Ti—Fe-based sintered alloy material and method for producing same

Patent metadata

Field	Value
Publication number	US-11084093-B2
Application number	US-201916396245-A
Country	US
Kind code	B2
Filing date	Apr 26, 2019
Priority date	Jun 12, 2018
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A Ti—Fe-based sintered alloy material including two phases of an α phase and a β phase, in which a content of iron is 0.5% or more and 7% or less on a weight basis, a β phase containing an iron component is dispersed in an independent state in an α phase, an area ratio of the β phase containing an iron component is 60% or less of an entire area, and an equiaxed crystal grain is contained in the α phase.

First claim

What is claimed is:

1. A Ti—Fe-based sintered alloy material comprising two phases of an α phase and a β phase, wherein
a content of iron is 0.5% or more and 7% or less on a weight basis,
a β phase containing an iron component is dispersed in an independent state in an α phase,
an area ratio of the β phase containing an iron component is 60% or less of an entire area, and
oxygen is contained in both said α phase and said β phase in a solid solution form,
an equiaxed crystal grain is contained in the α phase.

2. The Ti—Fe-based sintered alloy material according to claim 1 , wherein a content of said iron is 1% or more and 6% or less on a weight basis.

3. The Ti—Fe-based sintered alloy material according to claim 1 , wherein
a content of said oxygen is 0.15% or more and 1.5% or less on a weight basis.

4. The Ti—Fe-based sintered alloy material according to claim 1 , wherein
a relational expression below, where [Fe] denotes a content of said iron and [O] denotes a content of said oxygen, is satisfied.
[O]≤−0.335[Fe]+2.83  (Expression 1)

5. The Ti—Fe-based sintered alloy material according to claim 1 , wherein
a relational expression below, where [Fe] denotes a content of said iron and [O] denotes a content of said oxygen, is satisfied.
[O]≤−0.1725[Fe]+1.53  (Expression 2)

6. A method for producing a Ti—Fe-based sintered alloy material, comprising the steps of:
molding, solidifying, and sintering a mixed powder containing a titanium powder containing Ti as a main component and an iron particle;
subjecting a sintered body after said sintering to hot plastic working in a temperature region in which an α phase and a β phase exist together; and
naturally cooling a sintered body after said hot plastic working in an air atmosphere, wherein
an area ratio of the β phase containing an iron component is 60% or less of an entire area,
a content of iron is 0.5% or more and 7% or less on a weight basis,
oxygen is contained in both said α phase and said β phase in a solid solution form, and
an equiaxed crystal grain is contained in the α phase.

7. The method for producing a Ti—Fe-based sintered alloy material according to claim 6 , wherein said hot plastic working is working selected from the group consisting of hot extruding, hot forging, hot rolling, and hot isostatic pressing.

8. The method for producing a Ti—Fe-based sintered alloy material according to claim 6 , wherein a cooling velocity in said natural cooling is in a range of 3 degrees/second to 20 degrees/second.

Assignees

• Kondoh Katsuyoshi
• Hi Lex Corp

Inventors

• Kondoh Katsuyoshi

Classifications

• B22F3/162 Primary

  Machining, working after consolidation · CPC title

• B22F2201/50

  air · CPC title

• B22F3/24

  After-treatment of workpieces or articles {(B22F3/1146 takes precedence)} · CPC title

• B22F2301/205

  Titanium, zirconium or hafnium · CPC title

• B22F2003/248

  Thermal after-treatment · CPC title