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The reason why titanium alloy processing is difficult
by：Foxron
2021-09-17
The reasons for the difficulty of titanium alloy processing are as follows:
Gas impurities (oxygen, nitrogen, hydrogen, etc.) have a great influence on the machinability of titanium alloys, because titanium has high chemical activity and is easy to combine with gas impurities. When the temperature exceeds 600 degrees, titanium is oxidized to form an embrittlement layer, the so-called 'structure alpha layer'; it produces hydrogen embrittlement with hydrogen; and forms hard and brittle TiN with nitrogen at high temperatures.
Titanium alloy has low plasticity, which obviously affects its plastic deformation during cutting. The deformation coefficient of titanium alloy is only 1 or even less than 1, while the deformation coefficient of ordinary carbon steel is about 3. During cutting, the chip has a very small contact surface with the rake face, which makes the contact area pressure and local temperature high, and the tool wears quickly
Titanium alloy will produce severe work hardening during processing.
When C>0.2%, titanium alloy will form hard carbides, which will cause abrasive wear to the tool and reduce the machinability.
Expansion information:
Titanium is an important structural metal developed in the 1950s. Titanium alloy has high strength, good corrosion resistance and high heat resistance. From the 1950s to 1960s, the main focus was the development of high-temperature titanium alloys for aero-engines and structural titanium alloys for airframes.
A batch of corrosion-resistant titanium alloys were developed in the 1970s. Since the 1980s, corrosion-resistant titanium alloys and high-strength titanium alloys have been further developed. Titanium alloy is mainly used for the production of aircraft engine compressor components, followed by the structural parts of rockets, missiles and high-speed aircraft.
Gas impurities (oxygen, nitrogen, hydrogen, etc.) have a great influence on the machinability of titanium alloys, because titanium has high chemical activity and is easy to combine with gas impurities. When the temperature exceeds 600 degrees, titanium is oxidized to form an embrittlement layer, the so-called 'structure alpha layer'; it produces hydrogen embrittlement with hydrogen; and forms hard and brittle TiN with nitrogen at high temperatures.
Titanium alloy has low plasticity, which obviously affects its plastic deformation during cutting. The deformation coefficient of titanium alloy is only 1 or even less than 1, while the deformation coefficient of ordinary carbon steel is about 3. During cutting, the chip has a very small contact surface with the rake face, which makes the contact area pressure and local temperature high, and the tool wears quickly
Titanium alloy will produce severe work hardening during processing.
When C>0.2%, titanium alloy will form hard carbides, which will cause abrasive wear to the tool and reduce the machinability.
Expansion information:
Titanium is an important structural metal developed in the 1950s. Titanium alloy has high strength, good corrosion resistance and high heat resistance. From the 1950s to 1960s, the main focus was the development of high-temperature titanium alloys for aero-engines and structural titanium alloys for airframes.
A batch of corrosion-resistant titanium alloys were developed in the 1970s. Since the 1980s, corrosion-resistant titanium alloys and high-strength titanium alloys have been further developed. Titanium alloy is mainly used for the production of aircraft engine compressor components, followed by the structural parts of rockets, missiles and high-speed aircraft.
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