镍基合金电子束表面改性组织及摩擦性能研究

Modified microstructure and friction properties of nickel-based alloy electron beam surface

用不同聚焦电流对Inconel 625镍基合金进行表面改性试验,使用电子背散射衍射(EBSD)和摩擦磨损试验机(RTEC)分析其显微组织演变规律及表面损伤演变规律。结果表明:Inconel 625镍基合金经电子束处理后,显微组织中的FCC相呈条状和岛状。随聚焦电流的升高,镍基合金板的耐磨性能先增后减。720 mA聚焦电流下,磨损体积和磨损率最低,分别为0.141525 mm^(3)和1.41525×10^(-5)mm^(3)/(N·m),磨损率降低了26.64%,且氧化磨损和黏着磨损均较原始试样轻。这是因为经电子束表面改性后,柱状晶的晶粒尺寸较小且有序排列,使材料的硬度提高,在摩擦接触中更难发生塑性变形和磨损,表现出更好的摩擦性能。

Surface modification experiments were conducted on Inconel 625 nickel⁃based alloy using different focusing currents,and the microstructure evolution and surface damage evolution were analyzed using electron backscatter diffraction(EBSD)and friction wear testing machine(RTEC).The results indicate that after electron beam scanning treatment,the FCC phases in the microstructure of Inconel 625 nickel⁃based alloy exhibits strip and island like morphologies.As the focusing current increases,the wear resistance of nickel⁃based alloy plates first increases and then decreases.At 720 mA focusing current,the wear volume and wear rate were the lowest,which are 0.141525 mm^(3)and 1.41525×10^(-5)mm^(3)/(N·m),respectively.The wear rate was reduced by 26.64%.The oxidative wear and adhesive wear were relatively reduced compared with the original model.The reason is that after the modification of the electron beam surface,the grain size of the columnar crystal is small and orderly arranged,the hardness of the material improved,and it is more difficult to plastic deformation and wear in the frictional contact,so as to show better friction performance.