Microstructural evolution and mechanical properties of hot-rolled 11% manganese TRIP steel

Cai, Zhiping; Ding, Hua; Xue, X.; Xin, Qibin

doi:10.1016/j.msea.2012.09.083

Cited by 74 publications

(37 citation statements)

References 23 publications

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“…The formation of austenite is usually accompanied by the partition of Mn between ferrite and austenite. 13,[16][17][18][19][20] Furthermore, a higher density of dislocations in the austenite warm rolled retains the carbon atoms at this stage, since this element segregates to those imperfections. [7][8][9][10] At higher temperatures, the austenite has a lower chemical stability due to the lower concentration of carbon, therefore, in further cooling, the austenite is right away turned into ferrite and/or martensite, depending on the cooling rate; making it difficult to keep the austenite in the microstructure.…”

Section: Resultsmentioning

confidence: 99%

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: 99%

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

et al. 2017

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“…The "austenite reverted transformation" (ART) heat treatment was adopted by the majority of medium Mn-content steels [18][19][20], but it was proven to be not applicable to the experimental steels, thus, a more convenient quenching and tempering (Q&T) proposed by Cai [21,22] was introduced. Firstly, the as-hot-rolled samples were annealed in the two-phase region for 1 h, followed by an immediate water quenching.…”

Section: Methodsmentioning

confidence: 99%

Mechanical properties and austenite stability in hot-rolled 0.2C–1.6/3.2Al–6Mn–Fe TRIP steel

Ding

Cai

2015

Materials Science and Engineering: A

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“…For steels containing 5 to 12 pct Mn, intercritical annealing, following the cold rolling of the martensitic microstructure, is investigated as a means of stabilizing the austenite by carbon and Mn partitioning. [7][8][9][10][11][12] The retained austenite fraction and stability depend, therefore, on the intercritical annealing temperature and time.Solute partitioning during intercritical annealing in medium-Mn steels has been investigated recently. Most of the research work is concerned with experimental determination of austenite volume fraction and composition.…”

mentioning

confidence: 99%

“…The selected composition was based on the role of alloying elements and an equilibrium thermodynamic analysis that was discussed in recent work. [11] A 40 kg experimental steel ingot was cast after melting the steel in a vacuum induction furnace. The ingot was heated at 1473 K (1200°C) for 2 hours, hot forged into rods of section size 100 mm 9 30 mm, and then air cooled to room temperature (RT).…”

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Kinetics of Solute Partitioning During Intercritical Annealing of a Medium-Mn Steel

Kamoutsi

Gioti

Haidemenopoulos

et al. 2015

Metall Mater Trans A

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The evolution of austenite fraction and solute partitioning (Mn, Al, and C) during intercritical annealing was calculated for a medium-Mn steel containing 11 pct Mn. Austenite growth takes place in three stages. The first stage is growth under non-partitioning local equilibrium (NPLE) controlled by carbon diffusion in ferrite. The second stage is growth under partitioning local equilibrium (PLE) controlled by diffusion of Mn in ferrite. The third stage is shrinkage of austenite under PLE controlled by diffusion of Mn in austenite. During PLE growth, the austenite is progressively enriched in Mn. Compositional spikes evolve early during NPLE growth and broaden with annealing temperature and time.The 3rd generation, medium-Mn, and advanced high-strength steels are under intense investigation as a substitute to 1st (low alloy) and 2nd generation (high-Mn) steels. These steels aim at improved combinations of strength and ductility. [1][2][3][4] In medium-Mn steels, the Mn content is reduced, relative to the high-Mn steels, in the range between 3 and 12 pct and the microstructure consists of an ultrafine ferrite-austenite mixture. The transformation-induced plasticity (TRIP) of the retained austenite is responsible for the enhanced formability in these steels. Several processing routes have been developed in order to stabilize the austenite phase for optimum TRIP interactions. For steels containing between 3 and 8 weight pct Mn, the quench and partitioning (Q&P) process has been proposed. [5,6] In this process, austenite is stabilized by carbon partitioning from martensite to austenite, the partitioning taking place between the M s and M f temperatures. For steels containing 5 to 12 pct Mn, intercritical annealing, following the cold rolling of the martensitic microstructure, is investigated as a means of stabilizing the austenite by carbon and Mn partitioning. [7][8][9][10][11][12] The retained austenite fraction and stability depend, therefore, on the intercritical annealing temperature and time.Solute partitioning during intercritical annealing in medium-Mn steels has been investigated recently. Most of the research work is concerned with experimental determination of austenite volume fraction and composition. [13][14][15][16] Mn partitioning during intercritical annealing has been studied by atom probe tomography [13,17] and experimental results have been compared with simulation predictions. Mn partitioning has also been studied by TEM [14,[18][19][20] indicating that partitioning of Mn from ferrite to the austenite is slow. Thorough thermodynamic analyses of solute partitioning during intercritical annealing have been performed [21,22] indicating the role of alloying elements. However, kinetic analysis of the partitioning process is limited to relatively few alloy systems, 3 pct Mn, [23] 5 pct Mn [24,25] , and 12.2 pct Mn. [17] These works considered a specific intercritical annealing temperature and examined the partition of alloying elements at specific stages of annealing. Furthermore, the evolution of compos...

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Microstructural evolution and mechanical properties of hot-rolled 11% manganese TRIP steel

Cited by 74 publications

References 23 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

Mechanical properties and austenite stability in hot-rolled 0.2C–1.6/3.2Al–6Mn–Fe TRIP steel

Kinetics of Solute Partitioning During Intercritical Annealing of a Medium-Mn Steel

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