Structural strengthening of an austenitic stainless steel subjected to warm-to-hot working

Yanushkevich, Zhanna; Mogucheva, Anna; Tikhonova, Marina; Belyakov, Andrey; Kaibyshev, Rustam

doi:10.1016/j.matchar.2011.02.005

Cited by 67 publications

(58 citation statements)

References 13 publications

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“…(1). However, the K ¼0.11 MPa m 0.5 is equal to the value obtained for an austenitic steel containing a high dislocation density when a similar separation of the contributions of boundary strengthening and dislocation strengthening has been made [10]. Thereby, the YS can be expressed as…”

Section: Quantitative Analysis Of the Strain Hardeningmentioning

confidence: 67%

“…It is worth noting that the estimation of the effect of grain size on YS in austenitic steel with a dislocation density higher than ρ$10 14 m À 2 without considering the contribution of the deformation strengthening overestimates the K H value [10,37]. An analysis of the deformation strengthening mechanism in addition to grain boundary strengthening can be achieved using the modified Hall-Petch equation [10,14]:…”

Section: Quantitative Analysis Of the Strain Hardeningmentioning

confidence: 99%

“…An analysis of the deformation strengthening mechanism in addition to grain boundary strengthening can be achieved using the modified Hall-Petch equation [10,14]:…”

Section: Quantitative Analysis Of the Strain Hardeningmentioning

confidence: 99%

“…It is known that in face-centered cubic (fcc) metals with low stacking fault energies (SFEs),extensive deformation twinning results in the formation of deformation twins with a plate-like shape as well as nanometer spacing and thickness [2,[7][8][9]. The twin boundaries, which are special (low ÀΣ coincidence site lattice) high-angle boundaries [7] and contain a high density of sessile dislocations [8], act as equally effective obstacles to dislocation gliding as conventional grain boundaries in polycrystalline austenitic steels [10]. The subdivision of initial grains into lamellas with thicknesses ranging from 10 to 40 nm [2][3][4][5][6]8] leads to a significant decrease in the effective grain size and, therefore, results in remarkable strengthening in accordance with the Hall-Petch relationship [11-13]: σ 0:2 ¼ σ 0 þK H d À 0:5 ð1Þ where σ 0.2 is the offset yield strength; d is the effective grain size, which is the distance between barriers to dislocation glide and can be estimated to be twice the width of lamellae [14]; σ 0 is the friction stress; and K H is the Hall-Petch coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Kusakin

Belyakov

Haase

et al. 2014

Materials Science and Engineering: A

118

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a b s t r a c tThe effect of cold rolling on the microstructure evolution and mechanical properties of Fe-23Mn-0.3C-1.5Al twinning-induced plasticity (TWIP) steel was studied. The extensive mechanical twinning subdivides the initial grains into nanoscale twin lamellas. In addition, the formation of deformation micro bands at ε440% induces the formation of nanostructured bands of localized shear. It is demonstrated that the mechanical twinning is notably important for dislocation storage within the matrix, as the twin boundaries act as equally effective obstacles to dislocation glide as conventional high-angle grain boundaries. However, the contribution of the grain size strengthening to the overall yield stress (YS) is much smaller than that of the deformation strengthening, which plays a major role in the superior work-hardening behavior of TWIP steels. A very high dislocation density of $ 2 Â 10 15 m À 2 is achieved after plastic deformation with moderate strains. The superposition of deformation strengthening and grain boundary strengthening leads to an increase in the YS from 235 MPa in the initial state to 1400 MPa after 80% rolling.

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Section: Quantitative Analysis Of the Strain Hardeningmentioning

confidence: 67%

Section: Quantitative Analysis Of the Strain Hardeningmentioning

confidence: 99%

“…An analysis of the deformation strengthening mechanism in addition to grain boundary strengthening can be achieved using the modified Hall-Petch equation [10,14]:…”

Section: Quantitative Analysis Of the Strain Hardeningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Kusakin

Belyakov

Haase

et al. 2014

Materials Science and Engineering: A

118

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“…Biaxial forging was selected as an advanced technique for processing of austenitic steels [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Influence of cold forging and annealing on microstructure and mechanical properties of a high-Mn TWIP steel

Kusakin¹,

Kalinenko²,

TSUZAKI³

et al. 2017

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The influence of cold biaxial forging and annealing on the microstructure evolution and mechanical properties of Fe-18Mn-0.6C-0.1N TWIP steel was investigated. The microstructure after thermomechanical treatment was examined by means of scanning electron microscopy (SEM) with electron back-scatter diffraction (EBSD) analyzer and transmission electron microscopy (TEM). The microstructure containing a high density of deformation twins was evolved by cold forging. Then, the deformation microstructure was recovered or partially recrystallized during subsequent annealing for 1 h at 673 or 873 K, respectively. The cold biaxial forging followed by partial recrystallization resulted in a very attractive combination of mechanical properties. The yield strength and the ultimate tensile strength of the steel after cold biaxial forging were 1320 and 1540 MPa, respectively, with elongation of 6 %. On the other hand, the yield and ultimate tensile strengths of 770 and 1110 MPa, respectively, and elongation about 40 % were obtained after partial recrystallization. The as-forged and recovery annealed samples showed fatigue limit of 600 and 550 MPa, respectively, and the sample after partial recrystallization showed slightly lower fatigue limit of 500 MPa.K e y w o r d s : TWIP-steel, deformation twinning, microstructure, mechanical properties, fatigue

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Effect of Severe Cold or Warm Deformation on Microstructure Evolution and Tensile Behavior of a 316L Stainless Steel

2015

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The deformation microstructures and mechanical properties of a 316L austenitic stainless steel subjected to large strain cold or warm plate rolling are studied. The cold or warm rolling was carried out at room temperature or 573 K, respectively, to different total true strains up to 3. The structural changes are characterized by the development of nanocrystalline structures with the transverse grain size of about 80 or 160 nm at room temperature or 573 K, respectively. The evolution of nanocrystalline structure under cold working conditions (room temperature) is assisted by the development of mechanical twinning and partial martensitic transformation that result in rapid grain refinement. The development of nanocrystalline structures during cold/warm working is accompanied by significant strengthening. The yield strength approaches 1 680 or 1 070 MPa after cold or warm rolling to a total strain of 3, respectively.

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Structural strengthening of an austenitic stainless steel subjected to warm-to-hot working

Cited by 67 publications

References 13 publications

Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Influence of cold forging and annealing on microstructure and mechanical properties of a high-Mn TWIP steel

Effect of Severe Cold or Warm Deformation on Microstructure Evolution and Tensile Behavior of a 316L Stainless Steel

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