Methods for processing titanium aluminide intermetallic compositions

a technology of titanium aluminide and intermetallic composition, which is applied in the field of titanium aluminide intermetallic composition processing, can solve the problems aluminum to be lost from casting surface, etc., and achieve the effect of additional cost and cycle tim

Inactive Publication Date: 2013-09-26
GENERAL ELECTRIC CO
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Benefits of technology

[0011]A technical effect of the invention is the ability to produce desirable duplex microstructures in TiAl intermetallics that may otherwise be difficult to obtain, particularly if produced by net-shape casting methods such as spin casting and possibly certain other casting techniques. Another technical effect is the ability to take advantage of the energy available for phase equilibration during cool down from a HIP step to assist in a subsequent heat treatment, which has been determined to eliminate the requirement for conventional pre- a

Problems solved by technology

Another technical effect is the ability to take advantage of the energy available for phase equilibration during cool down from a HIP step to assist in a subsequent heat treatment, which has been de

Method used

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  • Methods for processing titanium aluminide intermetallic compositions
  • Methods for processing titanium aluminide intermetallic compositions
  • Methods for processing titanium aluminide intermetallic compositions

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Embodiment Construction

[0017]FIGS. 4 and 5 contain flow charts that represent two related methods by which TiAl intermetallic compositions, including but not limited to the 48-2-2 alloy, can be processed to yield a desirable duplex microstructure, with the additional benefit of avoiding the disadvantages of the prior art process summarized in FIG. 3. In particular, the methods of FIGS. 4 and 5 avoid the pre- and post-HIP vacuum heat treatments that are believed to promote the loss of aluminum in TiAl intermetallic compositions. The invention also takes advantage of the high gas pressures and protective (inert) atmospheres used during HIP, the combination of which is believed to be capable of reducing the loss of aluminum in a TiAl intermetallic composition. Furthermore, each of the methods summarized in FIGS. 4 and 5 provide for interrupted cooling from a HIP step (FIG. 4) or a temperature that is believed to take advantage of the non-equilibrium phase distribution in TiAl intermetallic compositions follo...

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Abstract

Methods of processing compositions containing titanium and aluminum, especially titanium aluminide intermetallic compositions (TiAl intermetallics) based on the TiAl (gamma) intermetallic compound. The methods entail processing steps that include a hot isostatic pressing (HIP) cycle and a heat treatment cycle that can be performed in a single vessel. TiAl intermetallic compositions processed in this manner preferably exhibit a duplex microstructure containing equiaxed and lamellar morphologies.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 614,751, filed Mar. 23, 2012, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]The present invention generally relates to compositions containing titanium and aluminum and the processing thereof. More particularly, this invention relates to methods of processing cast titanium aluminide intermetallic compositions that entail hot isostatic pressing and heat treatment to close porosity and yield a desirable microstructure.[0003]Because weight and high temperature strength are primary considerations in gas turbine engine design, there is a continuing effort to create relatively light weight alloys / compositions that have high strength at elevated temperatures. Titanium-based alloy systems are well known in the art as having mechanical properties that are suitable for relatively high temperature applications. High temperature ca...

Claims

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Application Information

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IPC IPC(8): C22F1/00
CPCC22C14/00C22C1/02C22F1/18C22F1/183
Inventor KELLY, THOMAS JOSEPHBEWLAY, BERNARD PATRICKWEIMER, MICHAEL JAMESWHITACRE, RICHARD KENNETH
Owner GENERAL ELECTRIC CO
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