The fatigue limit of tungsten wire is not a fixed value, but is affected by many factors, such as the purity, preparation process, grain structure, diameter, use environment (such as temperature, humidity, load type, etc.) and surface treatment of the tungsten wire. Therefore, it is difficult to accurately give the fatigue limit of tungsten wire, which usually needs to be determined through experimental tests.
However, some general rules and influencing factors can be given:
Purity and preparation process: High-purity tungsten wire and optimized preparation process can usually improve its fatigue limit. This is because impurities and defects may become the starting point of fatigue cracks, reducing the fatigue resistance of tungsten wire.
Grain structure: Tungsten wire with fine grain structure often has a higher fatigue limit. This is because the fine grain structure helps reduce the possibility of stress concentration and crack propagation.
Diameter: The diameter of the tungsten wire also affects its fatigue limit. Generally speaking, the stress concentration effect is more significant when the tungsten wire with a smaller diameter is subjected to the same load, which may lead to a lower fatigue limit. However, this is not absolute, because the change in diameter may also affect the heat dissipation and mechanical properties of the tungsten wire.
Use environment: The use environment has a significant effect on the fatigue limit of the tungsten wire. For example, a high temperature environment may cause the tungsten wire material to soften and reduce its fatigue resistance; while humidity and corrosive environments may accelerate the propagation of fatigue cracks.
Surface treatment: Surface treatment of tungsten wire, such as carburizing, quenching, shot peening, etc., can improve the strength and hardness of its surface layer, thereby increasing the fatigue limit. These treatment methods help reduce the generation and propagation of cracks by forming a compressive stress layer or strengthening layer on the surface of the tungsten wire.
Load type: Different types of loads have different effects on the fatigue limit of tungsten wire. For example, alternating loads may cause fatigue cracks in the stress concentration area of tungsten wire; while constant loads mainly affect the creep performance of tungsten wire.
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