State-of-the-Science of High Manganese TWIP Steels for Automotive Applications

Cooman, Bruno C. De; Chen, Lei; Kim, Han Soo; Estrin, Yuri; Kim, S K; Voswinckel, Holger

doi:10.1007/978-1-84882-454-6_10

Cited by 61 publications

(54 citation statements)

References 12 publications

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“…There have been many publications on dynamic strain aging and the PLC effect in TWIP steels. [15][16][17] The microstructure and mechanical properties of the hot rolled Fe-13Mn-0.2C-1Al-1Si TWIP Steel is investigated in this study. The conclusion of the study was expected to be an aid for future industrial manufacture of TWIP steel.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Portevin-Le Chatelier effect of hot-rolled Fe-13Mn-0.2C-1Al-1Si TWIP steel

Aydemir¹,

Zeytin²,

Guven³

2016

Mater. Tehnol.

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This study was undertaken to investigate the microstructure and mechanical properties of hot rolled Fe-13Mn-0.2C-1Al-1Si TWIP steel. Tensile tests were carried out at different strain rates to determine the Portevin-Le Chatelier (PLC) effect during deformation. Subsequently, the samples were investigated by light microscopy and SEM. The sample microstructures revealed inhomogeneous dislocation zones, deformation twinning and twin-dislocation interactions. Consequently, the PLC effect during deformation was determined to be responsible for the excellent mechanical properties of the TWIP steel. Keywords: TWIP steel, mechanical properties, microstructure, Portevin Le Chatelier effect V {tudiji je bila preiskovana mikrostruktura in mehanske lastnosti vro~e valjanega Fe-13Mn-0.2C-1Al-1Si TWIP jekla. Natezni preizkusi so bili izvedeni pri razli~nih hitrostih obremenjevanja. Kot rezultat nateznega preizkusa je bil ugotovljen u~inek Portevin-Le Chatelier (PLC) med deformacijo. Vzorci so bili nato preiskani s svetlobnim mikroskopom in s SEM. Mikrostruktura vzorcev ka`e nehomogena podro~ja dislokacij, deformacijske dvoj~ke in interakcije dvoj~kov z dislokacijami. Ugotovljeno je, da so odli~ne mehanske lastnosti TWIP jekla posledica vpliva PLC med deformacijo.

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Section: Introductionmentioning

confidence: 99%

Investigation of Portevin-Le Chatelier effect of hot-rolled Fe-13Mn-0.2C-1Al-1Si TWIP steel

Aydemir¹,

Zeytin²,

Guven³

2016

Mater. Tehnol.

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“…However, AHSS are not intrinsically lighter than other steels, but they are strong enough that thinner gages can be used to reduce vehicle weight [3]. Recent trends in automotive industry towards improved passenger safety and reduced weight have led to a great interest in AHSS, and TWIP steels are particularly promising due to their superior toughness and ductility [4]. However, it is also important to state that the TWIP steel is not a competitor to the AHSS, including UFG microalloyed HSLA, DP, BH, TRIP, multiphase steels, etc., not only because of the specific mechanical behavior during loading, but also because of the processing costs, particularly because TWIP steels are still in experimental stage.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti and B microadditions on the hot ductility behavior of a High-Mn austenitic Fe–23Mn–1.5Al–1.3Si–0.5C TWIP steel

Mejı́a

Salas-Reyes

Calvo

et al. 2015

Materials Science and Engineering: A

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a b s t r a c tThis research work studies the effect of combined Ti and B microadditions and the solidification route on the hot ductility behavior of a high-Mn austenitic Twinning Induced Plasticity (TWIP) steel. For this purpose, uniaxial hot tensile tests were carried out at different temperatures between 700 and 1100°C under a constant strain rate of 10. The hot ductility was determined by measuring the reduction of transverse area (%RA) after specimen rupture. Characterization was performed by SEM-EBSD and TEM techniques in order to identify the relationship between microstructural features and cracking phenomena. Results indicate that the early occurrence of dynamic recrystallization (DRX) at the intermediate temperature range (800-900°C) is the favorable mechanism that enhances the ductility, achieving RA values up to 82%. These high RA values are discussed in terms of the boron effect on the improvement of the grain-boundaries cohesion through non-equilibrium segregation, and Ti(C,N) precipitation, which reduces the formation of harmful precipitates such as BN and AlN. Additionally, the Fe 23 (B,C) 6 and B 4 C compounds were identified, which are less detrimental to hot ductility than boron-nitride compounds. Finally, the fracture surfaces of the present TWIP steels in the temperature range of the highest ductility indicate that the failure mode is of the ductile type as evidenced by the presence of many dimples.

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“…Development of new materials and improvement of those currently used in at last 10 years lead to obtaining new generation high-manganese steels such as TRIP, TWIP steels, as well as MBIP steel, with a unique combination of mechanical properties. Today, there are included the group of so-called Ultra High Strength Steels -UHSS [1][2][3]. Integration of high strength properties and a good formability, ensuring high absorption of energy by structural components, enables application of these new high-manganese steels in construction of means of transport, particularly in elements critical for the safety, and replacement of older generations of DP steels.…”

Section: Introductionmentioning

confidence: 99%

“…Silicon hardens the austenite solid solution, increases tensile strength and crack resistance. Mn-Al steels with SFE value between 20 mJ/m 2 and 60 mJ/m 2 are classified as the so-called TWIP steels with formation of mechanical twins in the austenitic matrix as a privileged mechanism of deformation [1,2,[8][9][10][11][12][13]. Their microstructure is characterized by the presence of mechanical twins as well as dislocation cells in the austenitic deformed matrix, but with a predominance of the presence of twins.…”

Section: Introductionmentioning

confidence: 99%

The Effect Of Strain Rate On The Mechanical Properties And Microstructure Of The High-Mn Steel After Dynamic Deformation Tests

Jabłońska¹,

Śmiglewicz²,

Niewielski³

2015

Archives of Metallurgy and Materials

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The paper presents results of dynamic tensile investigations of high-manganese Fe -20 wt.% Mn -3 wt.% Al -3 wt.% Si -0.2 wt.% steel. The research was carried out on a flywheel machine, which enables to perform dynamic tensile tests and impact bending with a linear velocity of the enforcing element in the range of 5÷40 m/s. It was found that the studied steel was characterized by very good mechanical properties. Strength of the tested materials was determined in the static tensile test and dynamic deformation test, while its hardness was measured with the Vickers hardness test method. The surface of fractures that were created in the areas where the sample was torn were analyzed. These fractures indicate the presence of transcrystalline ductile fractures. Fractographic tests were performed with the use of a scanning electron microscope. The structure was analyzed by light optical microscopy. Substructure studies revealed occurrence of mechanical twinning induced by high strain rates. A detailed analysis of the structure was performed with the use of a transmission scanning electron microscope STEM.Keywords: high-manganese steel, dynamic deformation test, strain rate, impact strength, mechanical twinning, structure W pracy przedstawiono wyniki wstępnych badań dynamicznego rozciągania wysokomanganowej stali gatunku X20MnAlSi16-3-3. Badania przeprowadzono na młocie rotacyjnym, który posiada możliwość realizacji prób dynamicznego rozciągania i udarowego zginania w zakresie prędkości liniowej elementu wymuszającego od 5÷40 m/s. Badana stal charakteryzuje się bardzo dobrymi właściwościami mechanicznymi. Wyniki badań uzyskano na podstawie statycznej próby rozciągania, próby dynamicznego rozciągania na młocie rotacyjnym oraz pomiaru twardości metodą Vickersa. Przeanalizowano powierzchnie przełomów powstałych w miejscu zerwania podczas prób rozciągania, które wskazują na obecność przełomów transkrystalicznych ciągliwych. Badania strukturalne wykonano z wykorzystaniem techniki mikroskopii świetlnej, skaningowej mikroskopii elektronowej i skaningowej transmisyjnej mikroskopii elektronowej. Przeprowadzone badania substruktury ujawniły obecność mechanizmu bliźniakowania mechanicznego, indukowanego w warunkach dużych prędkości odkształcenia.

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State-of-the-Science of High Manganese TWIP Steels for Automotive Applications

Cited by 61 publications

References 12 publications

Investigation of Portevin-Le Chatelier effect of hot-rolled Fe-13Mn-0.2C-1Al-1Si TWIP steel

Investigation of Portevin-Le Chatelier effect of hot-rolled Fe-13Mn-0.2C-1Al-1Si TWIP steel

Effect of Ti and B microadditions on the hot ductility behavior of a High-Mn austenitic Fe–23Mn–1.5Al–1.3Si–0.5C TWIP steel

The Effect Of Strain Rate On The Mechanical Properties And Microstructure Of The High-Mn Steel After Dynamic Deformation Tests

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