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Factors affecting the fatigue strength of 45 # steel plate
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The main factors affecting the fatigue strength of 45 # steel plate are as follows:
1、 Characteristics of the material itself
Strength and hardness: Generally speaking, the higher the strength and hardness of a material, the higher its fatigue strength. After quenching and tempering treatment, the hardness of 45 # steel plate is around HRC25-HRC32, with moderate strength. Compared to some high-strength alloy steels, its fatigue strength is relatively low.
Resilience: Good toughness can improve the fatigue resistance of materials. After appropriate heat treatment, 45 # steel plate has certain toughness, but compared with some materials with better toughness, its ability to resist fatigue crack propagation is limited.
Internal organization: The internal organization of materials has a significant impact on fatigue strength. The internal structure of 45 # steel plate is mainly composed of pearlite and ferrite, and the uniformity and purity of the structure will affect the fatigue strength. If there are defects such as inclusions and pores in the material, it will reduce the fatigue strength.
2、 Processing technology
Heat treatment: Different heat treatment methods will affect the fatigue strength of 45 # steel plate. But if the heat treatment process is improper, such as excessive quenching temperature, insufficient tempering, etc., it can lead to residual stress and uneven structure inside the material, reducing fatigue strength.
Surface treatment: Surface treatment of 45 # steel plate, such as shot blasting, rolling, etc., can introduce residual compressive stress on the material surface and improve fatigue strength.
Processing accuracy: The processing accuracy of parts also has an impact on fatigue strength. If the surface roughness of the part is too large and there are sharp edges, it will lead to stress concentration and reduce fatigue strength.
In summary, the fatigue strength of 45 # steel plate is generally average, and reasonable design, processing, and maintenance should be carried out according to specific situations during use to improve its fatigue life. If there is a high requirement for fatigue strength, high-strength alloy steel or other methods to improve fatigue strength can be considered.
