Deformation mechanisms of a modified 316L austenitic steel subjected to high pressure torsion

Scheriau, Stephan; Zhang, Zaoli; Kleber, Siegfried; Pippan, Reinhard

doi:10.1016/j.msea.2010.12.023

Cited by 103 publications

(68 citation statements)

References 49 publications

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“…Earlier, it was found that the HPT 316 steel processed at room and elevated temperatures demonstrates similar strength despite the difference in grain size and dislocation density [45,46]. In [34], it was shown that the steel, SPD processed at room temperature, exhibits no pronounced grain boundary segregations and fits well the Hall-Petch relation extrapolated to the corresponding grain size.…”

Section: Superstrength and Hardening Mechanismsmentioning

confidence: 79%

Recent Findings in Superior Strength and Ductility of Ultrafine-Grained Materials

Valiev

Zhu

2015

Trans. Mat. Res. Soc. Japan

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Over the last two decades it was well documented that the formation of ultrafine-grained (UFG) structures with the grain sizes in submicron (< 1 µm) or nanometer (< 100 nm) range in metallic materials increases strength but typically also leads to decrease in ductility. However, recent studies demonstrated that extraordinarily high strength and enhanced ductility can be obtained in the UFG metals and alloys when it is possible to control not only grain sizes but also the formation of various nanostructured elements, such as nanoparticles, nanotwins and grain boundary structures (states) by means of severe plastic deformation (SPD) techniques. These new trends applied to different metallic materials with superior strength and high ductility are considered and discussed in the present paper.

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Section: Superstrength and Hardening Mechanismsmentioning

confidence: 79%

Recent Findings in Superior Strength and Ductility of Ultrafine-Grained Materials

Valiev

Zhu

2015

Trans. Mat. Res. Soc. Japan

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“…Generally, the phase transformations were enhanced by increasing ε eq . 2,38) However, previous studies on pure Co 15,39) and steel 5) processed by HPT have reported the decrease in the volume fraction of ε phase through HPT processing, which could be attributed to a possible reverse transformation. 25) It has been reported that a reverse ε→γ transformation occurred in Co, when the grain diameter was below 100 nm.…”

Section: Mechanical Propertiesmentioning

confidence: 92%

“…[1][2][3][4] Among these techniques, HPT processing induces the highest strain, which achieves the smallest grain size, and is most preferable for laboratory applications. 1,3,[5][6][7][8] Previously, various metallic materials have been subjected to HPT processing such as titanium, aluminum, steel and magnesium. 5,[9][10][11][12][13] Recent studies have also reported that the microstructure of pure cobalt (Co) can be re ned to the nanoscale by HPT, thereby resulting in promising mechanical properties such as tensile strength and hardness.…”

Section: Introductionmentioning

confidence: 99%

“…1,3,[5][6][7][8] Previously, various metallic materials have been subjected to HPT processing such as titanium, aluminum, steel and magnesium. 5,[9][10][11][12][13] Recent studies have also reported that the microstructure of pure cobalt (Co) can be re ned to the nanoscale by HPT, thereby resulting in promising mechanical properties such as tensile strength and hardness. The ultimate tensile strength and hardness of nanocrystalline pure Co are 750 MPa and 3530 MPa, while those of the coarse-grained pure Co are 210 MPa and 1700 MPa, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Grain Refinement Mechanism and Evolution of Dislocation Structure of Co–Cr–Mo Alloy Subjected to High-Pressure Torsion

et al. 2016

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Ultra ne-grained materials often possess superior mechanical properties owing to their small grain size. The high-pressure torsion (HPT) process is a severe plastic deformation method used to induce ultra-large strain and produce ultra ne grains. In this study, the grain re nement mechanisms in the Co-28Cr-6Mo (CCM) alloy, evolution of dislocation density as a result of HPT and its effects on mechanical properties were investigated. The dislocation density and subgrain diameter were also calculated by X-ray line pro le analysis. The microstructure of the CCM alloy subjected to HPT processing (CCM HPT ) was evaluated as a function of torsional rotation number, N and equivalent strain, ε eq . Strain-induced γ→ε transformation in neighboring ultra ne grains is observed in CCM HPT processed at ε eq = 2.25 and ε eq = 4.5. Low-angle crystal rotation around the [110] fcc direction occurs in different locations in the same elongated grain neighboring ultra ne grains, which suggests the formation of low-angle grain boundaries in CCM HPT processed at ε eq = 2.25 and ε eq = 4.5. Two possible grain re nement mechanisms are proposed. The maximum dislocation densities, which are 2.8 × 10 16 m −2 in γ phase and 3.8 × 10 16 m −2 in ε phase, and maximum subgrain diameters, which are 21.2 nm in γ phase and 36 nm in ε phase, are achieved in CCM HPT processed at ε eq = 9. HPT processing causes a substantial increase in the tensile strength and hardness owing to the grain re nement and a signi cant increase in the volume fraction of ε phase and dislocation density.

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“…[6,[11][12][13] In FCC materials, it is known that SFE can affect the deformation mechanisms significantly. [14][15][16] When the SFE is high, dislocation slip in the wavy mode dominates the plastic deformation. [17] In contrast, when the SFE is low, dislocation slip in the planar mode dominates and dislocation recovery will be inhibited; besides, stacking faults (SFs) and deformation twins (DTs) prevail.…”

mentioning

confidence: 99%

Ductility Sensitivity to Stacking Fault Energy and Grain Size in Cu–Al Alloys

Tian

Shibata

Zhang

et al. 2016

Materials Research Letters

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Deformation mechanisms of a modified 316L austenitic steel subjected to high pressure torsion

Cited by 103 publications

References 49 publications

Recent Findings in Superior Strength and Ductility of Ultrafine-Grained Materials

Recent Findings in Superior Strength and Ductility of Ultrafine-Grained Materials

Grain Refinement Mechanism and Evolution of Dislocation Structure of Co–Cr–Mo Alloy Subjected to High-Pressure Torsion

Ductility Sensitivity to Stacking Fault Energy and Grain Size in Cu–Al Alloys

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