High temperature alloy for casting engine valves

Patent metadata

Field	Value
Publication number	US-10865466-B2
Application number	US-201916703331-A
Country	US
Kind code	B2
Filing date	Dec 4, 2019
Priority date	Dec 23, 2016
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

A high temperature alloy is disclosed. The high temperature alloy may have on a weight basis: about 9.0-10.0 weight % of Co, about 0.25 weight % maximum of Fe, about 8.0-9.0 weight % of Cr, about 4.75-5.50 weight % of Al, about 1.0-1.5 weight % of Ti, about 0-2.0 weight % of Mo, about 6.0-9.0 weight %, of W, about 0.12-0.18 weight % of C, about 0.01-0.03 weight % of Zr, about 0.005-0.015 weight % of B, about 0.5-1.5 weight % of Ta, a balance of Ni, and incidental impurities.

First claim

What is claimed is:

1. A high temperature alloy, comprising, on a weight basis:
Co: 9.0-10.0 weight %,
Cr: 8.0-9.0 weight %,
Al: 4.75-5.50 weight %,
Ti: 1.0-1.5 weight %,
Mo: 0-2.0 weight %,
W: 6.0-9.0 weight %,
C: 0.12-0.18 weight %,
Zr: 0.01-0.03 weight %,
B: 0.005-0.015 weight %,
Ta: 0.5-1.5 weight %, and
a balance of Ni and incidental impurities.

2. The high temperature alloy of claim 1 , wherein Cr is about 8.5 weight %.

3. The high temperature alloy of claim 2 , wherein Mo is about 1.75 weight %.

4. The high temperature alloy of claim 3 , wherein W is about 7.5 weight %.

5. The high temperature alloy of claim 4 , wherein Ta is about 1.25 weight %.

6. A high temperature alloy, comprising, on a weight basis:
Co: 4.0-7.0 weight %,
Cr: 15.0-17.0 weight %,
Al: 4.75-5.50 weight %,
Ti: 0.75-1.5 weight %,
Mo: 0-2.0 weight %,
Nb: 0-0.7 weight %,
W: 1.0-3.0 weight %,
C: 0.12-0.18 weight %,
Zr: 0.01-0.03 weight %,
B: 0.005-0.015 weight %,
Ta: 0.5-1.5 weight %, and
a balance of Ni and incidental impurities.

7. The high temperature alloy of claim 6 , including, on a weight basis:
Co: about 7.0 weight %,
Cr: about 16.0 weight %,
Al: about 5.0 weight %,
Ti: about 1.0 weight %,
Mo: about 1.5 weight %,
Nb: about 0.5 weight %,
W: about 1.5 weight %,
C: about 0.15 weight %,
Zr: about 0.02 weight %,
B: about 0.01 weight %,
Ta: about 1.0 weight %, and
a balance of Ni and incidental impurities.

8. The high temperature alloy of claim 7 , wherein a solidification temperature range of the high temperature alloy is between about 50° C. and about 60° C.

9. The high temperature alloy of claim 7 , wherein a shrinkage during solidification ranges between about 5% and 5.5%.

10. The high temperature alloy of claim 6 , including, on a weight basis:
Co: about 6.0 weight %,
Cr: about 16.0 weight %,
Al: about 5.0 weight %,
Ti: about 1.0 weight %,
Mo: about 0.5 weight %,
W: about 2.5 weight %,
C: about 0.15 weight %,
Zr: about 0.02 weight %,
B: about 0.01 weight %,
Ta: about 1.5 weight %, and
a balance of Ni and incidental impurities.

11. The high temperature alloy of claim 10 , wherein a solidification temperature range of the high temperature alloy is between about 50° C. and about 60° C.

12. The high temperature alloy of claim 10 , wherein a shrinkage during solidification ranges between about 5% and 5.5%.

13. The high temperature alloy of claim 5 , wherein the amount of y′ phase in the alloy ranges between about 50 weight % and 60 weight % at a temperature of about 800° C.

14. A high temperature alloy, comprising, on a weight basis:
Co: 3.0-7.5 weight %,
Cr: 15.0-17.0 weight %,
Al: 4.25-6.0 weight %,
Ti: 0.75-2.0 weight %,
Mo: 0-2.0 weight %,
Nb: 0-0.75 weight %,
W: 1.0-3.0 weight %,
C: 0.12-0.18 weight %,
Zr: 0.01-0.03 weight %,
B: 0.005-0.015 weight %,
Ta: 0.5-1.5 weight %, and
a balance of Ni and incidental impurities.

15. The alloy of claim 14 , including, on a weight basis:
Co: 6.0-7.0 weight %,
Cr: about 16.0 weight %,
Al: about 5.0 weight %,
Ti: about 1.0 weight %,
Mo: 0.5-1.5 weight %,
Nb: 0-0.5 weight %
W: 1.5-2.5 weight %,
C: about 0.15 weight %,
Zr: about 0.02 weight %,
B: about 0.01 weight %,
Ta: 1.0-1.5 weight %, and
a balance of Ni and incidental impurities.

16. The alloy of claim 15 , wherein Co is about 7.0 weight %.

17. The alloy of claim 16 , wherein Mo is about 1.5 weight %.

18. The alloy of claim 17 , wherein W is about 1.5 weight %.

19. The alloy of claim 18 , wherein Ta is about 1.0 weight %.

20. The high temperature alloy of claim 15 , wherein the amount of y′ phase in the alloy ranges between about 50 weight % and 60 weight % at a temperature of about 800° C.

Assignees

• Caterpillar Inc

Inventors

• Veliz Mark D
• Qiu Caian
• Yaniak Thomas J

Classifications

• C22C19/057 Primary

  with the maximum Cr content being less 10% · CPC title

• C22C19/056

  with the maximum Cr content being at least 10% but less than 20% · CPC title

• F16K51/00

  Other details not peculiar to particular types of valves or cut-off apparatus · CPC title

• F01L3/00

  Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof · CPC title

• F01L3/20

  Shapes or constructions of valve members, not provided for in preceding subgroups of this group · CPC title