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Effect of chromium and molybdenum increment on the crystal structure, nanoindentation and corrosion properties of cobalt based alloys

Effect of chromium and molybdenum increment on the crystal structure, nanoindentation and corrosion properties of cobalt based alloys
Effect of chromium and molybdenum increment on the crystal structure, nanoindentation and corrosion properties of cobalt based alloys
This study investigated the influence of chromium and molybdenum content (Cr: 20 – 35 wt.%, Mo: 5 and 10 wt.%) in a cobalt chromium molybdenum alloy system on the phases present in the microstructure, the nanomechanical and electrochemical behavior of the alloys. A linear increase in the hardness was found in relation to the increasing chromium content for both 5 and 10 wt.% Mo contents, whereas reduced modulus demonstrated an inflection at 30 wt.% Cr, which was influenced by the molybdenum content. The open circuit potential, polarization resistivity and linear sweep voltammetry disclosed that passivity of Co-Cr-Mo alloys improved in line with increasing Cr until 30 wt.%, with any further increase causing a depreciation in the corrosion properties. X-ray diffraction and optical metallographic analysis confirmed that as the chromium content transitioned through the 25-30 wt.% range, the sigma (σ) phase began to develop within the combined matrix of hexagonal close pack martensite (ε) and face centered cubic austenite (γ) phase.
X-Ray diffraction, cobalt–chromium–molybdenum alloys, corrosion, linear sweep voltammetry (LSV), nanoindentation, sigma phase (σ)
1862-6300
Ali Lone, Shaukat
9a9d3afd-a502-46d3-a94d-748431ed74bf
Xu, Dichu
e91ddedf-af9a-4f0c-834b-3e538c2e166b
Cook, Richard
06f8322d-81be-4f82-9326-19e55541c78f
Walter Hassel, Achim
7675df4a-8c90-419c-9a22-28ff83beaad8
Ali Lone, Shaukat
9a9d3afd-a502-46d3-a94d-748431ed74bf
Xu, Dichu
e91ddedf-af9a-4f0c-834b-3e538c2e166b
Cook, Richard
06f8322d-81be-4f82-9326-19e55541c78f
Walter Hassel, Achim
7675df4a-8c90-419c-9a22-28ff83beaad8

Ali Lone, Shaukat, Xu, Dichu, Cook, Richard and Walter Hassel, Achim (2022) Effect of chromium and molybdenum increment on the crystal structure, nanoindentation and corrosion properties of cobalt based alloys. Physica Status Solidi (A) Applications and Materials Science, 219 (23), [2200373]. (doi:10.1002/pssa.202200373).

Record type: Article

Abstract

This study investigated the influence of chromium and molybdenum content (Cr: 20 – 35 wt.%, Mo: 5 and 10 wt.%) in a cobalt chromium molybdenum alloy system on the phases present in the microstructure, the nanomechanical and electrochemical behavior of the alloys. A linear increase in the hardness was found in relation to the increasing chromium content for both 5 and 10 wt.% Mo contents, whereas reduced modulus demonstrated an inflection at 30 wt.% Cr, which was influenced by the molybdenum content. The open circuit potential, polarization resistivity and linear sweep voltammetry disclosed that passivity of Co-Cr-Mo alloys improved in line with increasing Cr until 30 wt.%, with any further increase causing a depreciation in the corrosion properties. X-ray diffraction and optical metallographic analysis confirmed that as the chromium content transitioned through the 25-30 wt.% range, the sigma (σ) phase began to develop within the combined matrix of hexagonal close pack martensite (ε) and face centered cubic austenite (γ) phase.

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Physica Status Solidi a - 2022 - Lone - Effect of Chromium and Molybdenum Increment on the Crystal Structure - Version of Record
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Accepted/In Press date: 20 September 2022
e-pub ahead of print date: 13 October 2022
Keywords: X-Ray diffraction, cobalt–chromium–molybdenum alloys, corrosion, linear sweep voltammetry (LSV), nanoindentation, sigma phase (σ)

Identifiers

Local EPrints ID: 470638
URI: http://eprints.soton.ac.uk/id/eprint/470638
ISSN: 1862-6300
PURE UUID: f7499b11-0aa6-472d-b139-bcd1e82be9a6
ORCID for Richard Cook: ORCID iD orcid.org/0000-0002-2468-5820

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Date deposited: 17 Oct 2022 16:37
Last modified: 07 Jan 2023 02:44

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Contributors

Author: Shaukat Ali Lone
Author: Dichu Xu
Author: Richard Cook ORCID iD
Author: Achim Walter Hassel

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