Titanium-Based Alloy

Abstract

The titanium-based alloy consists of aluminum, vanadium, molybdenum, iron, and oxygen in the following weight percent ratio: aluminum 3.5-4.4, vanadium 2.0-4.0, molybdenum 0.1-0.8, iron maximum 0.4, oxygen maximum 0.25, the balance titanium. The technical objective is to provide a versatile alloy to be used for making large forgings and die forgings, rolled sheet products and foil having sufficient strength, ductility and structure.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to the field of metallurgy and particularly to the field of developing state-of-the-art titanium alloys used for making high-strength and high-workability articles including large articles, i.e., alloys of high versatility.[0003]Titanium alloys are widely used as aerospace materials, e.g., in air-planes and rockets, since the alloys are mechanically tough and are comparatively light.[0004]2. Background Information[0005]The most widely used titanium alloy is Ti6Al4V (B. A. Kalachyov, I. S. Polkin and V. D. Talalayev. Titanium Alloys of Different Countries. Reference Book. Moscow: VILS, 2000, p. 58-59-[1]). This alloy was developed in the USA during the 1950s. It is characterized by medium strength of 850 up to 1000 MPa and high workability. It is a good material to work by forming: forging, die forging, and extruding. It is widely used in aeronautical and aerospace engineering, shipbuilding, the aut...

AI Technical Summary

Benefits of technology

The invention provides a versatile titanium alloy that can be made into a wide variety of products with minimal manufacturing costs. The alloy has a combination of high strength and ductility achieved through targeted selection and experimental evaluation of the alloying ranges. The content of α-stabilizers and β-stabilizers in the alloy is determined so as to meet the objective. The alloy contains aluminum, vanadium, molybdenum, iron, and oxygen in the following weight percent ratio: aluminum 3.5-4.4 vanadium 2.0-4.0 molybdenum 0.1-0.8 iron 0.4 max oxidation 0.25 titanium balance. The combination of high strength and ductility in the alloy is achieved through targeted selection and experimental evaluation of the alloying ranges. The alloy has sufficient strength to meet the objective and can be used in large forgings, die forgings, and foil products.

Problems solved by technology

The disadvantage of Ti6Al4V is its insufficient versatility.

It is difficult to make rolled sheet products, foil, and tubes thereof since the alloy possesses relatively high resistance to deformation, which, at deformation temperatures below 800° C., leads to the generation of defects such as cracks and shortens the life of working tools, or necessitates costly tools.

The disadvantage of this alloy also is its low versatility since it requires stress relieving in making large structural parts thereof.

The disadvantage of this alloy is that it is rich in Fe and Mo and, therefore, is prone to segregation.