Two Novel Wear-resistant Surface Welding Materials And The Structure Property Of Deposited Metal

Machinery accessory is mostly made of metal material.Due to the relative motion between machinery parts or between machinery parts and subject materials,the abrasion will take place.With the process of modern industry,working condition of machinery accessory is so extraordinarily demanding that lots of machinery accessory are discarded because of abrasion.As it is simple in technique and economic in equipment,facing welding is widely used in preparation of wear-resistant alloy layers on steel substrate to improve the lifespan of machinery accessory.The conventional surface welding materials,such as electrode and flux-cored wire, are commonly made from alloy powder.However,the production technology of alloy powder is complex,which increases cost of surface welding in turn.Furthermore,the production efficiency of traditional manual labour surface welding is relatively low.In concern of these problems,this paper designs two novel wear-resistant surface welding materials:core alloy powder agglomates and surface welding alloy beads.The using of Core alloy powder agglomates improves production efficiency of traditional manual labour surface welding,and,the using of weld alloy beads reduces the cost of production as we can recycle the home-grown scrap steel..Core alloy powder agglomates is maken up of core welding-wire in the center and coating in the outside.The cross section of core alloy powder agglomates can be designed to specific geometry form,such as triangle,hemicycle,echelon and so on, which solves the problem of high melting point and the difficulty in depositing,while too many alloy elements coexist in core alloy powder agglomates.Pressed by hydraulic electrode extrusion press,core alloy powder agglomates with H08A core welding-wire ensure quality of the extrusion.According to the wear wording condition of mechanical loader,this paper designs core alloy powder agglomates of Cr-Mo-V.The deposited metal of Cr-Mo-V alloy powder agglomates are studied using SEM,X-ray,electron probe etc.The results demonstrate that the majority of deposited metal of Cr-Mo-V mostly is martensite and alloy element,such as Cr,Mo presents in the substrate in the form of solid solution.The relationship between the fraction of Cr,C,and Mo in deposited metal,the hardness of deposited metal and wear-resistance are analyzed through grinding abrasion testing.Then,the project test of application of Cr-Mo-V alloy powder agglomates on work device of mechanical loader are carried out based on the research results.With the improving of equip level of ferrous metallurgy,the production of high purity steels increases rapidly.While the production high purity steels,the amount of coach and plate edges take up to the 4%～5%of gross steel production due to need of length fix,and these steels are seemed as scrap steel to melt down as scrap steel, which will experience the technological process of steel-making,and steel-rolling once again,causing the waste of energy source and the pollution of environment. However the purity of such scrap steel meets the standard of raw material of welding material,and alloy elements in it can be used by welding metallurgy efficiently.This paper makes use of the home-grown scrap steel of steel enterprise,melting the scrap steel into molten steel with medium frequency induction furnace,adding proper amount of alloy elements on the basis of application condition of surface welding material,and manufacturing the molten steel into weld alloy beads by centrifugal atomization.Alloy beads can be deposited on the surface of steel substrate by electric arc,obtaining clad plate with high wear-resistance alloy layer.The shape of the particle is globular shape or spheroidicity,and the dramatic of the particle is 0.1mm～5mm.This paper designs the chromium rich Fe-Cr-C cast-ion wear-resistant surface welding alloy beads.The structure property of Fe-Cr-C alloy particle high chromium cast-ion deposited metal of hypoeutectic,eutectic,hypereutectic are studied using SEM,X-ray,and so on.Through the test of grinding abrasion,the wear-resistant ability of deposited metal are measured,and the relationship between carbon equivalent in deposited metal,hardness of deposited metal,carbide quantity of hypereutectic high chromium cast-ion deposited metal and wear-resistant ability are analyzed.Wear resistant parts of basket of mechanical loader are fabricated by wear resistant clad plate of Fe-Cr-C alloy particle and tested in Taian battlefield.The results show that the wear resistant cladding greatly improves the abravability of basket of mechanical loader.