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Microstructure and corrosion performance of 316L stainless steel fabricated by selective laser, melting and processed through high-pressure torsion

Microstructure and corrosion performance of 316L stainless steel fabricated by selective laser, melting and processed through high-pressure torsion
Microstructure and corrosion performance of 316L stainless steel fabricated by selective laser, melting and processed through high-pressure torsion
For the first time, the novel combination of severe plastic deformation (SPD) and Additive Manufacturing (AM) in a single process sequence was explored. 316L stainless steel (316L SS) alloy was firstly fabricated by Selective Laser Melting (SLM) AM process and subsequently processed by high-pressure torsion (HPT) SPD technique under a constant pressure of 6 GPa for different torsional revolutions. All the processed samples were subjected to electrochemical testing in a 3.5 wt % NaCl aqueous solution using open-circuit potential, potentiodynamic polarisation, and electrochemical impedance spectroscopy techniques, and characterised with scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The microscopic measurement results revealed that the melt pools and cellular structures obtained via SLM become increasingly refined through increased HPT revolutions, accompanied by significant porosity reduction and significant increase in microhardness. TEM observations revealed a homogeneously distributed nano-scale grains after 10 turns. Moreover, the results demonstrated that HPT processing significantly enhances corrosion performance of the 316L SS alloy in NaCl solution, due to the cellular structure refinement, homogeneous microstructure distribution, and the substantial removal of pores and defects. SEM and energy dispersive x-ray spectroscopy (EDX) analysis were also carried out on the corroded samples to determine the influence of cellular structure refinement on the corrosion characteristics of the 316L SS alloy.
Selective Laser Melting, High-pressure Torsion, 316L stainless steel, Microhardness, Corrosion behaviour
0925-8388
360-375
Mohd Yusuf, Shahir Yasin Bin
5888c057-33da-45f3-a84d-95a291db8f34
Nie, Mengyan
e1298ff3-26df-4c0b-b307-0ce7b8165c91
Chen, Ying
8658c64a-54df-4113-b8af-9bf850dbde46
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Mohd Yusuf, Shahir Yasin Bin
5888c057-33da-45f3-a84d-95a291db8f34
Nie, Mengyan
e1298ff3-26df-4c0b-b307-0ce7b8165c91
Chen, Ying
8658c64a-54df-4113-b8af-9bf850dbde46
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21

Mohd Yusuf, Shahir Yasin Bin, Nie, Mengyan, Chen, Ying, Yang, Shoufeng and Gao, Nong (2018) Microstructure and corrosion performance of 316L stainless steel fabricated by selective laser, melting and processed through high-pressure torsion. Journal of Alloys and Compounds, 763, 360-375. (doi:10.1016/j.jallcom.2018.05.284).

Record type: Article

Abstract

For the first time, the novel combination of severe plastic deformation (SPD) and Additive Manufacturing (AM) in a single process sequence was explored. 316L stainless steel (316L SS) alloy was firstly fabricated by Selective Laser Melting (SLM) AM process and subsequently processed by high-pressure torsion (HPT) SPD technique under a constant pressure of 6 GPa for different torsional revolutions. All the processed samples were subjected to electrochemical testing in a 3.5 wt % NaCl aqueous solution using open-circuit potential, potentiodynamic polarisation, and electrochemical impedance spectroscopy techniques, and characterised with scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The microscopic measurement results revealed that the melt pools and cellular structures obtained via SLM become increasingly refined through increased HPT revolutions, accompanied by significant porosity reduction and significant increase in microhardness. TEM observations revealed a homogeneously distributed nano-scale grains after 10 turns. Moreover, the results demonstrated that HPT processing significantly enhances corrosion performance of the 316L SS alloy in NaCl solution, due to the cellular structure refinement, homogeneous microstructure distribution, and the substantial removal of pores and defects. SEM and energy dispersive x-ray spectroscopy (EDX) analysis were also carried out on the corroded samples to determine the influence of cellular structure refinement on the corrosion characteristics of the 316L SS alloy.

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Accepted/In Press date: 23 May 2018
e-pub ahead of print date: 24 May 2018
Published date: 30 September 2018
Keywords: Selective Laser Melting, High-pressure Torsion, 316L stainless steel, Microhardness, Corrosion behaviour

Identifiers

Local EPrints ID: 421451
URI: http://eprints.soton.ac.uk/id/eprint/421451
ISSN: 0925-8388
PURE UUID: 44e65a1e-c7da-43f5-99ce-288c3e69bdf0
ORCID for Shoufeng Yang: ORCID iD orcid.org/0000-0002-3888-3211

Catalogue record

Date deposited: 12 Jun 2018 16:30
Last modified: 26 Nov 2021 05:10

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Contributors

Author: Mengyan Nie
Author: Ying Chen
Author: Shoufeng Yang ORCID iD
Author: Nong Gao

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