激光冲击强化TC17叶片前缘模拟件的抗FOD性能
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摘要
为研究激光冲击强化(LSP)叶片前缘抗外物损伤(FOD)性能,设计截面尺寸近似叶片前缘的缺口模拟件。采用YAG激光器(30 J和15 ns)和方形光斑(4 mm×4 mm)对TC17模拟件的缺口尖端进行双面LSP。采用X射线衍射仪、透射电镜、高频疲劳试验机和扫描电镜分别对LSP前后的残余应力、微观组织、疲劳性能和疲劳断口进行测试分析。结果表明,与未强化缺口模拟件相比,LSP-TC17合金的表面残余压应力最大值为-403MPa。LSP-TC17合金表面形成高密度位错、孪晶和纳米晶。LSP-TC17缺口模拟件的疲劳强度提高55.6%。TC17缺口模拟件的疲劳强化机理为高幅残余压应力和表面纳米晶。研究结果为LSP-FOD叶片奠定理论基础并提供工艺参考。
Notched fatigue samples were designed to approximate a typical leading edge of the blade with foreign object damage(FOD) in order to study the anti-fatigue performance of FOD-blades with laser shock processing(LSP).The surface at the crack tip of the notches of TC17 fatigue samples was LSPed with double sides.A YAG laser system was used with laser energy of 30 J,pulse width of 15 ns and square spot of 4 mm×4 mm.The residual stress,microstructure,fatigue performance and fatigue fracture of samples with and without LSP were measured and analyzed by X-ray diffractometer,Transmission Electron Microscope(TEM),high-frequency fatigue tester and Scanning Electron Microscope(SEM).The results show that compared with the notched fatigue samples without LSP,the maximum surface residual stresses of LSP-TC17 alloy is –403 MPa.High density dislocation,twin and nanocrystallite are formed in the surface.The fatigue strength of LSP-TC17 notched fatigue samples increases by 55.6%.Fatigue strengthening mechanism of TC17 notched fatigue samples is high amplitude compressive residual stress and surface nanocrystalline.The experiment results lay the theoretical foundation and provide the technological reference for LSP-FOD blades.
Notched fatigue samples were designed to approximate a typical leading edge of the blade with foreign object damage(FOD) in order to study the anti-fatigue performance of FOD-blades with laser shock processing(LSP).The surface at the crack tip of the notches of TC17 fatigue samples was LSPed with double sides.A YAG laser system was used with laser energy of 30 J,pulse width of 15 ns and square spot of 4 mm×4 mm.The residual stress,microstructure,fatigue performance and fatigue fracture of samples with and without LSP were measured and analyzed by X-ray diffractometer,Transmission Electron Microscope(TEM),high-frequency fatigue tester and Scanning Electron Microscope(SEM).The results show that compared with the notched fatigue samples without LSP,the maximum surface residual stresses of LSP-TC17 alloy is –403 MPa.High density dislocation,twin and nanocrystallite are formed in the surface.The fatigue strength of LSP-TC17 notched fatigue samples increases by 55.6%.Fatigue strengthening mechanism of TC17 notched fatigue samples is high amplitude compressive residual stress and surface nanocrystalline.The experiment results lay the theoretical foundation and provide the technological reference for LSP-FOD blades.
引文
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[4]Frankel P G,Withers P J,Preuss M et al.Mechanics of Materials[J],2012,55:130
[5]Ruschau J J,John R,Thompson S R et al.International Journal of Fatigue[J],1999,21(1):S199
[6]Nicholas T,Barber J P,Bertke R S.Experimental Mechanics[J],1980,20(10):357
[7]Nowell D,DuóP,Stewart I F.International Journal of Fatigue[J],2003,25(9-11):963
[8]Ding J,Hall R F,Byrne J et al.International Journal of Fatigue[J],2007,29(7):1339
[9]Hall R,Byrne J,Zhao T et al.Fatigue&Fracture of Engineering Materials&Structures[J],2008,31(5):386
[10]Spanrad S,Tong J.Materials Science and Engineering A[J],2011,528:2128
[11]Nie X,He W,Zhou L et al.Materials Science and Engineering A[J],2014,594:161
[12]Zabeen S,Preuss M,Withers P J.Acta Materialia[J],2015,83:216
[13]Lin B,Lupton C,Spanrad S et al.International Journal of Fatigue[J],2014,59:23
[14]Zhang Y K,Lu J Z,Ren X D et al.Materials&Design[J],2009,30(5):1697
[15]Gao Yukui(高玉魁).Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2016,43(9):2347
[16]Maawad E,Sano Y,Wagner L et al.Materials Science and Engineering A[J],2012,536:82
[17]Correa C,Ruiz De Lara L,Díaz M et al.International Journal of Fatigue[J],2015,70:196
[18]Ren X D,Zhan Q B,Yang H M et al.Materials&Design[J],2013,44:149
[19]Chu J P,Rigsbee J M,Bana?G et al.Metallurgical and Materials Transactions A[J],1995,26(6):1507
[20]See D W,Dulaney J L,Clauer A H et al.Surface Engineering[J],2002,18(1):32
[21]Li Yinghong(李应红),He Weifeng(何卫锋),Zhou Liucheng(周留成).Scientia Sinica Techological(中国科学:技术科学)[J],2015(1):1
[22]Zou Shikun(邹世坤),Guo Enming(郭恩明),Li Bin(李斌).Chinese Journal of Lasers(中国激光)[J],2011,38(6):76
[23]Pook L P.Metal Fatigue[M].Oxford:Clarendon Press,1974
[24]Nie X,He W,Zang S et al.Surface and Coatings Technology[J],2014,253:68
[25]Forman R G,Kearney V E,Engle R M.Sen-ito Kogyo[J],1993,49(3):459
[26]Lu J Z,Luo K Y,Zhang Y K et al.Acta Materialia[J],2010,58(16):5354
[27]Padiua H A,Boyce B L.Experimental Mechanics[J],2010,50(1):5
[28]Qin C,Zhang X,Ye S et al.Engineering Fracture Mechanics[J],2015,142:140
[29]Peters J O,Lütjering G.Metallurgical and Materials Transactions A[J],2001,32(11):2805
[30]Zheng Xiulin(郑修麟).Material Fatigue Theory and Engineering Application(材料疲劳理论与工程应用)[M].Beijing:Science Press,2013.
[31]Zhou J Z,Huang S,Sheng J et al.Materials Science and Engineering A[J],2012,539:360
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