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Chinese Journal of Lasers, Volume. 51, Issue 10, 1002323(2024)

Effect of Pore Type on High‑Temperature Plasticity of Inconel 625 Alloy Fabricated by Selective Laser Melting

Wei Nie1, Fencheng Liu1、*, Wenwei Hu1, Fenggang Liu1, Yongxiang Geng1, Hong Wang2, Wanqian Hu3, and Lianbo Wang3
Author Affiliations
  • 1National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, Jiangxi , China
  • 2Engineering Training Centre, Nanchang Hangkong University, Nanchang 330063, Jiangxi , China
  • 3Jiangxi Baohang Advanced Materials Co. Ltd., Nanchang 330200, Jiangxi , China
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    Figures & Tables(12)
    Morphology of Inconel 625 alloy powder prepared by gas atomization method. (a) Low multiple; (b) high multiple

    Fig. 1. Morphology of Inconel 625 alloy powder prepared by gas atomization method. (a) Low multiple; (b) high multiple

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    Schematics of Inconel 625 alloy sample fabricated by SLM. (a) Forming direction; (b) size diagram of tensile specimen

    Fig. 2. Schematics of Inconel 625 alloy sample fabricated by SLM. (a) Forming direction; (b) size diagram of tensile specimen

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    Morphological characteristics of pore defects in SLM-formed Inconel 625 alloy at different densities. (a) 98.1%; (b) 99.2%; (c) 99.1%; (d) 99.5%; (e) 99.0%

    Fig. 3. Morphological characteristics of pore defects in SLM-formed Inconel 625 alloy at different densities. (a) 98.1%; (b) 99.2%; (c) 99.1%; (d) 99.5%; (e) 99.0%

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    Pore defect formation diagrams. (a) Pore defect formed by keyhole collapse; (b) pore defect formed by overflowing bubbles; (c) pore formed by blowing of protective gas; (d) pore formed by insufficient energy

    Fig. 4. Pore defect formation diagrams. (a) Pore defect formed by keyhole collapse; (b) pore defect formed by overflowing bubbles; (c) pore formed by blowing of protective gas; (d) pore formed by insufficient energy

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    Stress-strain curves of as-deposited specimens of SLM-formed Inconel 625 alloy at 25 ℃ and 815 ℃ under different densities. (a) 25 ℃; (b) 815 ℃

    Fig. 5. Stress-strain curves of as-deposited specimens of SLM-formed Inconel 625 alloy at 25 ℃ and 815 ℃ under different densities. (a) 25 ℃; (b) 815 ℃

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    Tensile mechanical properties of as-deposited specimens of SLM-formed Inconel 625 alloy with different relative densities at 25 ℃ and 815 ℃. (a) Tensile strength; (b) plasticity

    Fig. 6. Tensile mechanical properties of as-deposited specimens of SLM-formed Inconel 625 alloy with different relative densities at 25 ℃ and 815 ℃. (a) Tensile strength; (b) plasticity

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    Plasticity comparison of as-deposited specimens of SLM-formed Inconel 625 alloy with different pore types and as-cast Inconel 625 alloy specimen at 25 ℃ and 815 ℃

    Fig. 7. Plasticity comparison of as-deposited specimens of SLM-formed Inconel 625 alloy with different pore types and as-cast Inconel 625 alloy specimen at 25 ℃ and 815 ℃

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    Morphologies and local magnification of tensile fractures of SLM-formed Inconel 625 alloy specimens with different pore types at room temperature and high temperature. (a)(d) Key-hole mode pores at room temperature; (b)(e) conduction mode pores at room temperature; (c)(f) irregular pore defects at room temperature; (g)(j) key-hole mode pores at high temperature; (h)(k) conduction mode pores at high temperature; (i) (l) irregular pore defects at high temperature

    Fig. 8. Morphologies and local magnification of tensile fractures of SLM-formed Inconel 625 alloy specimens with different pore types at room temperature and high temperature. (a)(d) Key-hole mode pores at room temperature; (b)(e) conduction mode pores at room temperature; (c)(f) irregular pore defects at room temperature; (g)(j) key-hole mode pores at high temperature; (h)(k) conduction mode pores at high temperature; (i) (l) irregular pore defects at high temperature

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    Tensile longitudinal sections and local magnification of SLM-formed Inconel 625 alloy specimens with different pore types at room temperature and high temperature. (a)(d) Key-hole mode pores at room temperature; (b)(e) conduction mode pores at room temperature; (c)(f) irregular pore defects at room temperature; (g)(j) key-hole mode pores at high temperature; (h)(k) conduction mode pores at high temperature; (i) (l) irregular pore defects at high temperature

    Fig. 9. Tensile longitudinal sections and local magnification of SLM-formed Inconel 625 alloy specimens with different pore types at room temperature and high temperature. (a)(d) Key-hole mode pores at room temperature; (b)(e) conduction mode pores at room temperature; (c)(f) irregular pore defects at room temperature; (g)(j) key-hole mode pores at high temperature; (h)(k) conduction mode pores at high temperature; (i) (l) irregular pore defects at high temperature

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    Dislocation configurations and local magnification of conduction mode pore defects in SLM-formed Inconel 625 alloy at room temperature and high temperature. (a)(b) At room temperature; (c)(d) at high temperature

    Fig. 10. Dislocation configurations and local magnification of conduction mode pore defects in SLM-formed Inconel 625 alloy at room temperature and high temperature. (a)(b) At room temperature; (c)(d) at high temperature

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    • Table 1. Nominal chemical compositions of Inconel 625 alloy powder used for test

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      Table 1. Nominal chemical compositions of Inconel 625 alloy powder used for test

      CompositionNiCrMoNbFeCoMn
      Mass fraction /%Bal.20.000‒23.0008.000‒10.0003.150‒4.150≤5.000≤1.000≤0.500
      CompositionCuSiTiAlCPS
      Mass fraction /%≤0.500≤0.500≤0.400≤0.400≤0.100≤0.015≤0.015

    • Table 2. Process parameters for porosity control of Inconel 625 alloy fabricated by SLM

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      Table 2. Process parameters for porosity control of Inconel 625 alloy fabricated by SLM

      Sample No.12345
      Laser power /W200300300300400
      Scanning speed /（mm/s）600600120015001800
      Energy density /（J/mm3）67100504044
      Density /%98.1±0.599.0±0.399.1±0.299.2±0.499.5±0.2
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    Wei Nie, Fencheng Liu, Wenwei Hu, Fenggang Liu, Yongxiang Geng, Hong Wang, Wanqian Hu, Lianbo Wang. Effect of Pore Type on High‑Temperature Plasticity of Inconel 625 Alloy Fabricated by Selective Laser Melting[J]. Chinese Journal of Lasers, 2024, 51(10): 1002323

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    Paper Information

    Category: Laser Additive Manufacturing

    Received: Dec. 8, 2023

    Accepted: Mar. 1, 2024

    Published Online: Apr. 17, 2024

    The Author Email: Liu Fencheng (fencheng999@163.com)

    DOI:10.3788/CJL231492

    CSTR:32183.14.CJL231492

    Topics

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