| Laser beam manufacturing technology is a kind of 3D printing and manufacturin-g technology,and it is a new type of automatic simulation of the whole structure manufacturing technology in recent years.Laser beam manufacturing technology based on the combination of fast plastic theory with the modern model design software,the substrate to achieve rapid multi-layer melt stacking process,and finally realize the product forming.The processed products with physical or chemical performance is good,can be freely manipulated shape,good adaptability,compared with the traditional processing technology,laser additive manufacturing technology has unique advantages for the manufacture of special shape or performance of parts.Has been widely used in aerospace,energy,high-end automobile manufacturing,precision instruments and other fields.Nickel based alloy parts using the traditional method of molding tool wear,its processing equipment is serious,need frequent replacement,and waste material produced in the process,the cost is very high,which is currently the main reason for the high price of parts of nickel base alloy.The process of producing nickel based alloy parts by laser beam manufacturing technology can effectively improve the above problems,which is a good solution to the current high cost of nickel based alloys.This paper introduces the cladding forming process of multilayer nickel base alloys,and make a comprehensive analysis of the multilayer alumina material manufactured by strengthening the organization and properties of nickel base alloys,and provides a solution for the oxidation of molding process often appear in the experiment in(using argon gas).Through the research on the experimental results of the analysis showthat the experimental parameters can be adjusted for all the main parameters of the deposition rate effects are:(1)the selected power P(900w~2300w);(2)focal shift Z(400mm);(3)the rate of V cladding powder feeding in the process of(5~40g/min).All parameters in the experiment are the amount of change and Optimization in the range indicated in the scientific measurement of the increasing material manufacturing pattern results: after forming sedimentary layer height in the range of 2.2 mm~ 8.2mm(+ 0.05mm).Through the microscopic scanning analysis of the sample,the number of pores can be seen,and the crack is very small and the uniformity of the microstructure(98.6% density)is good.The main performance parameters are:(1)the average tensile strength of 878.51 MPa is 1.5 times of the ordinary nickel base alloy;(2)the average yield reached 21%,much higher than 10% of the common casting parts.This shows that alumina reinforced nickel based alloy method is a kind of nickel based alloys can be part of the performance of the method,whether in the operability or in terms of cost than the ordinary heat treatment method to better.The relationship between the microstructure and the properties of the alumina reinforced nickel based alloy samples was studied and analyzed in the experiment.The results show that the influence of the type specimen pulled factors to the properties of crystal size,as well as the internal structure and the direction of the force.There is a complex positive curve between the three,which affects the physical properties of the sample.In the experiment,the laser power,the amount of out of focus,and the scanning speed of the three variables will affect the performance of the obtained samples.It is also found that the shape length and orientation of the columnar crystals can be controlled by the orientation of the parameters.In addition,the physical and mechanical properties of the nickel base alloy specimens can be further strengthened by the late heat treatment of the obtained alumina reinforced nickel base alloy specimens.Appropriate post heat treatment process,the pattern can be evenly enhanced. |
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