Application of thermal processing technology of new wear-resistant electrode on crusher China University of Mining and Technology (221008) Ying Pengzhan Zhejiang Normal University (310027) Wang Yaqing A kind of anti-wear surfacing electrode suitable for high impact conditions, by repeatedly adjusting the electrode coating composition , Found an alloy system that can be applied to the surfacing of the hammer head of the hammer crusher. The metallographic microscopic analysis and X-ray phase analysis of the surfacing layer show that: the structure of the surfacing layer is martensite plus carbide plus residual austenite, and the hardness of the surfacing layer is HRC62-64; high-stress abrasive wear, its The structure of the matrix is ​​martensite + a small amount of residual austenite DC dual-use, etc. At the same time, the alloying agent in the drug skin rapidly transitions to the alloy element in the droplet under the action of arc stirring, and the droplet is rapidly under the action of gravity and surface tension The transition to the workpiece is due to the fusion welding between the surfacing layer and the base metal, which is a metallurgical combination and has strong impact resistance.
The electrode welding current is equivalent to or slightly larger than that of ordinary titanium-calcium structural steel electrodes. The H4mm welding core electrode has a welding current of 140 ~ 160A. When the surfacing current is low, the melting rate of the electrode decreases, carbon and alloy elements are not fully fused into the surfacing layer, but are lost due to the formation of slag, and the alloy carbide content decreases, resulting in a low hardness of the surfacing layer , The wear resistance decreases; when the surfacing current is too large, the molten pool temperature also rises, the carbon and alloy elements burn more, the alloy carbide content decreases, the hardness and wear resistance of the surfacing layer decrease, and the large current It will also make the welded alloy phase photo 40CK surfacing layer and base metal fusion zone surfacing layer and base metal junction will be in a state of mutual fusion and diffusion (such as), so that the surfacing layer and base metal are firmly combined, we use 16 Pound sledge hammer, hammering the surfacing layer test block many times from a 2m high drop, the temperature of the molten pool rises easily, and it is easy to promote the formation of coarse crystals. This should also avoid the phenomenon that the surfacing layer and the base metal fall off.
of. When the surfacing current is 150 people, the carbon and alloy elements can be fully protected under the impact load. The existence of this fused structure is extremely left in the surfacing layer, forming a certain amount of alloy carbide hard phase, surfacing It is beneficial to increase the hardness and wear resistance of the layer, which can ensure the bonding strength of the surfacing and the base metal. Industry 4. The surfacing current of the surfacing alloy is 150A, and the surfacing layer is one layer. The average hardness is HRC63.2, the average microhardness of the substrate is HV839, and the average microhardness of the carbide is HV. The result of the industrial experiment is that on the surface of the 45 steel hammer head, a layer of wear-resistant alloy welding machine with a thickness of about 3mm is AC welding. The surfacing current of the machine is 150A. A total of 3 sets of surfacing hammer heads have undergone on-site industrial experiments. The service life averages 27d, which is 8 times longer than the original service life (the original 3d).
The hammer head of the original crusher is 45 steel, which is an ordinary medium carbon steel. The wear resistance of the strong abrasive particles is very poor. The hammer head is high alloy wear resistant surfacing. Due to the thick surfacing layer, the carbide of high hardness is in the surfacing layer. The skeleton is formed in the structure, which strongly resists the cutting of the abrasive particles and the metallurgical bond between the surfacing layer and 45 steel is firm and not easy to peel off, thereby improving the wear resistance of the hammer head.
The newly developed EDTCrWV-00 surfacing electrode has a simple surfacing process and is suitable for on-site surfacing of the crusher. The structure of the surfacing alloy of the hammerhead of the crusher is martensite + carbonized surfacing layer and the base metal are in a state of miscible diffusion, which is beneficial The anti-strength new wear-resistant surfacing alloy surfacing hammer head has good wear resistance, which is 8 times the service life of the hammer head using 45 steel, which not only reduces the cost of the hammer head consumption, but also improves the work efficiency
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