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Open AccessArticle

A357 Alloy by LPBF for Industry Applications

Center for Sustainable Futures Technologies CSFT @Polito, Istituto Italiano di Tecnologia, Via Livorno 60, 10145 Torino, Italy
Wärtsilä Italia S.p.A, Bagnoli della Rosandra 334, 34018 San Dorligo della Valle (TS), Italy
DIGEP–Dipartimento di Ingegneria Gestionale e della Produzione, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
DISAT–Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1488; (registering DOI)
Received: 3 March 2020 / Revised: 21 March 2020 / Accepted: 24 March 2020 / Published: 25 March 2020
The aim of this study is to define the process parameters to build components for industrial applications in A357 alloy by Laser Powder Bed Fusion (LPBF) and to evaluate the effects of post-processing heat treatments on the microstructure and mechanical properties in order to obtain the highest hardness and strength. First, process parameters values were defined to obtain full dense components with highest productivity. Then samples were built for microstructural, hardness, and tensile strength investigation in different conditions: as-built, after a stress-relieving treatment, and after a T6 precipitation hardening treatment. For this latest treatment, different time and temperatures for solution and ageing were investigated to find the best in terms of final hardness achievable. It is demonstrated that samples in A357 alloy can be successfully fabricated by LPBF with a density of 99.9% and a mean hardness value achievable of 116 HV0.1, in as-built condition. However, for production purposes, it is fundamental to reduce the residual stresses typical of LPBF. It was shown that a similar hardness value could be obtained after a stress-relieving treatment followed by a proper T6 treatment, together with a coarser but more isotropic microstructure. View Full-Text
Keywords: laser powder bed fusion (LPBF); A357; heat treatment; solution; ageing laser powder bed fusion (LPBF); A357; heat treatment; solution; ageing
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Lorusso, M.; Trevisan, F.; Calignano, F.; Lombardi, M.; Manfredi, D. A357 Alloy by LPBF for Industry Applications. Materials 2020, 13, 1488.

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