Effect of post-deformation annealing on the microstructure and mechanical behavior of an Fe–Ni–Mn steel processed by high-pressure torsion

Koohdar, Hamidreza; Nili‐Ahmadabadi, Mahmoud; Kalahroudi, Faezeh Javadzadeh; Jafarian, H.R.; Langdon, Terence G.

doi:10.1016/j.jmrt.2021.08.135

Cited by 4 publications

(1 citation statement)

References 48 publications

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“…Studies [9][10][11][12][13] have demonstrated improvements in the mechanical and operational properties, including fatigue strength, by obtaining an ultrafine-grained (UFG) structure in austenitic corrosion-resistant steels through equal channel angular pressing (ECAP) method. Another promising method that allows the ultrafine structure refinement without steel sample destruction is high-pressure torsion (HPT) [8,[14][15][16][17][18]. This method has already been tested on austenitic stainless steels, including 316L SS [19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanostructuring on Operational Properties of 316LVM Steel

Rybalchenko,

Anisimova,

Martynenko

et al. 2023

Metals

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In this study, high-pressure torsion (HPT) was used to process austenitic 316LVM stainless steel at 20 °C and 400 °C. The effects of HPT on the microstructure, mechanical, and functional properties of the steel were investigated. By applying both HPT modes on the 316LVM steel, a nanocrystalline state with an average size of the structural elements of ~46–50 nm was achieved. The density of the dislocations and twins present in the austenite phase varied depending on the specific HPT conditions. Despite achieving a similar structural state after HPT, the deformation temperatures used has different effects on the mechanical and functional properties of the steel. After HPT at 20 °C, the yield strength of the 316L steel increased by more than nine times up to 1890 MPa, and the fatigue limit by more than two times up to 550 MPa, when compared to its coarse-grained counter-parts. After HPT at 20 °C, the 316LVM steel exhibited better ductility, higher low-cycle fatigue resistance, greater resistance to corrosion, and improved in vitro biocompatibility compared to processing at 400 °C. The reasons for the deterioration of the properties after HPT at 400 °C are discussed in the article.

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Section: Introductionmentioning

confidence: 99%

Effect of Nanostructuring on Operational Properties of 316LVM Steel

Rybalchenko,

Anisimova,

Martynenko

et al. 2023

Metals

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Nanostructuring and Hardness Evolution in a Medium‐Mn Steel Processed by High‐Pressure Torsion Technique

Gubicza,

El‐Tahawy,

Huang

et al. 2024

Adv Eng Mater

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Severe plastic deformation (SPD) is performed on a newly developed medium Mn steel with the composition of Fe‐7.66Mn‐2Ni‐1Si‐0.23C‐0.05Nb (wt.%) to achieve a nanocrystalline microstructure. The SPD process utilizes the high‐pressure torsion (HPT) technique, resulting in a nominal shear strain of approximately 36,000% after processing the disk for 10 turns. X‐ray diffraction line profile analysis reveals an increase in dislocation density to around 230 × 1014 m‐2. In addition, under high strains, a face‐centered cubic (fcc) secondary phase emerges within the body‐centered cubic (bcc) matrix. Analytical transmission electron microscopy using energy dispersive X‐ray spectroscopy indicates that the secondary phase particles are enriched in Al, Mn, and Si. As the strain imposed during HPT increases, the simultaneous rise in dislocation density and nanostructuring lead to material hardening. However, the partial phase transformation from bcc to fcc contributes to material softening. As a result of these two opposite effects, the hardness exhibits a non‐monotonic variation with the shear strain, displaying, for 10 turns of HPT, a lower hardness compared to fewer turns, despite the continuous increase in dislocation density and decrease in crystallite size.This article is protected by copyright. All rights reserved.

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Microstructure and mechanical properties of ultrafine grained 5052 Al alloy fabricated by multi-pass differential speed rolling

Kang

2022

Journal of Materials Research and Technology

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Effect of post-deformation annealing on the microstructure and mechanical behavior of an Fe–Ni–Mn steel processed by high-pressure torsion

Cited by 4 publications

References 48 publications

Effect of Nanostructuring on Operational Properties of 316LVM Steel

Effect of Nanostructuring on Operational Properties of 316LVM Steel

Nanostructuring and Hardness Evolution in a Medium‐Mn Steel Processed by High‐Pressure Torsion Technique

Microstructure and mechanical properties of ultrafine grained 5052 Al alloy fabricated by multi-pass differential speed rolling

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