RU2346999C2 - Alloy on titanium base and item made out of this alloy - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: group of inventions refers to titanium alloys. There are suggested alloy and an item made out of this alloy. The alloy contains components at the following ratio, wt %: aluminium 2.0-6.8, vanadium 3.0-6.0, molybdenum 1.0-5.6, chromium 0.2-1.6, zirconium 0.6-2.0, iron 0.1-1.2, copper 0.001-0.4, nitrogen 0.01-0.05, niobium 0.2-2.0, silicon 0.03-0.15, titanium - the rest. The purpose of the invention is to upgrade fracture strength and structural hardness at biaxial tension of alloy. The suggested alloy can be employed at fabricating details of aircraft, aerospace and rocket engineering.

EFFECT: 20% reduction of weight of fabricated details and units.

2 cl, 2 tbl, 1 ex

Description

The invention relates to the creation of titanium alloys intended for the manufacture of cladding, bottoms, cylinders, containers and other details, the material of which works under conditions of biaxial tension used in aviation, space and rocket technology, non-ferrous metallurgy.

Known alloy based on titanium having a chemical composition, wt.%:

aluminum 5.5-6.75 vanadium 3.5-4.5 iron 0.25-0.35 carbon 0.10-0.30 oxygen 0.15-0.25 nitrogen 0.05-0.14 titanium rest

(US Patent No. 5759484)

The alloy can be used for the manufacture of cladding, cylindrical shells and other parts and components of aerospace engineering.

The disadvantages of the alloy are low performance when working in a biaxial stress state.

The disadvantage of the products is the low operational reliability.

Known alloy based on titanium having a chemical composition, wt.%:

aluminum 2.0-6.8 molybdenum 0.5-3.8 vanadium 2.0-9.0 chromium 0.4-1.6 iron 0.2-1.2 zirconium 0.02-0.3 oxygen 0.04-0.14 carbon 0.02-0.09 hydrogen 0.003-0.014 nitrogen 0.008-0.04 silicon 0.04-0.14 titanium rest

(RF patent No. 1131234)

Sheet constructions (such as skin, nose fairings and other components) of aerospace and rocketry are made from a known alloy.

The disadvantages of the alloy and its products are reduced characteristics of structural strength and crack resistance.

The closest analogue taken as a prototype is an alloy based on titanium of the following chemical composition, wt.%:

aluminum 4.3-6.0 molybdenum 4.0-5.6 vanadium 4.0-5.6 chromium 0.5-1.5 iron 0.5-1.5 zirconium 0.03-0.5 oxygen 0.02-0.2 carbon 0.01-0.2 hydrogen 0.003-0.03 nitrogen 0.01-0.05 copper 0.003-0.15 nickel 0.003-0.15 titanium rest

(RF Patent No. 2082802)

Sheet metal parts and components of aerospace and rocket technology are made from the prototype alloy.

The disadvantages of the alloy and its products are reduced structural strength and fracture toughness.

An object of the invention is to increase the structural strength and crack resistance.

The technical problem is achieved by the fact that the proposed alloy based on titanium containing aluminum, vanadium, molybdenum, chromium, zirconium, iron, copper, nitrogen, which additionally contains niobium and silicon, in the following ratio, wt.%:

aluminum 2.0-6.8 vanadium 3.0-6.0 molybdenum 1,0-5,6 chromium 0.2-1.6 zirconium 0.6-2.0 iron 0.1-1.2 copper 0.001-0.4 nitrogen 0.01-0.05 niobium 0.2-2.0 silicon 0.03-0.15 titanium rest

and product made from it

The authors found that an additional introduction to the proposed alloy of niobium and silicon with the stated content and ratio of the remaining claimed components provides an increase in structural strength and crack resistance.

Examples of specific implementation

In a vacuum-arc method, ingots of the proposed alloy and prototype alloy were smelted. The ingots were forged on presses, after which they were hot and then cold rolled and sheets 2.0 mm thick were made. Test sheets were made from sheets.

Table 1 shows the compositions, and table 2 shows the properties of the proposed alloy and prototype alloy.

In the proposed alloy, the biaxial tensile strength (σ _VK ) increased by 20%, the biaxial tensile strength of the notched specimens (σ _VK ⁿ ) increased by 30%, the impact strength of the cracked specimens (CCT) increased by 40%.

Thus, the use of the proposed alloy will reduce the mass of parts and assemblies by 20% by increasing the level of structural strength (σ _VK ) and increase the operational reliability of the structures.

Table 1 No. Chemical composition, wt.% Al V Mo Cr Zr Fe Cu Nb Si N ABOUT FROM N Ni Ti one 2.0 3.0 1,0 0.2 0.6 0.1 0.001 0.2 0,03 0.01 - - - - DOS 2 3.8 4,5 2,8 1,0 1,2 0.7 0.23 0.8 0.10 0,03 - - - - ”-” 3 6.8 6.0 5,6 1,6 2.0 1,2 0.4 2.0 0.15 0.05 - - - - ”-” four 5.3 4.9 4.7 0.9 0.25 0.9 0.08 0.25 - 0.04 0.10 0.12 0.16 0,07 ”-”

table 2 No. σ _vk , MPa σ _vk ⁿ , MPa σ _vk ⁿ / σ _vk KST, MJ / m ² one 1380 1352 0.98 0.35 2 1420 1363 0.96 0.30 3 1410 1367 0.97 0.32 4 prototype 1180 1027 0.87 0.21 σ _VK - structural strength under biaxial tension;
σ _VK ⁿ - structural strength under biaxial tension of the samples with a notch;
σ _vk ⁿ / σ _vk - sensitivity to a notch under biaxial tension;
KST is the specific work of fracture of a specimen with a crack under shock bending.

Claims (2)

1. An alloy based on titanium containing aluminum, vanadium, molybdenum, chromium, zirconium, iron, copper, nitrogen, characterized in that it additionally contains niobium and silicon in the following ratio, wt.%:
aluminum 2.0-6.8 vanadium 3.0-6.0 molybdenum 1,0-5,6 chromium 0.2-1.6 zirconium 0.6-2.0 iron 0.1-1.2 copper 0.001-0.4 nitrogen 0.01-0.05 niobium 0.2-2.0 silicon 0.03-0.15 titanium rest 2. A titanium-based alloy product, characterized in that it is made of an alloy according to claim 1.