Research On The Structure And Properties Of ZCuAl8Mn13Fe3Ni2 Under Electromagnetic Interference Solidification Conditions

With the development of the marine industry,higher requirements have been placed on the overall performance of ships and marine equipment.High-manganese aluminum bronze has good mechanical properties,exhibits excellent corrosion resistance in the atmosphere,fresh water,and seawater,and has high corrosion fatigue strength,so it is widely used in various equipment propellers,high pressure valve body,Pump body and pressure,wear parts.However,in the actual production process,the castings produced by the traditional casting methods have various degrees of defects,and the hermeticity,corrosion resistance and stress corrosion fatigue resistance of the casting products are less than one-third of that of the standard samples.This has affected the reliability and overall service life of key components of weapons and equipment under the marine environment.In order to study the process scheme for improving the quality of castings,this experiment uses a medium-frequency induction furnace to smelt the high-manganesealuminum bronze,and adds electromagnetic stirring during the alloy solidification process,combines the traditional alloy smelting,casting process and electromagnetic stirring process,and explores research.A brand new casting process system is based on the traditional alloy smelting process.Electromagnetic stirring is applied during the solidification of the alloy melt to improve the solidification structure of the alloy.The results show that:(1)The primary ?-Cu microstructure is obtained with the application of electromagnetic stirring during the solidification of the alloy.The grain size of the high-manganese aluminum bronze is inversely proportional to the current intensity of electromagnetic stirring;(2)The electromagnetic stirring frequency f When the electromagnetic stirring direction is fixed at 5 Hz and the direction of electromagnetic stirring is unidirectional,the overall quality of the highmanganese-aluminum bronze semi-solid slurry is the best,the average equivalent diameter is 50 ?m,and the round equiaxed crystal rate reaches 70.(3)When the frequency of electromagnetic stirring is 5Hz and the current is 300 A,bidirectional stirring is applied to the alloy liquid,and the agitated structure is almost like a paste,and the crystal grains are finer and rounder,and the average equivalent diameter is about the same condition.One-third of the one-way stirring,the round equiaxed crystal rate is almost 90%.The corrosion resistance of high-Mn-Al bronze specimens under different electromagnetic stirring conditions was studied by using the full-immersion test and the intergranular corrosion test,and compared with the pattern under the traditional fusion casting process.As a result,it was found that the high manganese aluminum bronze specimen subjected to electromagnetic stirring has better corrosion resistance than the specimen without electromagnetic stirring,and the corrosion rate of the two-way stirring specimen is significantly better than that of the one-way stirring specimen.Through the experimental study on the mechanical properties of the samples before and after electromagnetic stirring with high manganese aluminum bronze,it was found that the tensile strength and elongation of one-way electromagnetic stirring samples were higher than those of samples without electromagnetic stirring,and the average values were improved respectively.22.6% and 27%.However,the biaxially agitated specimens were broken apart from the measured gauge length,and the fracture surfaces exhibited more non-metallic inclusions,indicating that the biaxial agitation was not conducive to the floating of impurities in the solidification process of the alloy liquid.