Wear mechanisms and in-service surface modifications of a Stellite 6B Co–Cr alloy
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| Title: | Wear mechanisms and in-service surface modifications of a Stellite 6B Co–Cr alloy |
|---|---|
| Authors: | Sebastiani, M. marco.sebastiani@stm.uniroma3.it, Mangione, V.1, De Felicis, D.1, Bemporad, E.1, Carassiti, F.1 |
| Source: | Wear. 6/30/2012, Vol. 290/291, p10-17. 8p. |
| Subjects: | Fracture mechanics, Cobalt alloys, Surfaces (Technology), Microstructure, Focused ion beams, Transmission electron microscopy, Indentation (Materials science) |
| Abstract: | Abstract: In the present paper, the in-service wear mechanisms and cross-sectional microstructural evolution of a Stellite 6B cobalt-based alloy subjected to sliding contact conditions were analysed by focused ion beam (FIB), transmission electron microscopy (TEM) and nanoindentation techniques. Samples under investigation consisted of a lip-seal adopted in a tunnel boring machine (TBM). In the working conditions, the lip-seal is in sliding contact with a rubber seal in a pressurised oil environment. In this specific case, an unexpected low wear resistance was observed during service, and a long machine downtime was necessary to remove the component. Results of FIB-SEM/EDS characterisation showed deep grooving due to sand (SiO2) particles embedded in the rubber seal inside the contact area, while three-body abrasive wear is observed immediately outside it. Microstructural evaluation of Stellite 6 B Co-based alloy of the cross-section also showed the presence of a nano-crystalline hardened layer with diffuse presence of stacking faults. The presence of a tribo-film with a complex structure was also clearly observed. It is concluded that wear resistance of such components could be significantly enhanced either by a proper control of abrasive contaminant particles in the lubricant oil or by introducing surface microstructural modifications of the component (e.g. a nanostructured thick coating). [Copyright &y& Elsevier] |
| Copyright of Wear is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 77460064 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Wear mechanisms and in-service surface modifications of a Stellite 6B Co–Cr alloy – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Sebastiani%2C+M%2E%22">Sebastiani, M.</searchLink><i> marco.sebastiani@stm.uniroma3.it</i><br /><searchLink fieldCode="AR" term="%22Mangione%2C+V%2E%22">Mangione, V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22De+Felicis%2C+D%2E%22">De Felicis, D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bemporad%2C+E%2E%22">Bemporad, E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Carassiti%2C+F%2E%22">Carassiti, F.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Wear%22">Wear</searchLink>. 6/30/2012, Vol. 290/291, p10-17. 8p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Fracture+mechanics%22">Fracture mechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Cobalt+alloys%22">Cobalt alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Surfaces+%28Technology%29%22">Surfaces (Technology)</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Focused+ion+beams%22">Focused ion beams</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Indentation+%28Materials+science%29%22">Indentation (Materials science)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: In the present paper, the in-service wear mechanisms and cross-sectional microstructural evolution of a Stellite 6B cobalt-based alloy subjected to sliding contact conditions were analysed by focused ion beam (FIB), transmission electron microscopy (TEM) and nanoindentation techniques. Samples under investigation consisted of a lip-seal adopted in a tunnel boring machine (TBM). In the working conditions, the lip-seal is in sliding contact with a rubber seal in a pressurised oil environment. In this specific case, an unexpected low wear resistance was observed during service, and a long machine downtime was necessary to remove the component. Results of FIB-SEM/EDS characterisation showed deep grooving due to sand (SiO2) particles embedded in the rubber seal inside the contact area, while three-body abrasive wear is observed immediately outside it. Microstructural evaluation of Stellite 6 B Co-based alloy of the cross-section also showed the presence of a nano-crystalline hardened layer with diffuse presence of stacking faults. The presence of a tribo-film with a complex structure was also clearly observed. It is concluded that wear resistance of such components could be significantly enhanced either by a proper control of abrasive contaminant particles in the lubricant oil or by introducing surface microstructural modifications of the component (e.g. a nanostructured thick coating). [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Wear is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.wear.2012.05.027 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 10 Subjects: – SubjectFull: Fracture mechanics Type: general – SubjectFull: Cobalt alloys Type: general – SubjectFull: Surfaces (Technology) Type: general – SubjectFull: Microstructure Type: general – SubjectFull: Focused ion beams Type: general – SubjectFull: Transmission electron microscopy Type: general – SubjectFull: Indentation (Materials science) Type: general Titles: – TitleFull: Wear mechanisms and in-service surface modifications of a Stellite 6B Co–Cr alloy Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Sebastiani, M. – PersonEntity: Name: NameFull: Mangione, V. – PersonEntity: Name: NameFull: De Felicis, D. – PersonEntity: Name: NameFull: Bemporad, E. – PersonEntity: Name: NameFull: Carassiti, F. IsPartOfRelationships: – BibEntity: Dates: – D: 30 M: 06 Text: 6/30/2012 Type: published Y: 2012 Identifiers: – Type: issn-print Value: 00431648 Numbering: – Type: volume Value: 290/291 Titles: – TitleFull: Wear Type: main |
| ResultId | 1 |
