Method of preparing a metal alloy part
a metal alloy and part technology, applied in the field of metal alloy part preparation, can solve the problems of non-uniform mechanical strength of parts belonging to a single batch of parts obtained from the same alloy, and achieve the effect of improving the quality of parts produced
Inactive Publication Date: 2016-01-28
SAFRAN LANDING SYSTEMS
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Benefits of technology
The invention provides a method for converting an alloy made up of a majority of titanium. The aim is to improve the quality of parts made from this alloy that has been converted using the method.
Problems solved by technology
It has been found that parts belonging to a single batch of parts obtained from the same alloy present non-uniform mechanical strength.
Method used
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Embodiment Construction
[0053]The purpose of the method of the invention is to convert a titanium alloy that is initially in the form of an ingot, the conversion method serving to make the microstructure characteristics of the alloy more uniform.
[0054]The alloy converted by the conversion method of the invention is in the form of one or more billets. The alloy as obtained in this way in the form of billets is then successively:[0055]forged to generate particular shapes needed for the final part that is preferably a large part of landing gear, such as a rod or a truck; then[0056]machined in order to remove some of the alloy present on the forging; then optionally[0057]subjected to solution heat treatment and quenched in water or air; and then[0058]thermally aged in order to be hardened, the alloy as aged in this way being a quasi-β alloy containing nodules of primary alpha phase alloy between the β grains, together with a precipitate of secondary alpha inside the β grains.
[0059]Although the invention relate...
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Abstract
A method of converting an alloy comprising a majority of titanium, the method comprising:a step of fabricating an ingot (1);steps of a first type (A, B, C) of plastically deforming the alloy at a temperature higher than the β transus temperature Tβ;steps of a second type (A′, B′) of plastically deforming the alloy at a temperature lower than the β transus temperature Tβ.These step of the first and second types (A, A′, B, B′, C) are performed in the following sequence:a first step of the first type (A) at a first temperature T1; a first step of the second type (A′);a second step of the first type (B) at a second temperature T2 lower than T1; a second step of the second type (B′); anda third step of the first type (C) at a third temperature T3 lower than T2.
Description
[0001]The invention relates to a method of converting an alloy containing a majority of titanium.BACKGROUND OF THE INVENTION[0002]More particularly, the invention relates to a method of converting an alloy that comprises, in percentage by weight of alloy, a majority of titanium, the alloy presenting a β transus temperature beyond which a transition is observed from a phase alloy structures to β phase alloy structures, the method comprising:[0003]a step of fabricating an ingot made of said alloy;[0004]at least first, second, and third steps of a first type consisting in plastically deforming the alloy from said ingot while it is at a current temperature strictly higher than the β transus temperature; and[0005]at least first and second steps of a second type consisting in plastically deforming the alloy from said ingot while it is at a current temperature strictly lower than the β transus temperature.[0006]In percentage by weight of alloy, titanium alloys contain a majority of titaniu...
Claims
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IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183
Inventor SONIAK, FRANCIS
Owner SAFRAN LANDING SYSTEMS