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2021 (engelsk)Inngår i: Materials, E-ISSN 1996-1944, Vol. 14, nr 23, artikkel-id 7170Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]
A systematic four-stage methodology was developed and applied to the Laser Metal Deposition with Wire (LMDw) of a duplex stainless steel (DSS) cylinder > 20 kg. In the four stages, single-bead passes, a single-bead wall, a block, and finally a cylinder were produced. This stepwise approach allowed the development of LMDw process parameters and control systems while the volume of deposited material and the geometrical complexity of components increased. The as-deposited microstructure was inhomogeneous and repetitive, consisting of highly ferritic regions with nitrides and regions with high fractions of austenite. However, there were no cracks or lack of fusion defects; there were only some small pores, and strength and toughness were comparable to those of the corresponding steel grade. A heat treatment for 1 h at 1100 degrees (C) was performed to homogenize the microstructure, remove nitrides, and balance the ferrite and austenite fractions compensating for nitrogen loss occurring during LMDw. The heat treatment increased toughness and ductility and decreased strength, but these still matched steel properties. It was concluded that implementing a systematic methodology with a stepwise increase in the deposited volume and geometrical complexity is a cost-effective way of developing additive manufacturing procedures for the production of significantly sized metallic components.
sted, utgiver, år, opplag, sider
MDPI, 2021
Emneord
Additives; Austenite; Cost effectiveness; Cylinders (shapes); Deposition; Ferrite; Heat treatment; Metals; Microstructure; Nitrides; Stainless steel, Geometrical complexity; Laser metal deposition; Methodology; Microstructure characterization; Process parameters; Stainless steel cylinders; Steel components; Stepwise approach; Systematic methodology; Wires process, 3D printers
HSV kategori
Forskningsprogram
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-17911 (URN)10.3390/ma14237170 (DOI)000735440900001 ()2-s2.0-85120057286 (Scopus ID)
Forskningsfinansiär
Knowledge Foundation, 20170060
2021-12-302021-12-302024-07-04