Microstructures and mechanical properties of Nb nanoparticles modified Ni60 hard-facing alloy fabricated by laser metal deposition

Liu, L. and Wang, W. and Zhang, X. and Li, X. and Tian, Y. and Zhao, X. (2021) Microstructures and mechanical properties of Nb nanoparticles modified Ni60 hard-facing alloy fabricated by laser metal deposition. Materials Science and Engineering: A, 814: 141238. ISSN 0921-5093

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Abstract

Crack-free samples were made from Nb nanoparticles modified Ni60 hard-facing alloy using laser metal deposition. Addition of Nb nanoparticles was carried out to modify the columnar dendrites and eutectic microstructures by providing large number of nucleation sites. The purpose of this study was to evaluate the effect of nanoparticles addition on cracking susceptibility of Ni–Cr–B–Si alloy. The results show that with addition of Nb nanoparticles, the cracking susceptibility reduced significantly with acceptable hardness loss. Large hard phases were refined and the columnar dendrites were converted to equiaxed grains, leading to a separated eutectic microstructure which restrain the initiation and growth of cracks. The study demonstrated a new method to tackle the cracking problem of laser manufactured Ni–Cr–B–Si alloys, accelerating the adoption of Ni–Cr–B–Si alloys on additive manufacturing applications.

Item Type:

Journal Article

Journal or Publication Title:

Materials Science and Engineering: A

Additional Information:

This is the author’s version of a work that was accepted for publication in Materials Science and Engineering: A. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials Science and Engineering: A, 814, 2021 DOI: 10.1016/j.msea.2021.141238

Uncontrolled Keywords:

/dk/atira/pure/subjectarea/asjc/2200/2211

Subjects:

?? cracking problemlaser metal depositionnanoparticleni60ni–cr–b–si alloyalloyscracksdendrites (metallography)eutecticsfacingsmetal nanoparticlestexturescolumnar dendritescrack freecracking susceptibilityeutectic microstructurefacing alloysmicrostructures an ??

Departments:

Faculty of Science and Technology > Engineering

ID Code:

154111

Deposited By:

ep_importer_pure

Deposited On:

22 Apr 2021 15:45

Refereed?:

Yes

Published?:

Published