High temperature alloy for casting engine valves

Patent metadata

Field	Value
Publication number	US-2020102629-A1
Application number	US-201916703331-A
Country	US
Kind code	A1
Filing date	Dec 4, 2019
Priority date	Dec 23, 2016
Publication date	Apr 2, 2020
Grant date	—

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

1 - 20 . (canceled)

21 . 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.

22 . The high temperature alloy of claim 21 , wherein Cr is about 8.5 weight %.

23 . The high temperature alloy of claim 22 , wherein Mo is about 1.75 weight %.

24 . The high temperature alloy of claim 23 , wherein W is about 7.5 weight %.

25 . The high temperature alloy of claim 24 , wherein Ta is about 1.25 weight %.

26 . 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.

27 . The high temperature alloy of claim 26 , 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.

28 . The high temperature alloy of claim 27 , wherein a solidification temperature range of the high temperature alloy is between about 50° C. and about 60° C.

29 . The high temperature alloy of claim 27 , wherein a shrinkage during solidification ranges between about 5% and 5.5%.

30 . The high temperature alloy of claim 26 , 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.

31 . The high temperature alloy of claim 30 , wherein a solidification temperature range of the high temperature alloy is between about 50° C. and about 60° C.

32 . The high temperature alloy of claim 30 , wherein a shrinkage during solidification ranges between about 5% and 5.5%.

33 . The high temperature alloy of claim 25 , wherein the amount of γ′ phase in the alloy ranges between about 50 weight % and 60 weight % at a temperature of about 800° C.

34 . 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.

35 . The alloy of claim 34 , 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.

36 . The alloy of claim 35 , wherein Co is about 7.0 weight %.

37 . The alloy of claim 36 , wherein Mo is about 1.5 weight %.

38 . The alloy of claim 37 , wherein W is about 1.5 weight %.

39 . The alloy of claim 38 , wherein Ta is about 1.0 weight %.

40 . The high temperature alloy of claim 35 , wherein the amount of γ′ 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

• F01L3/20

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

• C22C19/056

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

• C22C19/057 Primary

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

• F01L3/02

  Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials · CPC title