超声辅助激光喷丸对IN718镍基合金表面完整性的影响  

Influence of Ultrasonic-Assisted Laser Shock Peening on Surface Integrity of IN718 Nickel-Based Alloy

作　　者：孟宪凯[1,2] 陈韦宇 王春燕 程子龙 姚喆赫 王锟 宋福阳 林珂 Meng Xiankai;Chen Weiyu;Wang Chunyan;Cheng Zilong;Yao Zhehe;Wang Kun;Song Fuyang;Lin Ke(Institute of Advanced Manufacturing and Modern Equipment Technology,Jiangsu University,Zhenjiang 212013,Jiangsu,China;School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China;School of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China)

机构地区：[1]江苏大学先进制造与现代装备技术工程研究院,江苏镇江212013 [2]江苏大学机械工程学院,江苏镇江212013 [3]浙江工业大学机械工程学院,浙江杭州310014

出　　处：《光学学报》2024年第11期123-132,共10页Acta Optica Sinica

基　　金：国家重点研发计划(2023YFB4604300);国家自然科学基金(52375436,52005223);江苏省自然科学基金优秀青年基金(BK20220113)。

摘　　要：以IN718镍基合金为对象,采用超声辅助激光喷丸(ULSP)工艺对其表面进行强化处理。然后,利用透射电子显微镜测量晶粒、位错等微观组织特征。使用扫描共聚焦显微镜测试材料表面形貌,分析ULSP对表面粗糙度的影响规律。依次使用显微硬度计和X射线衍射应力测定仪对试样表面的显微硬度与残余应力进行测量,揭示ULSP的表面强化机理。结果表明,由于激光冲击波与超声冲击波组合作用下会出现晶粒细化、位错增殖与γ''相硬化效应,可在较低表面粗糙度(Ra=2.19μm)情况下,利用ULSP将IN718镍基合金表面硬度和残余压应力分别提高至377.5 HV与344.6 MPa,相对传统激光喷丸分别增加了10.4%与31.4%,为延长IN718镍基合金使用寿命提供一种有效手段。Objective IN718 alloy is commonly adopted in the manufacturing of components such as turbine engine hot-end parts,blades,discs,and critical fasteners due to its high strength,oxidation resistance,and weldability at high temperatures.With the development of new coating technologies,high-temperature-resistant coatings have reduced the actual service temperature of IN718 components.However,the enhancement of equipment performance and deterioration of operating environments have gradually made the surface structure and properties of nickel-based alloys cannot meet the high-end equipment demands.Currently,laser shock peening(LSP)technology has been employed to improve the surface properties of IN718 components.Nevertheless,the short interaction time of LSP with the material surface has caused limitations in enhancing the material surface properties.Meanwhile,LSP induces fish-scale-like plastic deformation pits on the material surface,thus increasing the surface roughness of processed workpieces.To mitigate surface roughness,existing studies often reduce laser energy density to decrease plastic deformation on the sample surface,which significantly reduces LSP enhancement performance.We utilize the ultrasonic-assisted LSP(ULSP)technique to treat the surface of the IN718 nickel-based alloy.The combination of laser shock waves and ultrasonic shock waves is employed to regulate the material surface structure and properties.The microstructural characteristics induced by ULSP and their evolution are analyzed,with their effects on microhardness and residual stress investigated.The surface strengthening mechanism of ULSP on IN718 nickel-based alloy is elucidated to provide support for enhancing the service life of IN718 nickel-based alloy in extreme environments such as fatigue and wear.Methods The material selected for this experiment is IN718 nickel-based alloy,which is machined into specimens with the dimension of 10 mm×10 mm×2 mm using a wire cutting machine.The LSP experiments are conducted using a Nimma2000 device with

关 键 词：激光光学 超声辅助激光喷丸 IN718镍基合金 晶粒细化 位错密度 残余应力 

分 类 号：TN249[电子电信—物理电子学]