Due to the strong toughness of the composite material of high manganese and alloy steel, a wear-resistant alloy with strong hardness can be surmounted on the surface, so that the surface strength of the bucket tooth is greatly improved, so as to obtain a more ideal bucket tooth. Because it has strong principles in the process of drought resistance, overlay welding alloys with high hardness and good wear resistance should be selected in the material.
According to relevant studies, the high iron alloy has stronger wear resistance than the high manganese steel material, and the high iron alloy or martensitic cast iron alloy is used in the manufacture of new bucket teeth and the repair of old bucket teeth. When repairing the treatment, the acetylene flame can be cut by the tip of the old bucket tooth, leaving a certain groove, and then using austenitic steel manganese welding rod to make corresponding treatment of the original form, and finally overlay welding treatment on the surface to improve the wear resistance of large excavators in mines.

First, the cutting mechanism
When the bucket tooth reacts with rock (ore) under high impact load, on the one hand, it is in contact with the rock (ore) surface and produces a large impact force, if the yield strength of the bucket tooth material is low, the tip of the bucket tooth produces a certain plastic deformation, which is easy to form a plastic furrow. On the other hand, when the bucket tooth is inserted into the rock (ore), if the hardness of the bucket tooth is lower than the hardness of the rock (ore), the rock (ore) particles are pushed into the surface of the bucket tooth, which will produce long chips in the shape of a curve or spiral, forming a cutting groove, which may be accompanied by micro cutting chips. Chip due to shear action and a large number of deformation, produce a large amount of deformation latent heat, appear close and neatly arranged slip steps, the formation of wrinkles, in addition, its friction with rock (ore) to produce friction heat, deformation latent heat and friction heat combined effect to make the chip temperature rise sharply, dynamic recrystallization, tempering softening, dynamic phase change, etc., change the internal structure of the chip, some also appear local melting phenomenon.
Second, fatigue peeling mechanism
The bucket tooth is inserted into the rock (ore) to reciprocate, and the plastic plough trench formed on the surface is crushed by rock particles on the uplift for many times, which can form a metal multi-flow table, and cracks and brittle cracks will be produced when the stress of the bucket tooth material exceeds the strength limit. The first is cracked perpendicular to the wear direction, and the other is cracked or torn down the wear direction, with smooth grooved stripes on the front side, flatter on the back, and overlapping stripes formed by crushing deformation on the sides. If the rock is angular, it will shear the deformation layer and form debris, which is flat and flake with rough edges. There is also a situation, when the bucket tooth and the rock repeatedly act, the bucket tooth plastic deformation and cause a high work hardening effect, so that the tooth surface of the bucket tooth is brittle, under the strong impact of the rock, the tooth surface will form brittle chips, and its surface has radial cracks of different depths. This brittle cracking characteristic is also strictly a fatigue flaking mechanism.The wear failure mechanism is related to the material and working conditions, mainly including cutting, fatigue peeling and other mechanisms. Generally speaking, the cutting mechanism dominates the wear failure process of the bucket teeth, reaching more than 7O; With the increase of the hardness of the bucket teeth, the fatigue peeling mechanism gradually increased, accounting for 2O~3O; When the hardness of the material reaches the upper limit, the brittleness increases and brittle chipping may occur. For the working conditions dominated by the cutting mechanism, improving the hardness of the bucket tooth material is conducive to improving its wear resistance; For the fatigue peeling mechanism, the material is required to have a good hard and tough fit; High hardness, high fracture toughness, low crack growth rate and high impact fatigue resistance all contribute to improving the wear resistance of materials.