http://www.cnr.it/ontology/cnr/individuo/prodotto/ID312547

Laser hardening of a AISI 52100 bearing steel with a discrete fiber laser spot (Contributo in atti di convegno)

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Laser hardening of a AISI 52100 bearing steel with a discrete fiber laser spot (Contributo in atti di convegno) (literal)

Anno

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Alternative label

Sorgente, Donato; Corizzo, Ottavio; Ancona, Antonio; Scintilla, Leonardo D.; Palumbo, Gianfranco; Tricarico, Luigi (2014)
Laser hardening of a AISI 52100 bearing steel with a discrete fiber laser spot
in Photonics West 2014 - Conference on High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications III, San Francisco, CA (USA), 4-6 February 2014
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Sorgente, Donato; Corizzo, Ottavio; Ancona, Antonio; Scintilla, Leonardo D.; Palumbo, Gianfranco; Tricarico, Luigi (literal)

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High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications III (literal)

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Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia 182, 70126 Bari, Italy CNR, Istituto di Fotonica e Nanotecnologie UOS Bari, Physics Department, Via Amendola, 173, 70126 Bari, Italy (literal)

Titolo

Laser hardening of a AISI 52100 bearing steel with a discrete fiber laser spot (literal)

Abstract

Surface hardening with discrete laser spot treatment is an interesting solution since the adoption of a single pulse allows the treatment of different surface geometries avoiding the effect of back tempering. The aim of this work is to find a suitable process window in which operate to get best results in terms of hardness, diameter and depth of the treated region. A single pulse out of a fiber laser source impinging on a bearing hypereutectoid steel was used using different power values, pulse energy and defocussing distances, in order to get the optimal process parameters. The dimensions of the hardened zone and its hardness were then acquired and related to the laser process parameters, to the prior microstructure of the steel (spheroidized and tempered after oil quenching) and to the roughness on the specimen before the laser treatment. Experimental results highlighted that both the surface condition (in terms of roughness) and the initial steel microstructure have a great influence on the achieved hardness values and on the dimension of the laser hardened layer. The pulse energy and power strongly affected the dimension of the hardened layer, too. (literal)

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