	US 12,065,716 B2
	Method for the additive production of an article
Antonella Dimatteo, Florence (IT)
Assigned to Nuovo Pignone Tecnologie—S.R.L., Florence (IT)
Filed by NUOVO PIGNONE TECNOLOGIE—S.r.l., Florence (IT)
Filed on May 14, 2021, as Appl. No. 17/320,831.
Application 17/320,831 is a continuation of application No. PCT/EP2019/025400, filed on Nov. 18, 2019.
Prior Publication US 2021/0269895 A1, Sep. 2, 2021
Int. Cl. C22C 1/04 (2023.01); B22F 10/28 (2021.01); B22F 10/36 (2021.01); B22F 10/366 (2021.01); B22F 10/37 (2021.01); B22F 12/41 (2021.01); B23K 26/34 (2014.01); B23K 26/342 (2014.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01); C22C 19/05 (2006.01); B23K 26/082 (2014.01); B23K 101/00 (2006.01)

CPC C22C 1/0433 (2013.01) [B22F 10/28 (2021.01); B22F 10/36 (2021.01); B22F 10/366 (2021.01); B22F 10/37 (2021.01); B22F 12/41 (2021.01); B23K 26/342 (2015.10); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B33Y 80/00 (2014.12); C22C 19/055 (2013.01); B22F 2301/15 (2013.01); B23K 26/082 (2015.10); B23K 2101/001 (2018.08)]

10 Claims

1. A method for the additive production of a three-dimensional metal alloy article, comprising the steps of:

i. preparing a layer of powder of a metal alloy on a substrate;

ii. subjecting the powder layer prepared in the previous step to scanning with an energy source so as to melt the powder in at least one point of the layer and removing the source of energy from said point so as to solidify the metal alloy and form a layer with a desired shape;

iii. re-preparing a layer of metal alloy powder, which is in direct contact with the solidified metal alloy layer obtained in step ii; and

iv. repeat the steps ii. and iii. until the desired three-dimensional metal alloy object is obtained,

wherein said metal alloy powder has a weight composition, with respect to the total weight of the powder, from about 22% to about 23% chromium, from about 18% to about 20% cobalt, from about 1.5% to about 2.5% tungsten, from about 0.5% to about 1.5% niobium, from about 1.8% to about 2.7% titanium, from about 1.0% to about 2.0% aluminum, from about 0.02% to about 1.20% tantalum, from about 0.04% to about 0.2% carbon, and the remaining to 100% is nickel and inevitable impurities.