Exceptionally high strength and good ductility in an ultrafine-grained 316L steel processed by severe plastic deformation and subsequent annealing

El-Tahawy, Moustafa; Pereira, Pedro Henrique R.; Huang, Yi; Park, Hyeji; Choe, Heeman; Langdon, Terence G.; Gubicza, Jenő

doi:10.1016/j.matlet.2017.12.040

Cited by 34 publications

(14 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is also noted that a very high saturation dislocation density also formed in a traditional 316L steel sample ((143 « 10) © 10 14 m ¹2 ) where the SFE is similarly low (³19 mJ/m 2 ) as for CoCrFeMnNi HEA. 50) Beside the properties of materials (e.g., melting point, SFE and solute content), the method of SPD may also influence the dislocation density. As an example, Fig.…”

Section: Dislocationsmentioning

confidence: 99%

Lattice Defects and Their Influence on the Mechanical Properties of Bulk Materials Processed by Severe Plastic Deformation

Gubicza

2019

Mater. Trans.

Self Cite

View full text Add to dashboard Cite

Processing of metallic materials by Severe Plastic Deformation (SPD) leads to the formation of many lattice defects (e.g., vacancies, dislocations, twin faults and grain boundaries). In this paper, the characteristic features of the defect structure in SPD-processed bulk metallic materials are overviewed. The influence of the material properties, such as the melting point, stacking fault energy and solute content, as well as the SPD-processing conditions (e.g., SPD route and applied hydrostatic pressure) on the type and densities of defects is discussed in detail. In addition, the effect of lattice defects on the mechanical strength of SPD-processed materials is oveviewed.

show abstract

Section: Dislocationsmentioning

confidence: 99%

Lattice Defects and Their Influence on the Mechanical Properties of Bulk Materials Processed by Severe Plastic Deformation

Gubicza

2019

Mater. Trans.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Since only a limited grain refinement can be attained through cold working, 316L SS is a suitable alloy to be strengthened by HPT processing. In fact, numerous studies have demonstrated favourable mechanical (hardness, strength, and ductility) and functional (thermal stability, corrosion, and tribological) properties of wrought and cast 316L SS after HPT processing [9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Influence of High-Pressure Torsion on the Microstructure and Microhardness of Additively Manufactured 316L Stainless Steel

Yusuf

Chen

Gao

2021

Metals

View full text Add to dashboard Cite

High-pressure torsion (HPT) is known as an effective severe plastic deformation (SPD) technique to produce bulk ultrafine-grained (UFG) metals and alloys by the application of combined compressive force and torsional shear strains on thin disk samples. In this study, the microstructures and microhardness evolution of an additively manufactured (AM) 316L stainless steel (316L SS) processed through 5 HPT revolutions are evaluated at the central disk area, where the effective shear strains are relatively low compared to the peripheral regions. Scanning electron microscopy (SEM) analysis showed that the cellular network sub-structures in AM 316L SS were destroyed after 5 HPT revolutions. Transmission electron microscopy (TEM) observations revealed non-equilibrium ultrafine grained (UFG) microstructures (average grain size: ~115 nm) after 5 revolutions. Furthermore, energy dispersive x-ray spectroscopy (EDX) analysis suggested that spherical Cr-based nano-silicates are also found in the as-received condition, which are retained even after HPT processing. Vickers microhardness (HV) measurements indicated significant increase in average hardness values from ~220 HV before HPT processing to ~560 HV after 5 revolutions. Quantitative X-ray diffraction (XRD) patterns exhibit a considerable increase in dislocation density from ~0.7 × 1013 m−2 to ~1.04 × 1015 m−2. The super-high average hardness increment after 5 HPT revolutions is predicted to be attributed to the UFG grain refinement, significant increase in dislocation densities and the presence of the Cr-based nano-silicates, according to the model established based on the linear additive theory.

show abstract

“…Thus produced nanostructured materials show excellent strength, often accompanied by reduced ductility compared to coarse‐grained materials . For example, in austenitic stainless steel deformed by high pressure torsion (HPT), which is one of the SPD techniques, the ultimate tensile strength reached 2250 MPa, but the elongation to failure was far below 5% . Therefore, annealing may be an effective method for controlling microstructure, for example, to improve ductility at little cost to strength and good corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Various heat treatment methods have been studied and proposed as effective methods for controlling the microstructure of different materials. Most articles focus on conventional heat treatment . This can be successful in improving the mechanical properties obtained in ultrafine‐grained steel deformed by HPT and subsequently annealed at 723 °C.…”

Section: Introductionmentioning

confidence: 99%

“…This can be successful in improving the mechanical properties obtained in ultrafine‐grained steel deformed by HPT and subsequently annealed at 723 °C. A remarkably good combination of yield strength (1330 MPa) and elongation to failure (43%) obtained in such a process has been attributed to the almost full reversion of martensite into austenite at a grain size of approximately 200 nm . However, it seems that, by applying unconventional annealing techniques, new possibilities arise of producing microstructures unachievable by conventional annealing.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phenomena Occurring in Nanostructured Stainless Steel 316LVM during Annealing under High Hydrostatic Pressure

et al. 2018

View full text Add to dashboard Cite

The aim of the study is to demonstrate the impact of high hydrostatic pressure annealing on the grain boundary character, precipitation rate, and susceptibility to intergranular corrosion of nanostructured austenitic stainless steel 316LVM. To this end, samples of an austenitic stainless steel are deformed by high pressure torsion and subsequently annealed at 900 C for 10 min under a pressure of 2, 6 GPa and, for comparison, under atmospheric pressure. The resulting microstructures are examined using electron beam scattering diffraction, and transmission and scanning electron microscopy. It is shown that the pressure applied during annealing leads to a higher percentage of high-angle grain boundaries than does atmospheric pressure. Moreover, it promotes the coexistence of two orientations, <111> and <100>, whereas atmospheric supports mainly <111>. High pressure hinders the growth of carbides, but drastically increases their number compared with atmospheric pressure annealing. As a consequence, the highest number of Cr 23 C 6 carbides are present in the sample annealed under 6 GPa, making this sample susceptible to intergranular corrosion.

show abstract

Exceptionally high strength and good ductility in an ultrafine-grained 316L steel processed by severe plastic deformation and subsequent annealing

Cited by 34 publications

References 12 publications

Lattice Defects and Their Influence on the Mechanical Properties of Bulk Materials Processed by Severe Plastic Deformation

Lattice Defects and Their Influence on the Mechanical Properties of Bulk Materials Processed by Severe Plastic Deformation

Influence of High-Pressure Torsion on the Microstructure and Microhardness of Additively Manufactured 316L Stainless Steel

Phenomena Occurring in Nanostructured Stainless Steel 316LVM during Annealing under High Hydrostatic Pressure

Contact Info

Product

Resources

About