Critical Assessment 15: Science of deformation and failure mechanisms in twinning induced plasticity steels

Huang, Mingxin; Liang, Z.Y.; Luo, Zhi‐Chao

doi:10.1179/1743284715y.0000000095

Cited by 18 publications

(6 citation statements)

References 110 publications

(214 reference statements)

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“…94 Pierce et al 56 obtained the σ values by subtracting the DG g 1 and E str values from the SFE values measured using the TEM. The σ values range from 8.6 to 11.8 mJ m −2 for Fe- (22,25,28)Mn-3Al-3Si and Fe-18Mn-0.6C-(0,1.5)Al-(0,1.5)Si (wt-%) steels; the σ value decreases from 32.5 to 15.7 mJ m −2 with increasing Mn concentration in Fe- (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)Mn (wt-%) binary steels.…”

Section: Thermodynamics Calculationmentioning

confidence: 95%

“…Vitos et al 86 also collected the SFE values of Fe- (13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25) Cr- (13)(14)(15)(16))Ni (at.-%) steels measured using the TEM and the XRD from the literature, and compared them with the values calculated using ab initio simulation. They found that the addition of Cr to austenitic stainless steels lowers their SFE values.…”

Section: Alloying Elements Decreasing the Sfe (Cr And Si)mentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11] The strengthening mechanism of the fcc steels is strongly dependent upon the stacking fault energy (SFE) of γ austenite. 1,4,8,[10][11][12][13][14][15][16][17][18][19][20][21] It is known that whereas the mechanical stimulation of ε martensite is a dominant strengthening mechanism when the SFE value is less than approximately 20 mJ m −2 , TWIP begins to dominate as the SFE value ranges from 20 to 40 mJ m −2 . 1,2,8,9 For TWIP steels, the SFE influences a 'critical stress' for mechanical twinning, 13,[22][23][24][25][26] the twin fraction [27][28][29] and the twin thickness.…”

Section: Introductionmentioning

confidence: 99%

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Critical assessment 19: Stacking fault energies of austenitic steels

Lee¹,

Lee²,

Han³

2016

Materials Science and Technology

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The stacking fault energy (SFE) can play a key role in the deformation mechanism (e.g. transformation-induced plasticity and twinning-induced plasticity) of austenitic steels. Therefore, tremendous efforts have been devoted to exploring the evaluation methods and controlling parameters (e.g. alloying elements and temperature) that determine the SFE and its relationship to mechanical twinning. We provide here a summary of recent progress in studies of the SFE of austenite and of unsolved issues that may stimulate further investigation.

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Section: Thermodynamics Calculationmentioning

confidence: 95%

Section: Alloying Elements Decreasing the Sfe (Cr And Si)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Critical assessment 19: Stacking fault energies of austenitic steels

Lee¹,

Lee²,

Han³

2016

Materials Science and Technology

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“…The activation of multiple slip and the occurrence of dislocation pile-ups are considered prerequisites for twinning . In which, the prevalent dislocations and dislocation pile-ups are argued to be easily caused by the preference of planar slip favored in TWIP steels at room temperature with a relatively low stacking fault energy, which will promote the activation of deformation twinning (Ref 31,32,(46)(47)(48). In other words, a degraded activation of planar slip may lead to a weakened twinning.…”

Section: Characteristics Of Deformed Structuresmentioning

confidence: 99%

An Investigation on Microstructures and Mechanical Properties of Twinning-Induced Plasticity Steels Prepared by Directional Solidification

Wang

Huang

et al. 2021

J. of Materi Eng and Perform

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The mechanical behaviors and microstructural characteristics of three twinning-induced plasticity (TWIP) steels prepared using directional solidification at withdrawal rates of 3, 8, and 15 lms 21 (abbreviated as DS3, DS8, and DS15, respectively) were investigated. The results showed that all the samples solidified steadily in a cellular growth mode. The dendrite spacing decreased on increasing the withdrawal rate, but eliminated grains resulted from increased growth competition. At a low strain rate of 2.27310 23 s 21 , DS8 exhibited the best mechanical properties because of the adequately stimulated TWIP effect with welldeveloped twin structures and good deformation synergy between columnar grains being conducive to uniform stress distribution. Therefore, the work hardening ability significantly improved, with the highest working hardening exponent, n i , obtained at a high strain level. This was accompanied by a remarkably enhanced uniform plastic deformation ability. A weakened TWIP effect occurred due to suppressed twinning with fewer and nonuniform twins structures at a high strain rate of 3.79310 -1 s -1 . The high strain rate was evident to be not conducive to the activation of planar slip for directionally solidified samples, resulting in fewer and inhomogeneous slip systems. This effectively weakened twinning with relatively strong dislocation gliding instead. This remarkably decreased all the n i values in the medium-to-high strain range, leading to a significantly decreased plastic deformation ability and finally resulting in severely degraded plasticity, especially for DS8.

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“…As a third-generation advanced high strength steel (AHSS), quenching and partitioning (Q&P) steels exhibit an excellent combination of strength and ductility for automotive body lightweighting [1][2][3][4][5][6]. The production of ultimate tensile strength and total elongation has reached over 30,000 MPa % in state-of-the-art Q&P steels [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Improving Hydrogen Embrittlement Resistance of Hot-Stamped 1500 MPa Steel Parts That Have Undergone a Q&P Treatment by the Design of Retained Austenite and Martensite Matrix

Wang

Huang

2020

Metals

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Hydrogen embrittlement is one of the largest obstacles against the commercialisation of ultra-high strength quenching and partitioning (Q&P) steels with ultimate tensile strength over 1500 MPa, including the hot stamped steel parts that have undergone a Q&P treatment. In this work, the influence of partitioning temperature on hydrogen embrittlement of ultra-high strength Q&P steels is studied by pre-charged tensile tests with both dog-bone and notched samples. It is found that hydrogen embrittlement resistance is enhanced by the higher partitioning temperature. Then, the hydrogen embrittlement mechanism is analysed in terms of hydrogen, retained austenite, and martensite matrix. Thermal desorption analysis (TDA) shows that the hydrogen trapping properties are similar in the Q&P steels, which cannot explain the enhancement of hydrogen embrittlement resistance. On the contrary, it is found that the relatively low retained austenite stability after the higher temperature partitioning ensures more sufficient TRIP effect before hydrogen-induced fracture. Additionally, dislocation recovery and solute carbon depletion at the higher partitioning temperature can reduce the flow stress of the martensite matrix, improving its intrinsic toughness and reducing its hydrogen sensitivity, both of which result in the higher hydrogen embrittlement resistance.

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Critical Assessment 15: Science of deformation and failure mechanisms in twinning induced plasticity steels

Cited by 18 publications

References 110 publications

Critical assessment 19: Stacking fault energies of austenitic steels

Critical assessment 19: Stacking fault energies of austenitic steels

An Investigation on Microstructures and Mechanical Properties of Twinning-Induced Plasticity Steels Prepared by Directional Solidification

Improving Hydrogen Embrittlement Resistance of Hot-Stamped 1500 MPa Steel Parts That Have Undergone a Q&P Treatment by the Design of Retained Austenite and Martensite Matrix

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