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Laser & Optoelectronics Progress, Volume. 57, Issue 1, 011403(2020)

Effect of Laser Power for Metal Selective Laser Melting on Morphology of 316L Stainless Steel Molten Pool and Residual Stress

Peiying Bian1、* and Enhuai Yin2
Author Affiliations
  • 1Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, Xi'an Key Laboratory on Intelligent Additive Manufacturing Technologies, Xi'an University, Xi'an, Shaanxi 710065, China
  • 2The 20th Research Institute of China Electronics Technology Group Corporation, Xi'an, Shaanxi 710068, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (9)
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    References (24)
    Cited By (5)
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    Figures & Tables(9)
    316 stainless steel powder

    Fig. 1. 316 stainless steel powder

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    Samples after SLM forming (on the substrate)

    Fig. 2. Samples after SLM forming (on the substrate)

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    Test methods represented by CAD drawings

    Fig. 3. Test methods represented by CAD drawings

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    Residual stress test platform

    Fig. 4. Residual stress test platform

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    Morphologies of molten pool cross section of SLM formed samples for different process parameters. (a)P=160 W, v=600 mm/s, chess scanning (No.1);(b) P=160 W, v=600 mm/s, stripe scanning (No.2); (c) P=200 W, v=800 mm/s, stripe scanning (No.3); (d) P=200 W, v=600 mm/s, stripe scanning (No.4); (e) P=200 W, v=600 mm/s, chess scanning (No.5); (f) P=240 W, v=800 mm/s, stripe scanning (No.6)

    Fig. 5. Morphologies of molten pool cross section of SLM formed samples for different process parameters. (a)P=160 W, v=600 mm/s, chess scanning (No.1);(b) P=160 W, v=600 mm/s, stripe scanning (No.2); (c) P=200 W, v=800 mm/s, stripe scanning (No.3); (d) P=200 W, v=600 mm/s, stripe scanning (No.4); (e) P=200 W, v=600 mm/s, chess scanning (No.5); (f) P=240 W, v=800 mm/s, stripe scanning (No.6)

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    Comparison of residual stresses in SLM formed samples with different process parameters. (a) No. 1 and No. 5; (b) No. 2 and No. 4; (c) No. 3 and No. 6

    Fig. 6. Comparison of residual stresses in SLM formed samples with different process parameters. (a) No. 1 and No. 5; (b) No. 2 and No. 4; (c) No. 3 and No. 6

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    Average residual stress boxplots of SLM formed samples for different process parameters

    Fig. 7. Average residual stress boxplots of SLM formed samples for different process parameters

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    • Table 1. Orthogonal experiment table of SLM sample

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      Table 1. Orthogonal experiment table of SLM sample

      No.Power P /WScanning speed v /(mm·s-1)Scan trajectorySerial No.
      1160600Chess scanning(grid size of 2.5 mm)11,12,13
      2160600Striped scanning(deflection degree of 30°)21,22,23
      3200800Striped scanning(deflection degree of 30°)31,32,33
      4200600Striped scanning(deflection degree of 30°)41,42,43
      5200600Chess scanning(grid size of 2.5 mm)51,52,53
      6240800Striped scanning(deflection degree of 30°)61,62,63

    • Table 2. Comparison of molten pool diameters and residual stresses of SLM formed samples

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      Table 2. Comparison of molten pool diameters and residual stresses of SLM formed samples

      No.Power /WScanning speed /(mm·s-1)Scan trajectoryMolten pooldiameter /μmAverage residualstress /MPa
      1160600Chess scanning100123
      2160600Striped scanning150199
      3200800Striped scanning150286
      4200600Striped scanning190422
      5200600Chess scanning180324
      6240800Striped scanning200445
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    Peiying Bian, Enhuai Yin. Effect of Laser Power for Metal Selective Laser Melting on Morphology of 316L Stainless Steel Molten Pool and Residual Stress[J]. Laser & Optoelectronics Progress, 2020, 57(1): 011403

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Jun. 25, 2019

    Accepted: Jul. 11, 2019

    Published Online: Jan. 3, 2020

    The Author Email: Bian Peiying (banry3@163.com)

    DOI:10.3788/LOP57.011403

    Topics

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