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Numerical and experimental investigation of the discrete spot laser hardening of a graphite-coated hypereutectoid steel using a fibre laser
DMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy; CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy.
University West, Department of Engineering Science, Division of Production Systems. CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy.ORCID iD: 0000-0002-6247-5429
DMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy; CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy.
NR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy; Università degli Studi della Basilicata, School of Engineering, Via Ateneo Lucano, 10, Potenza, 85100, Italy .
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2019 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 104, no 1-4, p. 1393-1402Article in journal (Refereed) Published
Abstract [en]

The single-pulse laser hardening of a hypereutectoid steel coated by a graphite layer was investigated using a numerical/experimental approach. Experimental tests were conducted on coated samples using a fibre laser source and without any gas shielding aiming to explore the effect of laser power, pulse energy and defocusing distance on the dimensions of the hardened region. The process operating window of the discrete spot laser hardening using the graphite layer was determined through a finite element model and compared with previous results obtained on uncoated samples. For the same laser power and interaction times, an enlargement of the hardened region was found when using the graphite coating, especially when operating at the lowest laser energy level. The process operating window remains similar in shape to the one of the uncoated steel but moves towards larger hardened diameters and much larger defocusing distances. Once the maximum temperature has been fixed, a linear relationship between the hardened diameter and the defocusing distance exists. No obvious surface oxidation occurs since the graphite coating acts as a protective layer. © 2019, Springer-Verlag London Ltd., part of Springer Nature.

Place, publisher, year, edition, pages
2019. Vol. 104, no 1-4, p. 1393-1402
Keywords [en]
Coatings; Fiber lasers; Finite element method; Graphite; Steel fibers, Experimental investigations; Hypereutectoid steel; Laser energy levels; Laser hardening; Linear relationships; Maximum temperature; Surface oxidations; Surface structuring, Hardening
National Category
Manufacturing, Surface and Joining Technology Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-14480DOI: 10.1007/s00170-019-04014-4ISI: 000483808200100Scopus ID: 2-s2.0-85068736856OAI: oai:DiVA.org:hv-14480DiVA, id: diva2:1357078
Note

Funders: Italian Ministry of Education, Universities and Research Government  (grants PON01_02584, project acronym: SMATI; PON01_02238, project acronym: EURO6; and PON02_00576_3333604, project acronym: INNOVHEAD)

Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-15

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Ancona, Antonio

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Manufacturing, Surface and Joining TechnologyTribology (Interacting Surfaces including Friction, Lubrication and Wear)

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