Medium Mn transformation-induced plasticity steels: Recent progress and challenges

Suh, Dong‐Woo; Kim, Sung-Joon

doi:10.1016/j.scriptamat.2016.07.013

Cited by 279 publications

(101 citation statements)

References 47 publications

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“…This plastic instability phenomenon has been reported for some TRIP steels 21) and despite many subjects in the heterogeneous deformation in Mn medium steels are unclear, some authors related this phenomenon to the initial microstructure and annealing temperature influence. 22) Performing the annealing from a martensitic microstructure, a decrease in the deformation associated to the Lüders bands has been verified when compared to annealing after cold rolling 23) due to a strain partitioning between ferrite and austenite or if the ferrite contains more carbon solutes in the last case.…”

Section: Resultsmentioning

confidence: 91%

Ultrafinegrained Microstructure in a Medium Manganese Steel after Warm Rolling without Intercritical Annealing

et al. 2017

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Medium manganese steels are a grade of the third generation of advanced high strength steels (AHSS) that combine ductility, high strength and toughness for crashing resistance, determining characteristics for application in the automotive industry. During processing these steels are subjected to a hot and cold rolling followed by intercritical annealing in the field of austenite and ferrite phases. On the other side, the warm rolling processing is capable to reduce costs and operating time due to a single operation. The aim of this work was to follow, along warm rolling, the microstructure evolution. This aim was realized by optical and scanning electron microscopy analysis, X-ray diffraction, Vickers microhardness and EBSD technique in an 8Mn-0.08C steel. A very refined and deformed microstructure in warm-rolled condition was obtained, with a higher volume fraction of retained austenite without hot-rolled as previous processing step, which result in high tensile strength and total elongation. The texture shows a greater intensity of the α-fiber components as a function of higher strain in this thermomechanical processing.

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Section: Resultsmentioning

confidence: 91%

Ultrafinegrained Microstructure in a Medium Manganese Steel after Warm Rolling without Intercritical Annealing

et al. 2017

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“…The most common alloy systems of medium-Mn steels include Fe-Mn-C system [8][9][10][11], Fe-Mn-Al-C system [12,13] and Fe-Mn-Al-Si-C system [14][15][16]. In contrast to the microstructure of the first-generation and second-generation AHSS, medium-Mn steels are characterized by ultrafine-grained (UFG) duplex microstructure containing ferrite and a large amount of retained austenite [7,9,11,[17][18][19]. In literature, the ferrite-austenite duplex microstructure has been intensively studied in duplex stainless steels [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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

Song

Zhou

et al. 2018

Metals

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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.

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“…Medium Mn steel is a promising candidate in the 3rd generation AHSSs due to its excellent combination of strength and ductility [2][3][4][5][6][7]. In general, medium Mn steel has a dual-phase microstructure with retained austenite grains embeded in the ferrite matrix [4,5].…”

Section: Introductionmentioning

confidence: 99%

Strong and ductile medium Mn steel without transformation-induced plasticity effect

Huang

2018

Materials Research Letters

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The conventional alloy design of medium Mn steel is to optimize the transformation-induced plasticity (TRIP) effect. Here we show that a dual-phase heterogeneous structure is sufficient to develop a medium Mn steel with high yield strength ( ∼ 1.2 GPa) and large uniform elongation ( ∼ 14.5%). The ultra-high strength is contributed by high back-stress while the large ductility is induced by strain-gradient plasticity and back-stress hardening, both of which are inherent to dual-phase heterogeneous structure. TRIP effect is suppressed during plastic deformation. Therefore, medium Mn steel can be strong and ductile by engineering dual-phase heterogeneous structure without resorting to TRIP effect. IMPACT STATEMENTWe demonstrate that medium Mn steel can be strong and ductile by engineering dual-phase heterogeneous structure without resorting to the conventional transformation-induced plasticity (TRIP) effect. ARTICLE HISTORY

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Medium Mn transformation-induced plasticity steels: Recent progress and challenges

Cited by 279 publications

References 47 publications

Ultrafinegrained Microstructure in a Medium Manganese Steel after Warm Rolling without Intercritical Annealing

Ultrafinegrained Microstructure in a Medium Manganese Steel after Warm Rolling without Intercritical Annealing

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

Strong and ductile medium Mn steel without transformation-induced plasticity effect

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