激光冲击处理对GH3039高温合金磨损性能的影响

Effect of Laser Shock Processing on Wear Properties of GH3039 Superalloy

为了提高GH3039高温合金抗磨损能力,采用高能激光束对GH3039高温合金试样进行冲击处理。室温下,开展了GH3039母材和激光冲击试样干摩擦对比实验。采用光学显微镜、扫描电镜和三维光学轮廓仪分析了激光冲击前后试样微观结构、磨痕和表面粗糙度。结果表明:激光冲击之后,试样表层晶粒明显细化,表面粗糙度略有增加,形成了深度达1.8 mm左右硬化层;同母材相比,激光冲击试样表面显微硬度提高了25.8%,磨损率降低了46.4%;此外,母材和冲击试样的磨损量均随着时间的延长而增大,但相同时间下,激光冲击试样的磨损量明显低于母材,说明激光冲击处理能显著提高GH3039高温合金抗磨损性能,这归因于激光冲击处理诱导的晶粒细化和形变强化。

In order to improve the wear resistance of GH3039 superalloy,GH3039 superalloy samples were peened by high-energy laser beam.The dry friction experiments of GH3039 base metal and laser impacted samples were carried out at room temperature.The microstructure,wear mark and surface roughness of the samples before and after laser shock peening(LSP)were analyzed by optical microscope,scanning electron microscope and three dimensional optical profile instrument.The results showed that after laser impact,the surface grain of the sample was obviously refined,the surface roughness was slightly increased,and the hardened layer with a depth of about 1.8mm was formed.Compared with base metal,the surface microhardness of the laser impacted sample is increased by 25.8% and the wear rate is decreased by 46.4%.In addition,the wear of both base metal and laser impact sample increases with the increase of time,but at the same time,the wear of laser impact sample is significantly lower than that of base metal,indicating that the wear resistance of GH3039 superalloy can be significantly improved by laser impact treatment,which is attributed to the grain refinement and deformation strengthening induced by LSP.