目的 探索更为高效的激光冲击强化方式，提高TC17钛合金板片的疲劳寿命。方法 先采用设备4个光路对TC17钛合金板片进行强化，强化试验结束后，应用LXRD-X射线应力分析仪测定其表面残余应力，再对板片进行表面粗糙度测试。选取新的板片进行应力分布测试，确定TC17钛合金板片在一阶弯曲振型下的应力水平，然后在该应力水平下对经冲击强化和未经冲击强化的板片进行疲劳对比试验。结果 板片表面产生了残余压应力层，在相同激光能量下，椭圆形光斑强化区域的残余应力大约是方形光斑强化区域的1.33倍，且椭圆形区域各点残余应力数值相差更小。强化区域的表面粗糙度为0.25～0.34 mm，未强化区域的表面粗糙度为0.13～0.16 mm。疲劳试验时，未经激光冲击强化的板片均在6～11 min内发生断裂，而经激光强化后的4块板片中，1块未断裂，另外3块分别在59、381、709 min断裂。结论 激光冲击强化对材料性能起到了强化作用，且椭圆形光斑的强化优于方形光斑。强化后，板片的表面粗糙度增加了1倍，疲劳寿命提高了52倍。

The work aims to explore a more efficient laser shock peening method, and improve fatigue life of TC17 titanium alloy sheet bars. Firstly, TC17 titanium alloy sheet bars were peened with four optical paths, then surface residual stress of the sheet bars was measured with LXRD-X-ray stress analyzer, and finally surface roughness test was performed to the sheet bars. New sheet bars were selected to perform stress distribution test and determine stress level of the TC17 titanium alloy sheet bars in first-order bending mode. Then, fatigue comparison test was performed to original sheet bars and shock peened ones at the stress level. A residual compressive stress layer took shape on the surface of the sheet bars. Provided with the same laser energy, residual stress of elliptic spot peened area wasabout 1.33 times that of rectangular spot peened area.Residual stress value in each point in the elliptic area differed slightly from each other. Surface roughness of peened area was 0.25～0.34 mm, and for unpeened area, 0.13～0.16 mm. In the fatigue test, the sheet bars not receiving laser impact peening fractured in 6～11 minutes. Among 4 sheet bars receiving laser impact peening, one did not fracture, and the other three fractured in 59, 381 and 709 min, respectively. Laser shock peening can enhance properties of materials, peening ofelliptic spot is superior tothat of square spot. Surface roughness of sheet bars increases by 1 times and fatigue life by 53 times after laser shock peening.