Process for making a component of a turbomachine, a component obtainable thereby and turbomachine comprising the same

Patent metadata

Field	Value
Publication number	US-11780010-B2
Application number	US-201716304578-A
Country	US
Kind code	B2
Filing date	May 25, 2017
Priority date	May 30, 2016
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

Turbomachines, as well as their components, are disclosed being in the field of production and treatment of oil and gas containing e.g. hydrocarbon plus hydrogen sulfide, carbon dioxide, with or without other contaminants. The components are made of a high corrosion high temperature resistant alloy, capable of resisting to corrosion and/or stress at high temperature better than state of art martensitic stainless steels and behaving similarly to premium nickel base superalloys, and at the same time showing a very improved hardness value.

First claim

What is claimed is:

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.

2. The process of claim 1 , further comprising, before the step d), a step d′) of homogenization of the alloy resulting from step c), at a temperature above 1100° C. for at least 6 hours.

3. The process of claim 2 , further comprising, before the step d) and after the step d′), a step d″) of hot or cold plastic deforming through at least one plastic deformation cycle.

4. The process of claim 1 , wherein the resulting alloy is further atomized to produce powder and then treated by a powder metallurgy process selected from Cold Isostatic Pressing (CIP), Metal Injection Molding (MIM), sintering, Hot Isostatic Pressing (HIP), or MIM and HIP process.

5. A process for making a component of a turbomachine, the process consisting of the steps of:
a) melting an alloy chemical composition comprising:

C
0.015
wt %

Si
0.09
wt %

Mn
0.3
wt %

Cr
20.4
wt %

Ni
36.2
wt %

Mo
3.7
wt %

Cu
1.41
wt %

Co
0.03
wt %

Al
0.25
wt %

Ti
2.04
wt %

Nb
0.27
wt %

W
0.1
wt %

Fe
balance

having the following impurities:

P
up to 0.013
wt %

S
up to 0.0002
wt %

B
up to 0.003
wt %

Bi
up to 0.3
ppm

Ca
up to 50
ppm

Mg
up to 30
ppm

Ag
up to 5
ppm

Pb
up to 5
ppm

N
up to 100
ppm

Sn
up to 50
ppm

O
up to 50
ppm

based on the composition weight, through vacuum induction melting (VIM), or arc
electric furnace,
b) refining by Argon Oxygen Decarburization (A.O.D.), Vacuum

Assignees

• Nuovo Pignone Tecnologie Srl
• Nuovo Pignone Tech Srl

Inventors

• Cappuccini Filippo
• Giannozzi Massimo
• Buccioni Massimiliano
• Di Pietro Domenico

Classifications

• C22F1/002

  by rapid cooling or quenching; cooling agents used therefor · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B22F5/009 Primary

  of turbine components other than turbine blades (of turbine blades B22F5/04) · CPC title

• B22F1/142

  Thermal or thermo-mechanical treatment · CPC title

• B22F9/082

  atomising using a fluid (using centrifugal force B22F9/10) · CPC title