US 11,780,010 B2
Process for making a component of a turbomachine, a component obtainable thereby and turbomachine comprising the same
Filippo Cappuccini, Florence (IT); Massimo Giannozzi, Florence (IT); Massimiliano Buccioni, Florence (IT); and Domenico Di Pietro, Florence (IT)
Assigned to Nuovo Pignone Technologie SRL, Florence (IT)
Appl. No. 16/304,578
Filed by NUOVO PIGNONE TECNOLOGIE SRL, Florence (IT)
PCT Filed May 25, 2017, PCT No. PCT/EP2017/062716
§ 371(c)(1), (2) Date Nov. 26, 2018,
PCT Pub. No. WO2017/207414, PCT Pub. Date Dec. 7, 2017.
Claims priority of application No. 102016000055824 (IT), filed on May 30, 2016.
Prior Publication US 2019/0201972 A1, Jul. 4, 2019
Int. Cl. B22F 1/00 (2022.01); B22F 9/08 (2006.01); B22F 5/00 (2006.01); C22C 30/02 (2006.01); C21D 6/00 (2006.01); F01D 5/28 (2006.01); C21D 1/18 (2006.01); C22C 38/52 (2006.01); C22C 38/04 (2006.01); C21D 6/02 (2006.01); C22C 19/05 (2006.01); C22C 38/02 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/50 (2006.01); C22C 38/06 (2006.01); C22C 38/00 (2006.01); C22C 30/00 (2006.01); C22C 38/48 (2006.01); B22F 1/142 (2022.01); B22F 3/15 (2006.01); B22F 3/22 (2006.01); B22F 3/04 (2006.01); F04D 29/02 (2006.01); B22F 3/10 (2006.01)
CPC B22F 5/009 (2013.01) [B22F 1/142 (2022.01); B22F 9/082 (2013.01); C21D 1/18 (2013.01); C21D 6/004 (2013.01); C21D 6/02 (2013.01); C22C 19/055 (2013.01); C22C 19/056 (2013.01); C22C 30/00 (2013.01); C22C 30/02 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); F01D 5/28 (2013.01); B22F 3/04 (2013.01); B22F 3/10 (2013.01); B22F 3/15 (2013.01); B22F 3/225 (2013.01); B22F 2301/35 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01); F04D 29/02 (2013.01); F05D 2300/17 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A process for making a component of a turbomachine, the process comprising the steps of:
a) melting an alloy chemical composition consisting of:
 
 
 C 0.005-0.03 wt %
 
 Si 0.05-0.5 wt %
 
 Mn 0.1-1.0 wt %
 
 Cr 19.5-22.5 wt %
 
 Ni 34.0-38.0 wt %
 
 Mo 3.0-5.0 wt %
 
 Cu 1.0-2.0 wt %
 
 Co 0.0-1.0 wt %
 
 Al 0.01-0.5 wt %
 
 Ti 1.8-2.5 wt %
 
 Nb 0.2-1.0 wt %
 
 W 0.0-1.0 wt %
 
based on the composition weight, the remaining being Fe and impurities, the impurities comprising S 0.0-0.01 wt % and P 0.0-0.025 wt %, through vacuum induction melting (VIM), or arc electric furnace,
b) refining by Argon Oxygen Decarburization (A.O.D.), Vacuum Induction Degassing and Pouring (V.I.D.P), or Vacuum Oxygen Decarburization (V.O.D.),
c) re-melting through electro-slag re-melting (E.S.R.), or vacuum arc re-melting (VAR),
d) heat-treating the alloy resulting from step c) to induce solubilization through at least one heat cycle, at a temperature of 1020-1150° C., and followed by fast cooling in liquid or gas media, and
e) ageing by heating to a temperature of 600-700° C. for 2-20 h, and
f) immediately cooling the alloy resulting from step e) at room temperature.