Titanium Alloys

These more professional terms may not be understood by everyone in ordinary times, or they may not be interested or have the time to understand them.

Today I will introduce some professional knowledge about titanium alloy.

 Capability:

Titanium is a new type of metal. The performance of titanium is related to the content of impurities such as carbon, nitrogen, hydrogen, and oxygen.

The purity of titanium iodide does not exceed 0.1%, but its strength is low and its plasticity is high. The properties of 99.5% industrial pure titanium are: density ρ = 4.5g / cubic centimeter, melting point 1725 ℃, thermal conductivity λ = 15.24W / (mK), tensile strength σb = 539MPa, elongation δ = 25%, cross section Shrinkage ψ = 25%, elastic modulus E = 1.078 × 105MPa, hardness HB195.

High intensity:

The density of titanium alloys is generally about 4.51g / cubic centimeter, which is only 60% of steel. The density of pure titanium is close to that of ordinary steel.

Some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength (strength / density) of titanium alloy is much greater than other metal structural materials.

See Table 7-1, which can produce parts with high unit strength, good rigidity and light weight. Titanium alloys are used for aircraft engine components, skeletons, skins, fasteners, and landing gear.

High thermal strength:

The use temperature is several hundred degrees higher than that of aluminum alloys. It can still maintain the required strength at medium temperature.

It can work for a long time at a temperature of 450 to 500 ℃. These two types of titanium alloys are still very high in the range of 150 ℃ to 500 ℃. Specific strength, while the specific strength of aluminum alloy at 150 ℃ significantly decreased. The working temperature of titanium alloy can reach 500 ℃, aluminum alloys is below 200 ℃.

Good corrosion resistance:

Titanium alloys work in humid atmosphere and seawater media, and their corrosion resistance is far superior to stainless steel; they are particularly resistant to pitting, acid corrosion, and stress corrosion; organic materials such as alkali, chloride, chlorine, nitric acid, and sulfuric acid Etc. have excellent corrosion resistance. But titanium has poor corrosion resistance to media with reducing oxygen and chromium salts.

Good low temperature performance

Titanium alloy can still maintain its mechanical properties under low temperature and ultra-low temperature. Titanium alloys with good low temperature performance and extremely low interstitial elements, such as TA7, can maintain a certain plasticity at -253 ℃. Therefore, titanium alloy is also an important low-temperature structural material.

Great chemical activity:

Titanium has a large chemical activity and produces strong chemical reactions with O, N, H, CO, CO2, water vapor, ammonia gas, etc. in the atmosphere. When the carbon content is greater than 0.2%, hard TiC will be formed in the titanium alloy;

when the temperature is high, the TiN hard surface layer will be formed when it interacts with N; above 600 ℃, titanium absorbs oxygen to form a hardened layer with high hardness ;

Increased hydrogen content will also form a brittle layer. The depth of the hard and brittle surface produced by absorbing gas can reach 0.1 ~ 0.15 mm, and the degree of hardening is 20% ~ 30%. Titanium also has a large chemical affinity, and is prone to adhere to friction surfaces.

 Use:

Titanium alloy has high strength and low density, good mechanical properties, good toughness and corrosion resistance. In addition, titanium alloys have poor process performance and are difficult to cut. In hot working, it is very easy to absorb impurities such as hydrogen, oxynitride and carbon. There is also poor abrasion resistance and complicated production process.

The industrial production of titanium began in 1948. The need for the development of the aviation industry has enabled the titanium industry to grow at an average annual growth rate of about 8%.

The annual output of titanium alloy processed materials in the world has reached more than 40,000 tons, and there are nearly 30 types of titanium alloys. The most widely used titanium alloys are Ti-6Al-4V (TC4), Ti-5Al-2.5Sn (TA7) and industrial pure titanium (TA1, TA2 and TA3).

Titanium alloy is mainly used to make aircraft engine compressor components, followed by rocket, missile and high-speed aircraft structural parts.

In the mid-1960s, titanium and its alloys have been used in general industry, for making electrodes in the electrolysis industry, condensers in power plants, heaters for petroleum refining and seawater desalination, and environmental pollution control devices.

Titanium and its alloys have become a corrosion-resistant structural material. It is also used to produce hydrogen storage materials and shape memory alloys.

However, although the use of titanium is relatively extensive, it still has some disadvantages to a certain extent. Let’s talk about what are the disadvantages of titanium.

Titanium alloy

 Disadvantages:

The main limitation of titanium and titanium alloys is their poor chemical reactivity with other materials at high temperatures.

This property forces the titanium alloy to be different from conventional refining, melting and casting techniques, and even often causes damage to the mold; as a result, the price of the titanium alloy becomes very expensive. Therefore, they are mostly used in aircraft structures, aircraft, and high-tech industries such as petroleum and chemical industries.

However, due to the development of space technology and the improvement of people’s quality of life, titanium alloys are gradually used to make people’s livelihoods and benefit people’s lives.

However, the prices of these products are still high, and they are mostly high-priced products. The biggest fatal injury that cannot be carried forward.

 

Ok, the above is a brief introduction to the titanium alloy, you should also learn some knowledge from it, if you need titanium alloy products, please feel free to buy it!

 

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Eternal Bliss Alloy Casting & Forging Co, Ltd.

Technical Dept.

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