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Chinese Journal of Lasers, Volume. 52, Issue 8, 0802202(2025)

Effects of Laser Shock Peening on Microstructure and Corrosion Performance of TC4 ELI Alloy Welded Joints

Jinqian Zhang1, Yi Xiong1,2、*, Xuewen Liu3, Huafei Li1, Xiaoqin Zha4, and Fengzhang Ren1,2
Author Affiliations
  • 1School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, Henan , China
  • 2Provincial and Ministerial Co-Construction of Collaborative Innovation Center for Non-Ferrous Metal New Materials and Advanced Processing Technology, Luoyang 471023, Henan , China
  • 3The Ninth Oil Production Plant of Changqing Oilfield Company, Yinchuan 750000, Ningxia , China
  • 4National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Luoyang 471023, Henan , China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (14)
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    References (43)
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    Figures & Tables(14)
    Schematics of welding joint observation sites and track of light spot. (a)(b) Schematics of observation sites of test specimen; (c) track of light spot

    Fig. 1. Schematics of welding joint observation sites and track of light spot. (a)(b) Schematics of observation sites of test specimen; (c) track of light spot

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    Microstructure morphologies of welded joints. (a) Macrostructure; (b) magnified macrostructure; (c) WM; (d) HAZ; (e) BM

    Fig. 2. Microstructure morphologies of welded joints. (a) Macrostructure; (b) magnified macrostructure; (c) WM; (d) HAZ; (e) BM

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    SEM morphologies of welded joint cross-section after LSP treatment. (a) WM; (b) HAZ; (c) BM

    Fig. 3. SEM morphologies of welded joint cross-section after LSP treatment. (a) WM; (b) HAZ; (c) BM

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    EBSD morphologies of welded joint cross-section after LSP treatment. Grain orientations of (a) WM, (b) HAZ, and (c) BM; local orientation distributions of (d) WM, (e) HAZ, and (f) BM; grain boundary distributions of (g) WM, (h) HAZ, and (i) BM

    Fig. 4. EBSD morphologies of welded joint cross-section after LSP treatment. Grain orientations of (a) WM, (b) HAZ, and (c) BM; local orientation distributions of (d) WM, (e) HAZ, and (f) BM; grain boundary distributions of (g) WM, (h) HAZ, and (i) BM

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    TEM morphologies of welded joints before and after LSP treatment. (a) BM and (b) WM before LSP; bright-field images of (c) BM and (d) WM surface layer after LSP; dark field images of (e) BM and (f) WM surface layer after LSP; (g) (h) sub-surface of BM after LSP;(i) (j) sub-surface of WM after LSP

    Fig. 5. TEM morphologies of welded joints before and after LSP treatment. (a) BM and (b) WM before LSP; bright-field images of (c) BM and (d) WM surface layer after LSP; dark field images of (e) BM and (f) WM surface layer after LSP; (g) (h) sub-surface of BM after LSP;(i) (j) sub-surface of WM after LSP

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    XRD patterns of welded joints before and after LSP treatment. XRD patterns of (a) BM, (c) HAZ, and (e) WM before and after LSP treatment; magnified XRD patterns of ( b ) BM, (d) HAZ, and (f) WM before and after LSP treatment; (g) full width at half-maximum of α(101¯1) diffraction peak; (h) microscopic strain

    Fig. 6. XRD patterns of welded joints before and after LSP treatment. XRD patterns of (a) BM, (c) HAZ, and (e) WM before and after LSP treatment; magnified XRD patterns of ( b ) BM, (d) HAZ, and (f) WM before and after LSP treatment; (g) full width at half-maximum of α(101¯1) diffraction peak; (h) microscopic strain

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    Microhardness values of welded joints before and after LSP treatment

    Fig. 7. Microhardness values of welded joints before and after LSP treatment

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    Niquist plot of welded joints before and after LSP treatment

    Fig. 8. Niquist plot of welded joints before and after LSP treatment

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    Polarization curves of welded joints before and after LSP treatment

    Fig. 9. Polarization curves of welded joints before and after LSP treatment

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    SKP surface potential distributions of welded joints before and after LSP treatment. (a) Before LSP; (b) after LSP

    Fig. 10. SKP surface potential distributions of welded joints before and after LSP treatment. (a) Before LSP; (b) after LSP

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    • Table 1. Element compositions of TC4 ELI Alloy

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      Table 1. Element compositions of TC4 ELI Alloy

      ElementAlVFeCNHOTi
      Mass fraction /%6.3704.3000.2000.0100.0100.0010.120Bal.

    • Table 2. TIG welding process parameters

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      Table 2. TIG welding process parameters

      Weld process parameterContent
      Weld current220 A
      Arc voltage13 V
      Weld speed100‒120 mm/min
      Wire feed speed1200‒1500 mm/min
      Diameter of tungsten electrode6.4 mm
      Shielding gasPure argon （volume fraction of 99.9%）
      Gas flow rate16‒20 L/min

    • Table 3. Fitting parameters of each component of equivalent circuit of welded joints before and after LSP treatment

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      Table 3. Fitting parameters of each component of equivalent circuit of welded joints before and after LSP treatment

      SpecimenRs /（Ω·cm2）

      CPE1 /

      （S·cm-2·s-n1）

      		n1Rf /（Ω·cm2）

      CPE2 /

      （S·cm-2·s-n2）

      		n2Rc /（Ω·cm2）χ2 /10-3
      WM before LSP treatment6.2082.96×10-50.6863.292.08×10-60.9849.077×1051.910
      BM before LSP treatment11.101.44×10-50.8614.2×1031.42×10-50.6771.219×1062.100
      WM after LSP treatment8.3143.95×10-50.7723.25.88×10-60.9821.519×1060.3676
      BM after LSP treatment9.9041.58×10-50.8771.2×1031.17×10-50.7391.547×1061.008

    • Table 4. Parameters of polarization curves of welded joints before and after LSP treatment

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      Table 4. Parameters of polarization curves of welded joints before and after LSP treatment

      SpecimenCorrosion potential /VCorrosion current density /（A·cm-2 ）
      WM before LSP treatment-0.6501.154×10-6
      BM before LSP treatment-0.5251.010×10-6
      WM after LSP treatment-0.5424.859×10-7
      BM after LSP treatment-0.4844.500×10-7
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    Jinqian Zhang, Yi Xiong, Xuewen Liu, Huafei Li, Xiaoqin Zha, Fengzhang Ren. Effects of Laser Shock Peening on Microstructure and Corrosion Performance of TC4 ELI Alloy Welded Joints[J]. Chinese Journal of Lasers, 2025, 52(8): 0802202

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    Paper Information

    Category: Laser Surface Machining

    Received: Nov. 18, 2024

    Accepted: Jan. 14, 2025

    Published Online: Apr. 8, 2025

    The Author Email: Yi Xiong (xy_hbdy@163.com)

    DOI:10.3788/CJL241354

    CSTR:32183.14.CJL241354

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology