A novel ultrafine-grained Fe 22Mn 0.6C TWIP steel with superior strength and ductility

Tian, Yanzhong; Bai, Yu; Zhao, Lijia; Gao, Si; Yang, Haokun; Shibata, Akinobu; Zhang, Z.F.; Tsuji, Nobuhiro

doi:10.1016/j.matchar.2016.12.026

Cited by 91 publications

(37 citation statements)

References 39 publications

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“…Qihang PANG, 1,2) Mei XU, 3) Jing GUO, 1,2) * Huan QI, 1,2) Jiaji WANG 2) and Ling YAN 2) 1) School of Materials May 11, 2020) The deformation mechanism of Fe-20Mn-0.6C twinning-induced plasticity (TWIP) steel was studied with respect to different strain rates ranging from 10 − 4 to 10 3 s − 1 . Moreover, the microstructure of the ultra-high strength TWIP steel at each strain rate was characterized by transmission electron microscopy (TEM).…”

Section: Effects Of Strain Rate On the Deformation Mechanism Of Ultramentioning

confidence: 99%

“…Moreover, the high strength and negligible low-temperature brittle transformation of TWIP steel make it a promising choice for lightweight automotive applications. [1][2][3] Furthermore, the fabrication and forming process of TWIP steel have garnered much attention due to its excellent plasticity, optimal toughness, and widespread utilization in the automotive industry. [4][5][6] One should note that the typical strain rate of TWIP steel is in the range of 10 − 1 to 10 1 s − 1 .…”

Section: Introductionmentioning

confidence: 99%

“…........ (2). where'G Fe J H o , 'G Mn J H o , 'G C J Ho are the molar free energy changes of Fe, Mn, C between γ and ε phases, respectively.x Fe , x Mn and x C are atomic fractions of Fe, Mn, and C, respectively.…”

mentioning

confidence: 99%

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Effects of Strain Rate on the Deformation Mechanism of Ultra-high Strength TWIP Steel

Pang

Guo

et al. 2020

ISIJ Int.

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Section: Effects Of Strain Rate On the Deformation Mechanism Of Ultramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Strain Rate on the Deformation Mechanism of Ultra-high Strength TWIP Steel

Pang

Guo

et al. 2020

ISIJ Int.

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“…Figure 2(b,c) are, respectively, true stress-strain (σ true − ε true ) curves and strain hardening rate (ϑ = ∂σ/∂ε)-ε true curves. Interestingly, an upturn of ϑ appears during the early stage of small strains in sample after annealing at 923 K. The upturn of ϑ is widely observed in varying microstructures with varying deformation physics [14,19,22,23]. The trans-scale HS facilitates a largely extended elasto-plastic transition when HDI hardening already works.…”

mentioning

confidence: 96%

“…For example, ε u almost disappears at σ y of 1.45 GPa in 316L austenite stainless steel [12]. The high manganese steel of usually with Mn content larger than 10 wt% [13][14][15], along with recently well-developed medium-Mn (6-10 wt%) steels [1,16], features the TRIP effect for large ε u . However, the TRIP effect will be out of operation at high σ y .…”

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confidence: 96%

Superior strength-ductility synergy by hetero-structuring high manganese steel

Fang

Xue

Kobayashi

et al. 2020

Materials Research Letters

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Lacking of forest hardening makes low ductility in steels long challenge particularly at high yield strength. Here, we report to make good use of hetero-structuring for superior strength-ductility synergy in high manganese steel. The point is to retain original deformed structure of large quantity, along with recrystallized ultrafine-grains and fine grains, jointly for most effective heterogeneous deformation-induced (HDI) hardening especially at high strength. The residual plastic strain of larger than 0.2% and large proportion of HDI stress over 60% indicate the crucial role in ductility by HDI hardening. This renders a significantly upgraded strength-ductility combination within high strength scope. IMPACT STATEMENT By using the hetero-structuring strategy, a superior strength-ductility synergy is realized specifically at ultra-high strength in high manganese steel.

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Dynamic Transformation Mechanism for Producing Ultrafine Grained Steels

et al. 2018

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Ultrafine grained (UFG) steels with grain sizes around 1 micron exhibit an excellent strength‐ductility combination and have been extensively studied worldwide. Among the different grain refinement strategies, thermomechanical controlled processing (TMCP) employing dynamic transformation (DT), that is, ferrite transformation during deformation of austenite, is considered as the simplest and commercially exploitable approach to produce ultrafine ferrite (UFF) with grain size of a couple of microns or below. The present paper reviews the research history of DT and highlights the major aspects of continuous interest including the methods and evidences for identifying DT, thermodynamics and kinetics of DT, mechanism for UFF formation and the effects of some key thermomechanical parameters on DT (and UFF formation), together with an outlook for the future research, and new TMCP design for industrial application. This paper also discusses some areas remaining under debate such as the diffusional or displacive mechanism, thermodynamic modeling, and the mechanism for UFF formation, etc.

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A novel ultrafine-grained Fe 22Mn 0.6C TWIP steel with superior strength and ductility

Cited by 91 publications

References 39 publications

Effects of Strain Rate on the Deformation Mechanism of Ultra-high Strength TWIP Steel

Effects of Strain Rate on the Deformation Mechanism of Ultra-high Strength TWIP Steel

Superior strength-ductility synergy by hetero-structuring high manganese steel

Dynamic Transformation Mechanism for Producing Ultrafine Grained Steels

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