Titanium Alloy Round Bit

Titanium is an important structural metal developed in the 1950s. Titanium alloy is widely used in various fields because of its high strength, good corrosion resistance and high heat resistance. Many countries in the world have recognized the importance of titanium alloy materials, and have successively researched and developed titanium alloy materials, which have been applied in practice.

The first practical titanium alloy is the Ti-6Al-4V alloy developed by the United States in 1954. Because of its good heat resistance, strength, plasticity, toughness, formability, weldability, corrosion resistance and biocompatibility, it has become the trump alloy in the titanium alloy industry. The use of this alloy has accounted for 75% to 85% of all titanium alloys. Many other titanium alloys can be regarded as the modification of Ti-6Al-4V alloy.

Titanium alloy is an alloy based on titanium and added with other elements. Titanium has two kinds of isomorphic crystals: close-packed hexagonal structure below 882 ℃ α Titanium, body-centered cubic β Titanium.

The density of titanium alloy is generally about 4.51g/cm3, which is only 60% of that of steel. Some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength (strength/density) of titanium alloy is far greater than that of other metal structural materials, which can produce parts with high unit strength, good rigidity and light weight. The engine components, framework, skin, fasteners and landing gear of the aircraft are made of titanium alloy.

What are the performance characteristics of titanium alloy for titanium alloy round cutting head?

1. High specific strength: titanium alloy has low density and high strength, so its specific strength（ σ b/ ρ) Greater than ultra-high strength steel.

2. High thermal strength: titanium alloy has good thermal stability, high temperature strength, and can work at 500 ℃ for a long time, while aluminum alloy can only work at 200 ℃. The strength of titanium alloy at 300~500 ℃ is about 10 times higher than that of aluminum alloy.

3. Good corrosion resistance: titanium alloy can work for a long time in humid atmosphere and seawater medium, and its corrosion resistance is far better than stainless steel. It has strong resistance to pitting, acid corrosion and stress corrosion. It has excellent corrosion resistance to alkali, chloride, chlorine organic compounds, nitric acid and sulfuric acid. However, titanium has poor corrosion resistance to reducing oxygen and chromate media.

4. High chemical activity: titanium reacts strongly with O, N, H, CO, CO2, water vapor and nitrogen in the atmosphere. When the carbon content is greater than 0.2%, hard TiC will be formed in titanium alloy. When the temperature is high, the hard surface of TiN will also be formed by the interaction with N. At above 600 ℃, titanium can absorb oxygen to form a hardened layer with higher hardness.

5. With the increase of hydrogen content, the hardening layer will also be formed: the depth of the hard and brittle surface layer produced by titanium absorption of gas can reach 0.1~0.15 mm, and the hardening degree is 20%~30% higher than the base hardness. The chemical affinity of titanium is also large, and it is easy to bond with the friction surface.

6. Low thermal conductivity and low elastic modulus: the thermal conductivity of titanium is very low, 15.24W/m · K, which is 1/4 of nickel, 1/5 of iron and 1/4 of aluminum. The thermal conductivity of various titanium alloys is lower, generally 50% of that of titanium. For example, TC4 к 7.95 W/m · K, TC9 к Is 7.12W/m · K. The elastic modulus E of titanium and titanium alloy is 110 000MPa, about 1/2 of that of ordinary steel, so it has poor rigidity and is easy to deform.

7. Good low-temperature performance: titanium alloy still maintains its mechanical properties at low temperature and ultra-low temperature (- 100~- 253 ℃), and is an important low-temperature structural material.

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