Numerical and experimental investigation of the discrete spot laser hardening of a graphite-coated hypereutectoid steel using a fibre laser

Tricarico, LuigiDMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy; CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy (författare)

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)
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.

TEKNIK OCH TEKNOLOGIER Materialteknik Bearbetnings-, yt- och fogningsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Manufacturing, Surface and Joining Technology hsv//eng
TEKNIK OCH TEKNOLOGIER Maskinteknik Tribologi hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Tribology hsv//eng
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
Manufacturing and materials engineering
Produktions- och materialteknik
Production Technology
Produktionsteknik

Ancona, Antonio,1974-Högskolan Väst,Avdelningen för produktionssystem (PS),CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy,PTW(Swepub:hv)antanc (författare)
Palumbo, GianfrancoDMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy; CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy (författare)
Sorgente, DonatoNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy; Università degli Studi della Basilicata, School of Engineering, Via Ateneo Lucano, 10, Potenza, 85100, Italy (författare)
Corizzo, OttavioDMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy (författare)
Spina, RobertoDMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy; CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy (författare)
Lugara, Pietro MarioCNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, Italy; Università degli Studi e Politecnico di Bari, Dipartimento di Fisica, Via Amendola 173, Bari, 70126, Italy (författare)
DMMM, Politecnico di Bari, Viale Japigia 182, Bari, 70126, Italy; CNR-IFN UOS Bari, Via Amendola 173, Bari, 70126, ItalyAvdelningen för produktionssystem (PS) (creator_code:org_t)

Ingår i:The International Journal of Advanced Manufacturing Technology: Springer Science and Business Media LLC104:1-4, s. 1393-14020268-37681433-3015

Av författaren/redakt...: Tricarico, Luigi; Ancona, Antonio, ...; Palumbo, Gianfra ...; Sorgente, Donato; Corizzo, Ottavio; Spina, Roberto; visa fler...; Lugara, Pietro M ...; visa färre...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Bearbetnings yt ...

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Maskinteknik; och Tribologi

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