Study On Process And Properties Of Laser Cladding Fe-Based Alloy

Hydraulic pillars play a supporting and protective role in underground mine,but the poor air fluidity,high temperature and humidity,as well as a large n umber of harmful corrosive dust media such as SO2,make the surface of hydraulic pillars vulnerable to damage,oxidative corrosion in the air causes serious damage to the surface of the pillars,resulting in lower life of the pillars in the use process,and increase mining costs of coal mining enterprises.By using advanced modification technology to prepare high hardness,good wear resistance,high temperature and corrosion resistant cladding layer on the surface of the column,the service life of the hydraulic column is prolonged,which has important economic benefits for reducing the cost of coal mining and resource waste.Laser cladding technology is one of the most important technologies for surface modification and strengthening repair of damaged surface in recent years.The problem of short service life of mine hydraulic support column is one of the research contents of many scholars at present.In this paper,the research object is hydraulic column.The main test material is 27 SiMn steel.The Fe-based alloy powder is transported by a wide-spot semiconductor laser cladding system in a lateral coaxial way,and the surface of 27 SiMn steel sample is modified by laser cladding technology.On the basis of orthogonal experiment method,the process parameters were designed.Through the observation,recording and analysis of the surface morphology and internal characteristics of the cladding layer,the ultimate goal of the study was to meet the practical application needs of the optimal process parameters.The optim um single-pass process parameters were found and the lapping process parameters were explored on the basis of optimizing the parameters.The overlap experiment was carried out to optimize the experimental parameters of single pass cladding,and better parameters of overlap cladding layer were screened out.The thickness of overlap cladding layer was more than 1.3,which left a margin for subsequent processing.At the same time,the hardness of overlap cladding layer was more than three times higher than that of base metal,and the average value was more than 630 HV.The friction coefficient of overlapping cladding layer is about 0.4,the friction coefficient of cladding layer is reduced by40% and the wear rate is reduced by 58% compared with the base material.The corrosivity ofoverlapped cladding layer was evaluated by the national standard.The corrosion grade was 10,which reached the national standard of hydraulic column.Compared with the surface quality of 27 SiMn steel,the properties of cladding layer are improved greatly.In summary,laser cladding of Fe-based alloy can improve the surface of hydraulic support pillars,which provides a theoretical support for the study of the parameters and properties of the surface modification of the pillars.