Effects of recrystallization annealing temperature on carbide precipitation, microstructure, and mechanical properties in Fe–18Mn–0.6C–1.5Al TWIP steel

Kang, Singon; Jung, Yeon Soo; Jun, Jae-Hoon; Lee, Young Kook

doi:10.1016/j.msea.2009.08.048

Cited by 198 publications

(64 citation statements)

References 23 publications

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“…As a summary of the mechanical properties measured so far for high specific strength steels, Fig. 4c and d compare the tensile properties of our HSSS with that of Kim et al [27], as well as with the conventional FeeMneAleC based austenitic [5,11,24], duplex [20,25] and triplex [17,23,26] steels. As can be seen, the HSSS in the present study shows an outstanding combination of the specific yield strength (SYS) and uniform elongation, while exhibiting an acceptable combination of the yield strength-to-ultimate tensile strength (YS-to-UTS) ratio and the uniform elongation.…”

Section: Microstructural Characterizationmentioning

confidence: 89%

“…High-strength and high-ductility steels are needed in various industrial sectors such as automobiles, aviation, aerospace, power, transport, and building construction. Such steels have been developed based on several design principles; typical categories include the transformation-induced plasticity (TRIP) steels [8,9], twinning-induced plasticity (TWIP) steels [10,11], dual-phase (DP) steels [12,13], nano-structured steels [14,15], and even hypereutectoid steel wires with ultrahigh (6.35 GPa) tensile strength [16].…”

Section: Introductionmentioning

confidence: 99%

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Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

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Keywords:High specific strength steel Dual-phase nanostructure Strain hardening Ductility In situ high-energy X-ray diffraction a b s t r a c tWe report a detailed study of the strain hardening behavior of a Fee16Mne10Ale0.86Ce5Ni (weight percent) high specific strength (i.e. yield strength-to-mass density ratio) steel (HSSS) during uniaxial tensile deformation. The dual-phase (g-austenite and B2 intermetallic compound) HSSS possesses high yield strength of 1.2e1.4 GPa and uniform elongation of 18e34%. The tensile deformation of the HSSS exhibits an initial yield-peak, followed by a transient characterized by an up-turn of the strain hardening rate. Using synchrotron based high-energy in situ X-ray diffraction, the evolution of lattice strains in both the g and B2 phases was monitored, which has disclosed an explicit elasto-plastic transition through load transfer and strain partitioning between the two phases followed by co-deformation. The unloadingreloading tests revealed the Bauschinger effect: during unloading yield in g occurs even when the applied load is still in tension. The extraordinary strain hardening rate can be attributed to the high back stresses that arise from the strain incompatibility caused by the microstructural heterogeneity in the HSSS.

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Section: Microstructural Characterizationmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

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“…To establish the role of dislocations, samples pre-strained to 30 per cent elongation were annealed to induce recovery without changing the austenite grain size, at 550 • C for 10 min [25], and then subjected to hydrogen charging. It is clear that the amount of reversibly trapped diffusible hydrogen is reduced, thus demonstrating the role of dislocations as trapping sites.…”

Section: (C) Trapping Of Hydrogenmentioning

confidence: 99%

Effect of aluminium on hydrogen-induced fracture behaviour in austenitic Fe–Mn–C steel

et al. 2013

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It is known empirically that the addition of aluminium as a solute in high-Mn austenitic steels dramatically improves their resistance to hydrogen-induced embrittlement. A variety of experimental techniques, including the characterization of trapping sites and high-resolution observation of fracture facets, have been used to reveal the mechanism by which aluminium induces this effect. It is found that transgranular fracture is promoted by the segregation of hydrogen to mechanical twin interfaces and to any -martensite that is induced during deformation. Because aluminium increases the stacking fault energy of austenite, the tendency for mechanical twinning is reduced, and the formation of deformationinduced martensite eliminated. These two effects contribute to the resistance of the aluminium-alloyed steel to hydrogen embrittlement.

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“…Similarly, Santos et al [15] and Kang et al [16] have investigated the 55 effect of annealing temperature on recrystallisation in TWIP steels, concluding 56 that specimens exhibiting a finer grain size also display higher yield strengths.…”

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confidence: 99%

The effect of grain size on the twin initiation stress in a TWIP steel

2015

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The influence of grain size on the twinning stress of an Fe-15Mn-2Al-2Si-0.7C twinning induced plasticity (TWIP) steel has been investigated. Five grain sizes were obtained using a combination of cold rolling and annealing. Electron backscatter diffraction (EBSD) analysis revealed that the material exhibited a typical cold rolled and annealed texture. Tensile testing showed the yield stress to increase with decreasing grain size, however, the ductility of the material was not substantially affected by a reduction in grain size. Cyclic tensile testing at sub-yield stresses indicated the accumulation of plastic strain with each cycle, consequently the nucleation stress for twinning was determined. The twin stress was found to increase with decreasing grain size. Furthermore, the amount of strain accumulated was greater in the coarser grain material. It is believed that this is due to a difference in the twin thickness, which is influenced by the initial grain size of the material. SEM and TEM analysis of the material deformed to 5 % strain revealed thinner primary twins in the fine grain material compared to the coarse grain. TEM examination also showed the dislocation arrangement is affected by the grain size. Furthermore, a larger fraction of stacking faults was observed in the coarse-grained material. It is concluded that the twin nucleation stress and also the thickness of the deformation twins in a TWIP steel, is influenced by the initial grain size of the material. In addition grain refinement results in a boost in strength and energy absorption capabilities in the material.

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Effects of recrystallization annealing temperature on carbide precipitation, microstructure, and mechanical properties in Fe–18Mn–0.6C–1.5Al TWIP steel

Cited by 198 publications

References 23 publications

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

Effect of aluminium on hydrogen-induced fracture behaviour in austenitic Fe–Mn–C steel

The effect of grain size on the twin initiation stress in a TWIP steel

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