Research On Forming M2052 Manganese-copper Alloy Based On SLM Technology And Its Post-processing Technology

With the increase of the requirement of structural vibration on damping performance of large equipment in aviation field,the research of high-damping vibration alloy materials has been paid more and more attention.The traditional high-damping Mn Cu alloy manufacturing process still has defects such as long production cycle,poor forgeability,and large geometric limitations.Therefore,in the field of 3D printing,Selection Laser Melting Technology(SLM)is used to prepare Mn Cu alloy and conduct research.In this paper,based on the existing process,the Vacuum Gas Atomization(VIGA)was used to prepare M2052 alloy powder,and SLM technology was used to prepare the powder into blank samples.The physical properties and microstructure of Mn Cu powder with different particle sizes were analyzed.The effects of different post-treatment processes on the mechanical properties of SLM samples were studied.The relation between strain amplitude,strain frequency and temperature characteristics of damping property of M2052 alloy formed by SLM was further studied.The results show:1、The M2052 powder prepared by VIGA has a high yield of 15-53μm fine powder,high powder sphericity,high bulk density>3.8g/cm~3,angle of repose<30°,good fluidity,meets the SLM process powder requirements.With the increase of powder size,the irregular and satellite ball powder content increases.2、There are many holes and microcracks on the surface of M2052 alloy prepared by SLM.After the solid solution aging treatment,the porosity of the sample is significantly reduced,and the density of the printed part combined with the HIP process can reach more than 99%.The mechanical properties of Mn Cu alloys prepared by SLM have obvious difference before and after heat treatment.The tensile strength and yield strength of the sample before heat treatment are612MPa and 518MPa,but the impact energy is low and the plasticity is poor.After solid solution aging treatment,the tensile strength and yield strength of the samples were 591MPa and 383MPa,and the plasticity was significantly higher than that of the printed parts.The sample density of HIP850+Solid solution aging composite process was greatly improved,specific elongation>20%,and the comprehensive mechanical properties were the best.3、The internal loss of M2052 alloy is related to temperature,frequency and strain amplitude:the samples with different post-treatment processes have the same damp-temperature variation trend,which first increases with the increase of temperature and then slowly decreases after reaching the peak.Under the condition of phase change temperature,it has a high damping platform.The internal friction has a great dependence on the frequency,which is more obvious at low frequency.The internal friction increases gradually with the increase of the strain amplitude and finally tends to be stable.The results showed that the samples of HIP850+Solid solution aging had both high damping and good mechanical properties.