超声振动对激光熔化沉积GH3536高温合金摩擦磨损性能的影响

Effect of ultrasonic vibration on the friction and wear properties of laser metal deposition GH3536 superalloy

摘要: 采用超声振动辅助激光熔化沉积GH3536高温合金，并对增材制造样品的微观组织和摩擦磨损性能进行了分析。结果表明：激光熔化沉积GH3536高温合金组织为粗大的柱状晶，平均晶粒宽度约180μm，施加超声振动后，柱状晶转变为等轴晶，平均晶粒尺寸下降到78μm。施加超声振动后，试样的平均摩擦系数由8.41降至8.17，磨损率由6.37×10^-7c m³/（N·m）降至4.25×10^-7c m³/（N·m），磨痕宽度由1122.81μm降至1003.21μm，磨痕深度由21.81μm降至19.71μm。。

Abstract: Microstructure and friction and wear properties of the ultrasonic vibration-assisted （UVA） laser melting deposition of GH3536 superalloy are analyzed.The results show that the microstructure of laser melting deposition GH3536 superalloy is coarse columnar grains with an average grain width of about 180μm.After applying ultrasonic vibration,the columnar grains are transformed into equiaxed grains,and the average grain size decreases to78μm.The average friction coefficient of the specimen decreases from 8.41 to 8.17,the wear rate decreases from6.37×10^-7cm~3/（N·m） to 4.25×10^-7 cm~3/（N·m）,the width of the abrasion mark decreases from 1122.81μm to1003.21μm,and the depth of the abrasion mark decreases from 21.81μm to 19.71μm after the application of ultrasonic vibration.