Study On Wear-resisting Layer Deposited With High-Frequency Induction Heating On The Surface Of Mild Steel

The working environment of vibrating sieve is so formidable that its wearing breakage is very heavy and the working life of the sieve plate is shortened. Not only the productivity is influenced but also the economical efficiency is reduced. When deposited a wear-resistant layer on the surface of mild steel sieve plate, the high plasticity and ductility of mild steel can be preserved as well as the hardness and wear-resistance of the deposit layer can be improved greatly which can satisfy the wear-resisting request, prolong the working life of the sieve plate, improve the productivity, and enhance the economical efficiency because of materials saving.The main problems in high-frequency induction deposit are that the processing properties such as the surface quality, detachability, thickness of the layer, combination of the layer with the base metal is awful as well as the microstructure of the layer which containing many disfigurements like slag inclusion and blow hole is not perfect and the properties as hardness and wear-resistance can't reach the working request.Aimed at the above questions, the processing properties as well as the microstructure and properties of the high-frequency induction deposit layer were studied. The results of the fluxes orthogonal experiments showed that: (1) Adding about 3% boric anhydride,8~ 12% welding flux 431 and 1% fluorites into the alloy powder could remove the oxide of powder material surface, depress the melting point of the powder and improve the detachability efficiently, facilitate the combination of the deposited layer and the mild steel, eliminate the slag inclusion and blow hole, and finally got a wear-resistant layer with expectant thickness which could get to 2.5mm as well as compact and fine microstructure and strengthening phases. (2) The eutectics increased along with the of fluxes, the hardness and wear-resistance elevated incessantly. The improvement increased obviously when boric anhydride didn't exceeded 3% and welding flux 431 didn't exceeded 8— 12%,...