Gamma titanium dual property heat treat system and method

Patent metadata

Field	Value
Publication number	US-10006113-B2
Application number	US-201213590446-A
Country	US
Kind code	B2
Filing date	Aug 21, 2012
Priority date	Aug 21, 2012
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A method for forming a part having a dual property microstructure includes the steps of: forming a blank having a narrow top portion and a wide base portion; heating the blank to an elevated temperature; and forming a dual property microstructure in the blank by cooling different portions of the blank at different cooling rates.

First claim

What is claimed is:

1. A method for forming a part having a dual property microstructure, said method comprising the steps of:
forming a blade blank having a triangular shape having a narrow top portion and a wide base portion;
heating said blade blank to an elevated temperature;
forming a dual property microstructure in said blade blank by cooling different portions of said blade blank at different cooling rates;
placing said blade blank on a grate, providing a plurality of cooling fans for flowing cooling air over said blade blank, and placing each of said cooling fans a distance from 1.0 to 3.0 feet from each side of said grate;
aiming a first one of said cooling fans at said narrow top portion of said blade blank and aiming a second one of said cooling fans at said wide base portion of said blade blank;
cooling said narrow top portion at a cooling rate in the range of 5.0 to 6.0 deg. F./sec. and cooling said wide base portion at a cooling rate in the range of 3.5 to 4.0 deg. F./sec, wherein said narrow top portion comprises a fully lamellar microstructure and said wide base comprises a duplex microstructure consisting of a globular gamma phase in a lamellar matrix.

2. The method of claim 1 , further comprising forming said cooled blade blank into said part.

3. The method of claim 1 , wherein said blade blank forming step further comprises forming a bottom which is flat so that blade blank can be stood up.

4. The method of claim 1 , wherein said heating step comprises heating said blade blank in a furnace at a temperature above an alpha transus temperature.

5. The method of claim 1 , further comprising forming said blade blank from a titanium based alloy.

Assignees

• Demichael Thomas
• Das Gopal
• Moulin Michael A
• United Technologies Corp

Inventors

• Demichael Thomas
• Das Gopal
• Moulin Michael A

Classifications

• C21D2221/00

  Treating localised areas of an article · CPC title

• C22C21/00

  Alloys based on aluminium · CPC title

• C22F1/183 Primary

  of titanium or alloys based thereon · CPC title

• C22C14/00

  Alloys based on titanium · CPC title

• C22F1/18

  High-melting or refractory metals or alloys based thereon · CPC title