Nickel-based superalloy, mechanical component made of the above mentioned super alloy, piece of turbomachinery which includes the above mentioned component and related methods
A nickel-based superalloy particularly suitable for the fabrication of mechanical components for a piece of turbomachinery that it comprises the following elements in percentage by weight: chromium between 3% and 7%; tungsten between 3% and 15%; tantalum between 4% and 6%; aluminum between 4% and 8%; carbon less than 0.8%; the remaining percentage of nickel plus impurities.
1. A nickel-based superalloy particularly suitable for the fabrication of mechanical components for a piece of turbomachinery, the superalloy consisting of in percentage by weight:
chromium between 4% and 6%;
tungsten between 3% and 15%;
tantalum between 4.5% and 5.5%;
aluminium between 5% and 7%;
carbon less than 0.1%;
yttrium oxide present in a percentage by volume of up to 7%;
optionally cobalt in less than 5%;
optionally one or more of hafnium or zirconium up to a total of 2%;
optionally rhenium between 0% and 10%;
the remaining percentage of nickel plus impurities.
2. The superalloy according to claim 1 , wherein the rhenium is present according to the following percentage by weight: between 0% and 10%.
3. The superalloy according to claim 2 , wherein the tungsten is in percentage by weight between 4% and 6%, wherein the sum of the percentage by weight of the tungsten and the rhenium is 10%, and wherein the percentage by weight of the tungsten is inversely proportional to the percentage by weight of the rhenium.
4. The superalloy according to claim 1 , wherein the tungsten is in percentage by weight between 9% and 11%.
5. A mechanical component for a piece of turbomachinery fabricated from a nickel-based superalloy according to claim 1 .
6. A piece of turbomachinery comprising at least one mechanical component according to claim 5 .
7. The superalloy according to claim 1 , wherein the rhenium is present according to the following percentage by weight: between 3% and 7%.
8. The superalloy according to claim 1 , wherein the rhenium is present according to the following percentage by weight: between 4% and 6%.
9. A nickel-based superalloy consisting of, in percentage by weight:
chromium between 4% and 6%;
tungsten between 3% and 15%;
tantalum between 4.5% and 5.5%;
aluminium between 5% and 7%;
carbon less than 0.1%;
yttrium oxide present in a percentage by volume of 0.5% to 2%;
optionally cobalt in less than 5%;
optionally one or more of hafnium or zirconium up to a total of 2%;
optionally rhenium between 0% and 10%;
the remaining percentage of nickel plus impurities;
wherein said superalloy is characterized by oxidation resistance at 1200° C. while in use as a turbomachine component.
10. A method for fabricating a nickel-based superalloy, wherein the method consists of mixing in percentage by weight:
chromium between 4% and 6%;
tungsten between 3% and 15%;
tantalum between 4.5% and 5.5%;
aluminium between 5% and 7%;
carbon less than 0.1%;
yttrium oxide present in a percentage by volume of up to 7%;
rhenium in percentage by weight between 0% and 10%;
optionally cobalt in less than 5%;
optionally one or more of hafnium or zirconium up to a total of 2%;
the remaining percentage of nickel plus impurities.
11. A mechanical component for a piece of turbomachinery fabricated from a nickel-based superalloy fabricated by a method according to claim 10 .
12. A piece of turbomachinery comprising at least one mechanical component according to claim 11 .
13. The method according to claim 10 , wherein the rhenium is mixed in percentage by weight between 3% and 7%.
14. The method according to claim 10 , wherein the rhenium is mixed in percentage by weight between 4% and 6%.
15. The method according to claim 10 , wherein the tungsten is mixed in percentage by weight between 9% and 11%.
16. The method according to claim 10 , wherein the tungsten is mixed in percentage by weight between 4% and 6%, wherein the sum of the percentage by weight of the tungsten and the rhenium is 10%, and wherein the percentage by weight of the tungsten is inversely proportional to the percentage by weight of the rhenium.