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Chinese Journal of Lasers, Volume. 47, Issue 5, 0502004(2020)

Influence of Defocusing Distance on Microstructure and Mechanical Properties of 3D-Printed 18Ni-300 Maraging Steel

Jiaqi Zhang1, Minjie Wang1、*, Jianye Liu2, Liuhui Niu2, Jinhai Wang2, and Mingyang Yi2
Author Affiliations
  • 1School of Mechanical Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China
  • 2Guangdong Hanbang 3D Tech Co., Ltd., Zhongshan, Guangdong 528427, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (17)
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    References (23)
    Cited By (7)
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    Figures & Tables(17)
    Morphology of 18Ni-300 maraging steel powder

    Fig. 1. Morphology of 18Ni-300 maraging steel powder

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    Effect of defocusing distance on surface roughness

    Fig. 2. Effect of defocusing distance on surface roughness

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    Upper surface morphology of single layer samples printed at different defocusing amounts. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

    Fig. 3. Upper surface morphology of single layer samples printed at different defocusing amounts. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

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    Upper surface morphology of multilayer block samples printed at different defocusing distances. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

    Fig. 4. Upper surface morphology of multilayer block samples printed at different defocusing distances. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

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    Effect of defocusing distance on dimensional deviation

    Fig. 5. Effect of defocusing distance on dimensional deviation

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    OM images of longitudinal section of samples printed at different defocusing distances. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

    Fig. 6. OM images of longitudinal section of samples printed at different defocusing distances. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

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    Effect of defocusing distance on relative density

    Fig. 7. Effect of defocusing distance on relative density

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    Optical morphology of samples printed at different defocusing distances. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

    Fig. 8. Optical morphology of samples printed at different defocusing distances. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

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    Microstructures of sample printed at defocusing distance of +2.5 mm. (a) OM image of upper surface; (b) SEM image of longitudinal section

    Fig. 9. Microstructures of sample printed at defocusing distance of +2.5 mm. (a) OM image of upper surface; (b) SEM image of longitudinal section

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    High-magnification SEM morphology of samples printed at different defocusing distances. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

    Fig. 10. High-magnification SEM morphology of samples printed at different defocusing distances. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

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    XRD spectra of samples printed at different defocusing distances. (a) Diffraction angle of 30°--90°; (b) diffraction angle of 43.5°--45°

    Fig. 11. XRD spectra of samples printed at different defocusing distances. (a) Diffraction angle of 30°--90°; (b) diffraction angle of 43.5°--45°

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    Effect of defocusing distance on mechanical properties. (a) Surface hardness; (b) tensile property

    Fig. 12. Effect of defocusing distance on mechanical properties. (a) Surface hardness; (b) tensile property

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    Tensile fracture of samples printed at different defocusing distances. (a) +2.5 mm; (b) +1.5 mm

    Fig. 13. Tensile fracture of samples printed at different defocusing distances. (a) +2.5 mm; (b) +1.5 mm

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    Tensile fracture of samples printed at different defocusing distances. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

    Fig. 14. Tensile fracture of samples printed at different defocusing distances. (a) +1.5 mm; (b) +2 mm; (c) +2.5 mm; (d) +3 mm; (e) +3.5 mm

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    • Table 1. Spot radius and power density under different defocusing distances

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      Table 1. Spot radius and power density under different defocusing distances

      Defocusingdistance /mmSpot radius /μmPowder density /(kW·mm-2)
      +1.551.0436.66
      +251.8235.56
      +2.552.8234.23
      +354.0132.74
      +3.555.3931.12

    • Table 2. Intergranular spacing of samples printed at different defocusing distances

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      Table 2. Intergranular spacing of samples printed at different defocusing distances

      Defocusing distance /mmSpacing /μm
      +1.50.269
      +20.254
      +2.50.233
      +30.228
      +3.50.176

    • Table 3. Mechanical properties of samples printed at different defocusing distances

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      Table 3. Mechanical properties of samples printed at different defocusing distances

      Defocusingdistance /mmTensilestrength /MPaYieldstrength /MPaElongation /%Upper surfacehardness /HRCSide surfacehardness /HRC
      +1.51175±2950±475.19±0.1136.48±0.8537.26±1.3
      +21193±31033±328.32±0.2837.52±0.5837.76±1.16
      +2.51215±21086±38.83±0.5037.7±0.7738.64±0.66
      +31188±5989±118.59±0.8637.38±0.7337.72±1.11
      +3.51187±3983±27.85±0.4637.24±0.4637.34±0.67
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    Jiaqi Zhang, Minjie Wang, Jianye Liu, Liuhui Niu, Jinhai Wang, Mingyang Yi. Influence of Defocusing Distance on Microstructure and Mechanical Properties of 3D-Printed 18Ni-300 Maraging Steel[J]. Chinese Journal of Lasers, 2020, 47(5): 0502004

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    Paper Information

    Category: laser manufacturing

    Received: Nov. 2, 2019

    Accepted: Dec. 12, 2019

    Published Online: May. 12, 2020

    The Author Email: Wang Minjie (zhangcgwwzjq@mail.dlut.edu.cn)

    DOI:10.3788/CJL202047.0502004

    Topics

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