RU2600787C1 - Copper-nickel alloy and article made therefrom - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, specifically to nickel-based alloys intended for production of parts and assemblies, having high wear and corrosion resistance, antifriction properties, used in aircraft industry. Nickel-based alloy contains, in wt%: copper 29.5-32.5; iron 1.6-2.9; silicon 4.7-5.1; manganese 0.5-1.8; molybdenum 0.1-0.3; tungsten 0.8-1.2; titanium 0.1-0.3; carbon 0.05-0.35; magnesium 0.03-0.30; dysprosium 0.035; calcium 0.02; cerium 0.07; nickel - balance. Alloy is characterised by high values of ductility, ultimate strength and hardness.

EFFECT: longer service life and higher reliability of articles made from alloy.

2 cl, 2 tbl, 3 ex

Description

The invention relates to the field of metallurgy, in particular to nickel-based alloys intended for the manufacture of parts and assemblies with a high level of wear and corrosion resistance, antifriction properties used in the aviation industry.

The reliability level of gas turbine engine equipment is largely determined by the use of modern electronic control systems, monitoring and diagnostics. At the same time, materials for especially critical parts, which include spool pairs, have a great influence on the operability of this system. The reliability of not only the fuel equipment, but also the gas turbine engine as a whole depends on their uninterrupted operation. Increasing the life of spool parts is currently one of the most urgent tasks, especially in connection with the expanded use of fuels with a high sulfur content, because the resource of hydraulic power units is determined by the resource of spool parts used in them. Traditional fumes, such as bronze-steel and steel-steel, do not withstand the harsh operating conditions of the use of new fuels due to insufficient strength and wear resistance (for bronzes) or because of the tendency to set when exceeding certain operating conditions.

A further increase in the resource characteristics of the spool parts is possible due to the development of a new alloy that would combine high corrosion resistance with higher strength characteristics and hardness, which will increase the wear resistance of the copper-nickel composition.

Known alloy (CN 1405343, publ. March 26, 2003) having the following chemical composition in wt.%:

Copper 28.0-33.0 Iron 1.0-2.0 Silicon 0.1-1.0 Manganese 1.0-2.0 Titanium 0.40-0.80 Aluminum 2.0-4.0 Carbon 0.05-0.30 Nickel rest

The disadvantages of this alloy are low wear resistance, since the main hardening phase is not silicide, which has an extremely high microhardness, but a γ′-phase of Ni ₃ (Al, Ti) type, which has a lower microhardness, typical of heat-resistant alloys. Products have a tendency to set when exceeding certain operating conditions. The working shafts of fuel pumps, tools and instruments for oil wells, and surgical instruments are made from this alloy.

The prior art (RF patent No. 2278178, IPC C22C 19/03, publ. 06/20/2006) known alloy based on Nickel, which is used in the details of friction units of automatic control systems of gas turbine engines of the following composition in wt.%:

Copper 30.0-33.0 Silicon 2.5-3.2 Aluminum 2.5-3.2 Titanium 0.5-0.1 Magnesium 0.03-0.30 Lanthanum 0.07-0.25 Scandium 0.01-0.03 Nickel rest

The disadvantage of this alloy and products from it is its insufficiently high mechanical properties.

The closest analogue taken as a prototype (RF patent No. 2191843, IPC С22С 19/03, publ. 19.01.2001), is an alloy of the following composition, in wt.%:

Copper 30.0-32.0 Iron 1.5-2.8 Silicon 3.9-4.3 Manganese 0.5-1.5 Titanium 0.05-0.25 Carbon 0.05-0.30 Magnesium 0.03-0.20 Niobium 0.05-0.25 Nickel rest

The disadvantages of this alloy are the low tensile strength σ _in = 1200 MPa, as well as the low hardness value HRC of 38-40 units, which negatively affects the work, since under severe operating conditions, as well as due to insufficient strength and wear resistance, the alloy has a tendency to set.

The technical task of the present invention is to develop the composition of a new deformable high-strength wear-resistant and corrosion-resistant copper-nickel alloy for parts of friction units of automatic control systems and experimental technologies for its production.

The technical result of the invention is the development of an alloy based on Nickel and products made from it, possessing, in comparison with the prototype, higher mechanical properties, such as impact strength, tensile strength and hardness.

To achieve the technical result, we propose a nickel-based alloy containing copper, iron, silicon, manganese, titanium, magnesium, carbon, additionally containing molybdenum, tungsten, dysprosium, calcium and cerium in the following ratio of components in wt.%:

Copper 29.5-32.5 Iron 1.6-2.9 Silicon 4.7-5.1 Manganese 0.5-1.8 Molybdenum 0.1-0.3 Tungsten 0.8-1.2 Titanium 0.1-0.3 Carbon 0.05-0.35 Magnesium 0.03-0.30 Dysprosium 0,035 Calcium 0.02 Cerium 0,07 Nickel rest,

and an article made of this alloy.

The introduction of an additional component in the alloy - tungsten - in the stated ratio with other components can increase the toughness, and tungsten also compensates for the decrease in toughness with an increase in silicon content up to 5.1%.

The introduction of titanium and molybdenum in the indicated amounts is due to the need for complex modification of the structure, which contributes to the refinement of micrograins due to the formation of additional slip planes during deformation and thereby increases the hardness of the alloy. To ensure low levels of gas impurities, alkaline earth elements magnesium and calcium are introduced in the amount of 0.07 and 0.02%, respectively, and cerium and dysprosium are 0.07 and 0.035% as deoxidants.

The introduction of carbon, in addition to a partial deoxidizing effect, provides the formation of carbides, which increase the hardness of the alloy.

Examples of carrying out the invention.

The alloy is smelted in vacuum induction furnaces using both pure charge materials and domestic waste using standard equipment using accepted technology. Metal spillage is carried out mainly in metal forms (copper, cast-iron molds). Then the alloy ingots are subjected to deformation in the press on bars, forgings, washers. The resulting cast billets are deformed from 045-90 to bars 015-50 mm. The rods are subjected to heat treatment, consisting of hardening and aging.

The compositions and properties of the proposed alloy and prototype alloy are shown in tables 1 and 2.

From table 2 it is seen that the claimed invention provides an increase in the mechanical properties of the proposed alloy compared with the prototype alloy: tensile strength by 10%, hardness by 15-10%.

Using the proposed alloy will improve the resource and reliability of aircraft products.

Claims (2)

1. Nickel-based alloy containing copper, iron, silicon, manganese, titanium, magnesium and carbon, characterized in that it further comprises molybdenum, tungsten, dysprosium, calcium and cerium in the following ratio of components in wt. %
Copper 29.5-32.5 Iron 1.6-2.9 Silicon 4.7-5.1 Manganese 0.5-1.8 Molybdenum 0.1-0.3 Tungsten 0.8-1.2 Titanium 0.1-0.3 Carbon 0.05-0.35 Magnesium 0.03-0.30 Dysprosium 0,035 Calcium 0.02 Cerium 0,07 Nickel rest 2. A nickel-based alloy product, characterized in that it is made of an alloy according to claim 1.