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Effect of high-pressure torsion on the microstructural evolution and mechanical properties of an Fe-10Ni-7Mn (wt. %) lath martensitic steel

Effect of high-pressure torsion on the microstructural evolution and mechanical properties of an Fe-10Ni-7Mn (wt. %) lath martensitic steel
Effect of high-pressure torsion on the microstructural evolution and mechanical properties of an Fe-10Ni-7Mn (wt. %) lath martensitic steel
The high-pressure torsion (HPT) process is a severe plastic deformation (SPD) technique which imposes exceptionally high strains to produce extremely small grain sizes in bulk materials. In this paper, the HPT process was carried out on an Fe-10Ni-7Mn (wt.%) martensitic steel up to 20 revolutions at a rotation speed of 1 rpm under a pressure of 6.0 GPa at room temperature. The effects of the HPT process on the microstructure evolution and mechanical properties of the alloy were investigated by X-ray diffraction (XRD) analysis, electron backscatter diffraction (EBSD), micro-hardness measurement and conventional tensile testing. The XRD analysis revealed no changes in the detected phases after deformation. A significant refinement in grain size from 200 m in the initial microstructure to around 230 nm after HPT was observed by EBSD. Although based on a rigid body assumption the imposed strain is linearly proportional to the distance from the center in HPT-processed disks, after 20 revolutions a uniform micro-hardness increment up to ~650 Hv was achieved. Moreover, the tensile strength of the alloy increased from ~800 MPa in the solution annealed condition to about 2300 MPa after the HPT process with a total tensile strain of 4%. Experimental results indicated that the HPT process leads to improvement of the tensile strength with a reasonable ductility due to the significant refinement of the microstructure.
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1-7
Javadzadeh, Faezeh
cec8bdf2-1763-4be9-be94-fd0b4e9316ca
Koohdar, Hamidreza
6d616b2b-5bc8-4fe7-8f60-f57dcacedd72
Jafarian, Hamidreza
2d3dd302-34fa-4066-9ed2-31daecc0c170
Nili-Ahmadabadi, Mahmoud
74c5b0be-a73e-40fe-bc6e-8450bc0eeaf7
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Heydarzadeh Sohi, Mahmoud
Zamani, Cyrus
Javadzadeh, Faezeh
cec8bdf2-1763-4be9-be94-fd0b4e9316ca
Koohdar, Hamidreza
6d616b2b-5bc8-4fe7-8f60-f57dcacedd72
Jafarian, Hamidreza
2d3dd302-34fa-4066-9ed2-31daecc0c170
Nili-Ahmadabadi, Mahmoud
74c5b0be-a73e-40fe-bc6e-8450bc0eeaf7
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Heydarzadeh Sohi, Mahmoud
Zamani, Cyrus

Javadzadeh, Faezeh, Koohdar, Hamidreza, Jafarian, Hamidreza, Nili-Ahmadabadi, Mahmoud, Huang, Yi and Langdon, Terence G. (2018) Effect of high-pressure torsion on the microstructural evolution and mechanical properties of an Fe-10Ni-7Mn (wt. %) lath martensitic steel. Heydarzadeh Sohi, Mahmoud and Zamani, Cyrus (eds.) In 6th International Biennial Conference on Ultrafine Grained and Nanostructured Materials. vol. 1920, 0 pp, pp. 1-7. (doi:10.1063/1.5018982).

Record type: Conference or Workshop Item (Paper)

Abstract

The high-pressure torsion (HPT) process is a severe plastic deformation (SPD) technique which imposes exceptionally high strains to produce extremely small grain sizes in bulk materials. In this paper, the HPT process was carried out on an Fe-10Ni-7Mn (wt.%) martensitic steel up to 20 revolutions at a rotation speed of 1 rpm under a pressure of 6.0 GPa at room temperature. The effects of the HPT process on the microstructure evolution and mechanical properties of the alloy were investigated by X-ray diffraction (XRD) analysis, electron backscatter diffraction (EBSD), micro-hardness measurement and conventional tensile testing. The XRD analysis revealed no changes in the detected phases after deformation. A significant refinement in grain size from 200 m in the initial microstructure to around 230 nm after HPT was observed by EBSD. Although based on a rigid body assumption the imposed strain is linearly proportional to the distance from the center in HPT-processed disks, after 20 revolutions a uniform micro-hardness increment up to ~650 Hv was achieved. Moreover, the tensile strength of the alloy increased from ~800 MPa in the solution annealed condition to about 2300 MPa after the HPT process with a total tensile strain of 4%. Experimental results indicated that the HPT process leads to improvement of the tensile strength with a reasonable ductility due to the significant refinement of the microstructure.

Text Javadzadeh_UFG article (Fe-10Ni-7Mn, HPT) - Accepted Manuscript
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More information

Accepted/In Press date: 15 August 2017
e-pub ahead of print date: 10 January 2018
Published date: 10 January 2018
Venue - Dates: International Biennial Conference on Ultrafine Grained and Nano-structured Materials (UFGNSM 2017), Kish Island, Iran, Islamic Republic of, 2017-11-12 - 2017-11-13

Identifiers

Local EPrints ID: 413201
URI: https://eprints.soton.ac.uk/id/eprint/413201
PURE UUID: e9e015f8-910e-4200-8d09-cfb387db7ccb
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 17 Aug 2017 16:30
Last modified: 06 Jun 2018 12:48

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Contributors

Author: Faezeh Javadzadeh
Author: Hamidreza Koohdar
Author: Hamidreza Jafarian
Author: Mahmoud Nili-Ahmadabadi
Author: Yi Huang ORCID iD
Editor: Mahmoud Heydarzadeh Sohi
Editor: Cyrus Zamani

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