الوصف

The shovel teeth are a class II wear-resistant steel, manganese steel...and the bucket bottom is a class I steel.
The actual working conditions of shovel teeth are very harsh, and they are not only subjected to wear and tear but also to certain impact loads when they come into contact with the material. Therefore, it is of great practical significance to study new excavator tooth materials, improve the service life of tooth parts under working conditions, and reduce the economic losses caused by wear. By heat treatment of the experimental steel with different compositions and related testing and theoretical analysis, the best composition ratio and optimal heat treatment process were found. The shovel tooth parts produced by the experimental steel obtained good comprehensive mechanical properties, i.e. the tip part has excellent wear resistance and certain toughness, while the shank part has high toughness and certain wear resistance. The research results show that with the increase of carbon content, the hardness of the experimental steel gradually increases, while the impact toughness shows a significant decreasing trend; with the increase of manganese content, both hardness and impact toughness show a trend of first increase and then decrease. The optimum chemical composition ratio (wt%) of the experimental steel is C:0.*4, Si:1.8, Mn:1.5, Cr:1.0. By using mechanical properties experiments and metallurgical microscopy and scanning electron microscopy, energy spectrometry and transmission electron microscopy, the mechanical properties, microstructure and phase composition of the material were analyzed, and the optimum heat treatment process of the experimental steel was determined, that is, the experimental steel material was normalized at After normalizing at **0℃, the hardness value can reach HRC*0~HRC*8, impact toughness value ak≥*0J/cm2; after tempering at **0℃×1h***0℃×*0min***0℃×2h, the hardness value can reach HRC*8~HRC*4, impact toughness value can reach *5~*0J/cm2; simulating the actual working condition for wear experiment, the material's The wear volume of the material is significantly lower than the wear volume of the shovel tooth material in service in the factory. After the heat treatment of the shovel tooth parts produced with this experimental steel, the hardness change from the tip to the shank shows a good transition, which ensures the optimization of the mechanical properties of the material in the tip and shank parts. The hardness of the tooth tip is HRC*8~HRC*4, the hardness of the middle of the shovel tooth is HRC*0~HRC*5, and the hardness of the shank is HRC*0~HRC*8. The shovel tooth is tested on the machine.