The fracture morphology of tungsten wire can indeed show brittle fracture. Brittle fracture is a major way of tungsten wire fracture, and its characteristics include rapid crack expansion, low energy consumption, no obvious plastic deformation before fracture, and sudden fracture. The following is a detailed analysis of tungsten wire brittle fracture:
- Characteristics of brittle fracture
Rapid crack expansion: During the brittle fracture process, once the crack is formed, it will expand rapidly, causing the tungsten wire to break quickly.
Low energy consumption: Compared with ductile fracture, brittle fracture requires less energy consumption, so the fracture process is faster.
No obvious plastic deformation: Before brittle fracture, tungsten wire usually does not undergo obvious plastic deformation, which makes the fracture more sudden and unpredictable.
Sudden fracture: Since there are no obvious signs before brittle fracture, the fracture often occurs suddenly, which brings safety hazards to use.
- Causes of brittle fracture of tungsten wire
Internal defects: Inclusions, pores and other defects that may exist inside the tungsten wire are easy to become the starting point of cracks when subjected to external forces, thus causing brittle fracture.
Surface defects: Scratches, cracks and other defects on the surface of the tungsten wire will also reduce its fracture resistance and increase the risk of brittle fracture.
Stress concentration: During the use of tungsten wire, if it is subjected to uneven stress distribution, such as bending, compression, etc., it is easy to cause stress concentration, thereby causing brittle fracture.
Temperature influence: As the temperature decreases, the toughness of the tungsten wire will decrease and the brittleness will increase, so it is more likely to cause brittle fracture.
- Fracture forms of brittle fracture of tungsten wire
The brittle fracture forms of tungsten wire mainly include transverse fracture and longitudinal fracture. Among them, longitudinal fracture can be divided into two forms: longitudinal splitting and longitudinal tearing. These fracture forms usually leave obvious features on the fracture of the tungsten wire, such as tearing bands, peeling areas, etc.
- Measures to prevent brittle fracture of tungsten wire
Improve the purity of tungsten wire: By improving the purity of tungsten wire, the number of internal defects and inclusions can be reduced, thereby improving its fracture resistance.
Optimize the preparation process: By optimizing the preparation process of tungsten wire, such as using more advanced wire drawing technology, heat treatment technology, etc., its microstructure and performance can be improved, and its toughness can be improved.
Strengthen surface treatment: Polishing, cleaning and other treatments on the surface of tungsten wire can remove surface defects and contaminants and improve its fracture resistance.
Reasonably design the use conditions: When using tungsten wire, its use conditions should be reasonably designed, such as avoiding excessive stress concentration, controlling the use temperature, etc., to reduce the risk of brittle fracture.
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