US 12,109,611 B2
Part comprising an optimized steel material and its manufacturing process
Olivier Hercher, Fontenay les Bris (FR); Marine Chaussiniac, Saint Laurent des Arbres (FR); Jérôme Pradel, Saint Maximin la Sainte Baume (FR); Aziz Chniouel, Cavaillon (FR); Hicham Maskrot, Montlhery (FR); Fernando Lomello, Gif-sur-Yvette (FR); Pierre-François Giroux, Antony (FR); and Pascal Aubry, Paris (FR)
Assigned to COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
Filed by COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
Filed on Nov. 6, 2020, as Appl. No. 17/091,584.
Claims priority of application No. 19 12536 (FR), filed on Nov. 7, 2019.
Prior Publication US 2021/0140025 A1, May 13, 2021
Int. Cl. B22F 10/00 (2021.01); B22F 1/06 (2022.01); B22F 3/15 (2006.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/58 (2006.01)
CPC B22F 10/00 (2021.01) [B22F 1/06 (2022.01); B22F 3/15 (2013.01); B33Y 80/00 (2014.12); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/58 (2013.01); B22F 2301/35 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); C21D 2211/001 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A part, comprising:
a steel material comprising grains comprising a matrix into which precipitates are incorporated,
wherein the steel material comprises, in weight percentage
16% to 20% chrome,
8% to 14% nickel,
0.001% to 0.030% carbon,
0.001% to 0.050% oxygen,
0% to 2% manganese,
0% to 3% molybdenum,
0% to 1% silicon, and
iron; and
wherein the precipitates comprise a metallic element comprising yttrium, titanium, iron, chromium, tungsten, silicon, zirconium, thorium, magnesium, manganese, aluminum, hafnium, and/or molybdenum,
wherein the steel material has a microstructure of equiaxed grains having an average grain size average size in a range of from 10 μm to 50 μm in the largest dimension Dmax and/or a smallest dimension D,
wherein the grains of the steel material are equiaxed in a plane which is parallel to superimposed layers resulting from an additive manufacturing process,
wherein the grains of the steel material are equiaxed in a plane which is perpendicular to the superimposed layers resulting from the additive manufacturing process,
wherein an average density with which the precipitates are distributed in the matrix of the steel material is in a range of from 2 to 100 precipitates/μm3, and
wherein the part has a cellular structure or a honeycomb structure.