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The Effect of Specific Energy Density on Microstructure and Corrosion Resistance of CoCrMo Alloy Fabricated by Laser Metal Deposition

With the development of modern medical implants, there are significantly increasing demands for personalized prosthesis. Corrosion-resistance and dense cobalt alloy specimens have been successfully fabricated by laser metal deposition. The relationship between specific energy density, microstructure...

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Detalles Bibliográficos
Autores principales: Li, Jinbao, Ren, Huijiao, Liu, Changsheng, Shang, Shuo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6515422/
https://www.ncbi.nlm.nih.gov/pubmed/31018539
http://dx.doi.org/10.3390/ma12081321
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author Li, Jinbao
Ren, Huijiao
Liu, Changsheng
Shang, Shuo
author_facet Li, Jinbao
Ren, Huijiao
Liu, Changsheng
Shang, Shuo
author_sort Li, Jinbao
collection PubMed
description With the development of modern medical implants, there are significantly increasing demands for personalized prosthesis. Corrosion-resistance and dense cobalt alloy specimens have been successfully fabricated by laser metal deposition. The relationship between specific energy density, microstructure and corrosion resistance of the specimens is investigated. The results show that higher specific energy density promotes the formation of columnar grain and leads to coarse grain size. The evolution and distribution of deposited microstructure from bottom to top are summarized in a metallographic sketch. The corrosion current of deposited specimens increases from 2.071 × 10(−6) A/cm(2) to 6.86 × 10(−5) A/cm(2) and rapidly drops to 9.88 × 10(−7) A/cm(2) with increase of specific energy density from 318.8 J/g to 2752.3 J/g. The columnar and equiaxed structure of deposited specimens have lower corrosion current than mixed structure due to finer grain and less Mo segregation. The deposited have low level metal released because of passive film. The passive film have different formation routes in Hank’s solution and acidic saliva. The specific energy density has an important effect on the microstructure of deposited, which improves corrosion resistance and life span in implant.
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spelling pubmed-65154222019-05-31 The Effect of Specific Energy Density on Microstructure and Corrosion Resistance of CoCrMo Alloy Fabricated by Laser Metal Deposition Li, Jinbao Ren, Huijiao Liu, Changsheng Shang, Shuo Materials (Basel) Article With the development of modern medical implants, there are significantly increasing demands for personalized prosthesis. Corrosion-resistance and dense cobalt alloy specimens have been successfully fabricated by laser metal deposition. The relationship between specific energy density, microstructure and corrosion resistance of the specimens is investigated. The results show that higher specific energy density promotes the formation of columnar grain and leads to coarse grain size. The evolution and distribution of deposited microstructure from bottom to top are summarized in a metallographic sketch. The corrosion current of deposited specimens increases from 2.071 × 10(−6) A/cm(2) to 6.86 × 10(−5) A/cm(2) and rapidly drops to 9.88 × 10(−7) A/cm(2) with increase of specific energy density from 318.8 J/g to 2752.3 J/g. The columnar and equiaxed structure of deposited specimens have lower corrosion current than mixed structure due to finer grain and less Mo segregation. The deposited have low level metal released because of passive film. The passive film have different formation routes in Hank’s solution and acidic saliva. The specific energy density has an important effect on the microstructure of deposited, which improves corrosion resistance and life span in implant. MDPI 2019-04-23 /pmc/articles/PMC6515422/ /pubmed/31018539 http://dx.doi.org/10.3390/ma12081321 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Jinbao
Ren, Huijiao
Liu, Changsheng
Shang, Shuo
The Effect of Specific Energy Density on Microstructure and Corrosion Resistance of CoCrMo Alloy Fabricated by Laser Metal Deposition
title The Effect of Specific Energy Density on Microstructure and Corrosion Resistance of CoCrMo Alloy Fabricated by Laser Metal Deposition
title_full The Effect of Specific Energy Density on Microstructure and Corrosion Resistance of CoCrMo Alloy Fabricated by Laser Metal Deposition
title_fullStr The Effect of Specific Energy Density on Microstructure and Corrosion Resistance of CoCrMo Alloy Fabricated by Laser Metal Deposition
title_full_unstemmed The Effect of Specific Energy Density on Microstructure and Corrosion Resistance of CoCrMo Alloy Fabricated by Laser Metal Deposition
title_short The Effect of Specific Energy Density on Microstructure and Corrosion Resistance of CoCrMo Alloy Fabricated by Laser Metal Deposition
title_sort effect of specific energy density on microstructure and corrosion resistance of cocrmo alloy fabricated by laser metal deposition
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6515422/
https://www.ncbi.nlm.nih.gov/pubmed/31018539
http://dx.doi.org/10.3390/ma12081321
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