Under The Influence Of Magnetic Field On Different Cooling Conditions Surfacing Layer Microstructure And Properties

With the rapid development of materials science and industrial technology, the lack ofresources is increasingly becoming a huge problem facing the contemporary era, materialquality and life of the industry has become the focus of attention, the material wear and tearcaused by the production process hazard is very large. According to relevant survey,construction, mining, machinery manufacturing, metallurgy and other industries, as a directresult in the failure of the material wear reached nearly10million tons, coupled withmechanical failure due to wear and parts failure caused more damage for economic output. Inorder to improve the wear resistance of materials and effectively reduce production costs toconserve resources, research on the welding parameters of iron-based wear-resistant alloy isvery necessary. In addition, to improve the mechanical properties of welded joints, the internalgrain structure of the material changes, the longitudinal magnetic field and cooling water tankare introduced in the welding process for researching the effects of the microstructure andproperties of surfacing welding layer and nucleation regularity on different welding conditions.The Fe5alloy powder as raw material, in the process of plasma arc surfacing introducinglongitudinal DC magnetic field, after welding, using of wet sand abrasion tester, opticalmicroscopy, XRD, scanning electron microscopy, hardness tester, and other equipment,influence of surfacing layer hardness, wear resistance and microstructure were detected andanalyzed, resulting in welding materials to meet the requirements.The experimental results show that, the internal grain structure of surfacing layer underthe effect of magnetic field and water significantly affect the strength of weld metal properties,reduce the crystal crack, improve the mechanical properties, get the surfacing layer with highhardness and wear resistance. The influence of external magnetic field welding technology haschanged the shape of arc plasma arc welding, of base metal and weld formation effect. Byelectromagnetic stirring, change the weld pool of liquid metal crystallization process of masstransfer and heat transfer process, improve the hard facing layer organization, reducesegregation, fine grains and improve the performance of surfacing welding layer. And watercooling can accelerate the molten pool solidification, crystal directional solidification in thedirection of heat dissipation. For the Fe5alloy, welding current is160A matching in the optimal parameters, magnetic field current is3A, and the welding surface hardness of HRC63.4, the wear volume is0.0815g.