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Lamellar-structure titanium-aluminum based alloy having a beta-gamma phase

Inactive Publication Date: 2015-11-12
KOREA INST OF MASCH & MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The present invention provides a lamellar titanium-aluminum (TiAl) alloy with improved mechanical properties, including grain refinement, creep resistance, high-temperature oxidation resistance, and ductility, while reduced manufacturing costs. This is achieved by adding tungsten (W) and chromium (Cr) to stabilize the beta phase, in place of molybdenum (Mo) and vanadium (Vanadium is expensive. Additionally, a small amount of carbon (C) and silicon (Si) can be added for grain refinement and to suppress production of a deposit. Furthermore, niobium (Nb) can be added for high-temperature oxidation resistance and ductility.

Problems solved by technology

The titanium-aluminum (TiAl) lamellar structure has been known as providing properties that are useful for the practical use of titanium-aluminum (TiAl) as a light high-temperature material, because it has high fracture toughness, fatigue strength, and creep strength, but its insufficient ductility at a room temperature has been known as the largest obstacle in use as a casting material.
The rough grains also reduce the ductility.

Method used

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Embodiment Construction

[0031]A lamellar titanium-aluminum (TiAl) alloy having a beta-gamma phase according to the present invention is described hereafter with reference to FIGS. 1 and 2.

[0032]The terms and words used in the present specification and claims should not be interpreted as being limited to typical meanings or dictionary definitions, but should be interpreted as having meanings and concepts relevant to the technical scope of the present invention based on the rule according to which an inventor can appropriately define the concept of the term to describe most appropriately the best method he or she knows for carrying out the invention.

[0033]Therefore, the configurations described in the embodiments and drawings of the present invention are merely most preferable embodiments but do not represent all of the technical spirit of the present invention. Thus, the present invention should be construed as including all the changes, equivalents, and substitutions included in the spirit and scope of the...

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Abstract

A lamellar titanium-aluminium (TiAl) alloy having a beta-gamma phase according to the present invention contains aluminum (Al) of 40˜46 at %, niobium (Nb) of 3˜6 at %, a creep resistance enhancer of 0.2˜0.4 at %, a softening resistance enhancer of 2 at %, and the balance of titanium (Ti) and is manufactured by vacuum arc melting.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a lamellar titanium-aluminum (TiAl) based alloy having a beta-gamma phase, and more particularly, to a lamellar titanium-aluminum (TiAl) alloy having a beta-gamma phase of which the effect of stabilizing a beta phase is improved and the manufacturing cost is reduced, by adding tungsten (W) and chromium (Cr) that are not expensive instead of molybdenum (Mo) and vanadium (V) that are usually added to stabilize a beta phase.[0003]The present invention relates to a lamellar titanium-aluminum (TiAl) alloy having a beta-gamma phase of which mechanical properties are improved by adding a small amount of carbon (C) and silicon (Si) that are effective in grain refinement and creep resistance to suppress production of a deposit and of which high-temperature oxidation resistance and ductility are improved by adding niobium (Nb).[0004]2. Description of the Related Art[0005]A titanium-aluminum (TiAl)...

Claims

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Application Information

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IPC IPC(8): C22C14/00
CPCC22C14/00C22C1/02
Inventor KIM, SEONG WOONGNA, YOUNG SANGKIM, SEUNG EONYEOM, JONG TAEK
Owner KOREA INST OF MASCH & MATERIALS
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