austenite and Mechanical Properties of 4~8%Mn Hot Rolled TRIP Steels

Cited by 9 publications

References 0 publications

Characterization of a Medium Mn-Ni Steel Q&P Treated by a High Partitioning Temperature Cycle

Characterization of a Medium Mn-Ni Steel Q&P Treated by a High Partitioning Temperature Cycle

Influence of Ni and Process Parameters in Medium Mn Steels Heat Treated by High Partitioning Temperature Q&P Cycles

Prediction of tensile properties of intercritically annealed Al-containing 0.19C–4.5Mn (wt%) TRIP steels

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