激光喷丸强化TC6钛合金的振动疲劳寿命及断口形貌分析

为了研究TC6钛合金激光喷丸强化(Laser Shocking Peening,LSP)处理后对振动疲劳寿命的影响,采用不同喷丸次数的方法对TC6钛合金进行LSP处理,采用振动疲劳测试系统对振动试样进行振动疲劳测试,用X射线衍射仪和显微硬度计测试LSP前后试样的残余应力和硬度,研究LSP对TC6钛合金振动疲劳性能的影响,使用透射电子显微镜(TEM)观察LSP后的微观组织变化,最后采用扫描电子显微镜(SEM)对试样的振动疲劳断口进行观察,研究LSP对TC6钛合金振动疲劳断口形貌的影响。结果表明,LSP后TC6钛合金发生强烈塑性变形,产生大量的位错,能够抑制TC6钛合金试样中疲劳裂纹的萌生和扩展,改善材料的力学性能,从而有效地提高TC6钛合金试样的振动疲劳寿命。

Analysis of Vibration Fatigue Life and Fracture Topography of TC6 Titanium Alloy by Laser Peening

To study the impact of TC6 titanium alloy laser shocking peening(LSP)treatment on the vibration fatigue life,different shocking peening times were used to laser peening TC6 titanium alloy,and the vibration fatigue test system was used to test vibration fatigue on the samples.X-ray diffractometer and microhardness tester are used to test the residual stress and hardness of the samples before and after LSP,and to study the influence of LSP on the vibration fatigue performance of TC6 titanium alloy.The changes of microstructure after LSP was observed by transmission electron microscope(TEM),and finally observing the vibration fatigue fracture surface of the sample with scanning electron microscope(SEM)to study the influence of LSP on the vibration fatigue fracture surface of TC6 titanium alloy.The results show that the TC6 titanium alloy undergoes strong plastic deformation after laser shot peening,resulting in a large number of dislocations,which can inhibit the initiation and propagation of fatigue cracks in the TC6 titanium alloy sample,and improve the performance mechanical properties of material,thereby effectively improving the vibration fatigue life of TC6 titanium alloy samples.