Bcc materials of titanium, aluminum, niobium, vanadium, and molybdenum, and products made therefrom

Patent metadata

Field	Value
Publication number	US-2017306450-A1
Application number	US-201715496707-A
Country	US
Kind code	A1
Filing date	Apr 25, 2017
Priority date	Apr 25, 2016
Publication date	Oct 26, 2017
Grant date	—

Abstract

New beta-style (bcc) titanium alloys are disclosed. The new alloys generally include 4-8 wt. % Al, 4-8 wt. % Nb, 4-8 wt. % V, 1-5 wt. % Mo, optionally 2-6 wt. % Cr, the balance being titanium, optional incidental elements, and unavoidable impurities. The new alloys may realize an improved combination of properties as compared to conventional titanium alloys.

First claim

1 . A titanium alloy comprising:
4-8 wt. % Al; 4-8 wt. % Nb; 4-8 wt. % V; 1-5 wt. % Mo; and optionally 2-6 wt. % Cr; the balance being Ti, optional incidental elements, and unavoidable impurities.

2 . The titanium alloy of claim 1 , wherein the titanium alloy includes a sufficient amount of the Ti, the Al, the Nb, the V, the Mo, and the optional Cr to realize a beta transus temperature of not greater than 850° C.

3 . The titanium alloy of claim 1 , wherein the alloy includes at least 5.0 wt. % Al.

4 . The titanium alloy of claim 3 , wherein the alloy includes not greater than 7.0 wt. % Al.

5 . The titanium alloy of claim 1 , wherein the alloy includes at least 5.0 wt. % Nb.

6 . The titanium alloy of claim 5 , wherein the alloy includes not greater than 7.0 wt. % Nb.

7 . The titanium alloy of claim 1 , wherein the alloy includes at least 5.0 wt. % V.

8 . The titanium alloy of claim 7 , wherein the alloy includes not greater than 7.0 wt. % V.

9 . The titanium alloy of claim 1 , wherein the alloy includes at least 2.0 wt. % Mo.

10 . The titanium alloy of claim 9 , wherein the alloy includes not greater than 4.0 wt. % Mo.

11 . The titanium alloy of claim 1 , wherein the alloy includes 2-6 wt. % Cr.

12 . The titanium alloy of claim 11 , wherein the alloy includes at least 3.0 wt. % Cr.

13 . The titanium alloy of claim 12 , wherein the alloy includes not greater than 5.0 wt. % Cr.

14 . The titanium alloy of claim 1 , wherein the titanium alloy is a titanium alloy body.

15 . The titanium alloy body of claim 13 , wherein the titanium alloy body is one of an ingot, a rolled product, an extrusion, a forging, a shape casting, or an additively manufactured product.

16 . A method comprising:
(i) using a feedstock in an additive manufacturing apparatus, wherein the feedstock comprises:
4-8 wt. % Al;
4-8 wt. % Nb;
4-8 wt. % V;
1-5 wt. % Mo; and
optionally 2-6 wt. % Cr;
the balance being Ti, optional incidental elements, and unavoidable impurities; (ii) producing a metal product in the additive manufacturing apparatus using the feedstock.

17 . The method of claim 16 , wherein the feedstock comprises a powder feedstock, wherein the method comprises:
(a) dispersing a metal powder of the powder feedstock in a bed and/or spraying a metal powder of the powder feedstock towards or on a substrate; (b) selectively heating a portion of the metal powder above its liquidus temperature, thereby forming a molten pool; (c) cooling the molten pool, thereby forming a portion of the metal product, wherein the cooling comprises cooling at a cooling rate of at least 100° C. per second; and (d) repeating steps (a)-(c) until the metal product is completed.

18 . The method of claim 16 , wherein the feedstock comprises a wire feedstock, wherein the method comprises:
(a) using a radiation source to heat the wire feedstock above its liquidus point, thereby creating a molten pool; (b) cooling the molten pool at a cooling rate of at least 1000° C. per second; and (c) repeating steps (a)-(b) until the metal product is completed.

19 . The method of claim 16 , comprising cooling at a rate sufficient to form at least one precipitate phase, wherein the at least one precipitate phase comprises Ti 3 Al.

20 . The method of claim 19 , wherein the metal product comprises at least 0.5 vol. % of Ti 3 Al.

Assignees

• Arconic Inc

Inventors

• Lin Jen C
• Yan Xinyan
• Sabol Joseph C
• Heard David W
• Zarandi Faramarz Mh
• Cambier Severine
• Sun Fusheng
• Crist Jr Ernest M
• Tamirisakandala Sesh A

Classifications

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• C22C14/00 Primary

  Alloys based on titanium · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B22F2301/205

  Titanium, zirconium or hafnium · CPC title

• C22F1/183

  of titanium or alloys based thereon · CPC title