Experimental Research On Laser Engineered Net Shaping Of SS316/Ni20/Fe90 Functional Graded Blade

3D-flow impellor is the key component of aero engines,large compressors and other machineries.With the application of the increase and the application of the harsh environment,the performance of the 3D-flow impellor has a higher demand.The different working condition of the impellor results that in different positions the mechanical properties,corrosion resistance,etc of the blades have different Performance requirements.Traditional manufacturing methods have unable to meet the different performances of impeller blades in different locations.Laser Engineered Net Shaping(LENS)technology is different from the cut processing.It is a layer of stacked manufacturing,not affected by the complexity of parts and can achieve the preparation of functional gradient materials.LENS technology is applied to the manufacture of 3D-flow impellor blades,according to the different positions of different requirements of blades,functional gradient 3D-flow impellor can be prepared.In this paper,suitable gradient transition path is selected through basic experiments for forming SS316/Ni20/Fe90 function gradient thin wall structure.Microstructure analysis and performance evaluation are conducted,ultimately to meet the requirements of the functional gradient 3D-flow impeller blades.The details are as follows:(1)Selecting SS316?Ni20?Fe90 materials to deposit SS316/Ni20 and Ni20/Fe90 composites with different composition ratios gets a good shape of thin-wall structure.Preferred process parameters are chose to deposit SS316/Ni20 and Ni20/Fe90 functional gradient thin-wall structures to verify the feasible of component gradient transition in different component proportions.And the appropriate gradient transition path is selected to form SS316/Ni20/Fe90 functionally gradient thin wall part.(2)The microstructure,phase composition of SS316/Ni20?Ni20/Fe90 composite parts with different compositional proportions are analyzed to reveal the microstructure evolution law and mechanism of defective parts.Micro-structure determines the maco performance,analysis of microstructure lays the foundation for the macro performance.(3)The mechanical properties,corrosion resistance and other properties of parts with different compositions are tested.Combined with microstructure and phase composition,the reason of the changes of theirs mechanical properties and corrosion resistance are analyzed,which can be used to select the gradient path when forming the function gradient blade.(4)Extract the 3D-flow impellor blade model,add support,layer and slice and generate the work code available for the device.According to the structural characteristics of the blade,develop LENS program to apply to existing equipment.Combined with a preferred gradient transition path and the process parameters of different composition,form a functional gradient 3D-flow blade.