Jiang, W., An, X., Ni, S., Wang, L., He, J., Chen, Z., Huang, Y. and Song, M., 2023. Achieving excellent strength-ductility combination through the control of intricate substructures in an additively manufactured Co–Cr–Mo alloy. Materials Science and Engineering: A, 886, 145687.
Full text available as:
|
PDF
Ni Song_MSE 2023 accepted manuscript.pdf - Accepted Version Available under License Creative Commons Attribution Non-commercial No Derivatives. 2MB | |
Copyright to original material in this document is with the original owner(s). Access to this content through BURO is granted on condition that you use it only for research, scholarly or other non-commercial purposes. If you wish to use it for any other purposes, you must contact BU via BURO@bournemouth.ac.uk. Any third party copyright material in this document remains the property of its respective owner(s). BU grants no licence for further use of that third party material. |
DOI: 10.1016/j.msea.2023.145687
Abstract
In this study, we successfully endowed a classical Co25Cr5Mo5W alloy with excellent strength-ductility combination by regulating the substructures during laser powder bed fusion (LPBF) and subsequent heat treatment. State-of-the-art characterizations reveal that the as-built Co25Cr5Mo5W alloy features integrated networks of dense cell boundaries and stacking faults within a near-pure face-centered cubic matrix, which jointly confer a high yield strength of ∼820 MPa and a high ductility of ∼22.3%. Upon heat treatment, the heavy decoration of solutes Cr, Mo, W, and Si at cell boundaries triggers heterogeneous nucleation and growth of Laves precipitates within 15 min. After that, global intercellular precipitation occurs, further boosting the yield strength to ∼1170 MPa at a decent ductility of ∼7.5% when heat-treated for 60 min. Such a finding establishes a clear connection between the substructures and the mechanical properties, offering valuable implications for surpassing the current mechanical limitation in the Co–Cr–Mo alloy family.
Item Type: | Article |
---|---|
ISSN: | 0921-5093 |
Uncontrolled Keywords: | Additive manufacturing; Cobalt-chromium-molybdenum alloy; Stacking fault; Precipitation behavior; Mechanical properties |
Group: | Faculty of Science & Technology |
ID Code: | 38986 |
Deposited By: | Symplectic RT2 |
Deposited On: | 19 Sep 2023 13:46 |
Last Modified: | 13 Sep 2024 01:08 |
Downloads
Downloads per month over past year
Repository Staff Only - |