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Discrete spot laser hardening and remelting with a high-brilliance source for surface structuring of a hypereutectoid steel
DMMM – Politecnico di Bari, viale Japigia 182, Bari, Italy.
University West, Department of Engineering Science, Division of Production System. CNR-IFN UOS Bari, via Amendola 173, 70126 Bari, Italy.
DMMM – Politecnico di Bari, viale Japigia 182, Bari, Italy.
CNR-IFN UOS Bari, via Amendola 173, Bari, Italy.
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2017 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 115, 194-202 p.Article in journal (Refereed) Published
Abstract [en]

In this work the single-pulse laser irradiation of a hypereutectoid steel was investigated using a fiber laser source, in a range of process parameters enabling surface hardening and remelting. Effects of laser power, pulse energy and defocusing distance were investigated using a numerical/experimental approach. Laser surface treatments were conducted on uncoated samples without any gas shielding, changing both the laser power and the pulse energy, and exploring a wide range of defocusing distances. Numerical simulations were conducted using a finite element model calibrated by means of an optimization procedure based on a specific calculation algorithm and using a subset of experimental data producing surface melting. Using both simulations and experiments, the process operating windows of the discrete spot laser treatment were determined: it was found that, when varying the laser power between 250 W and 750 W, melt-free hardened zones are produced with a maximum extension between 0.7 mm and 1.0 mm; on the contrary, in case of more tightly beam focusing conditions, surface melting occurred with a size of the re-melted areas ranging between 1.0 mm and 1.4 mm. Results further showed that a small change (generally 2–3 mm) of the defocusing distance suddenly brings the material from melting to a non-hardening condition. © 2016 Elsevier Ltd

Place, publisher, year, edition, pages
2017. Vol. 115, 194-202 p.
Keyword [en]
Fiber lasers; Finite element method; Hardening; Laser heating; Melting; Remelting; Steel fibers; Surface structure, Calculation algorithms; Hypereutectoid steel; Laser hardening; Laser re-melting; Laser surface treatment; Optimization procedures; Process parameters; Surface structuring, Laser windows
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-10268DOI: 10.1016/j.matdes.2016.10.079ISI: 000390654500022ScopusID: 2-s2.0-84996878203OAI: oai:DiVA.org:hv-10268DiVA: diva2:1057194
Available from: 2016-12-16 Created: 2016-12-14 Last updated: 2017-01-19Bibliographically approved

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