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Chinese Journal of Lasers, Volume. 51, Issue 16, 1602302(2024)

Effect of Heat Treatment on Microstructure and Mechanical Properties of Selective Laser Melted 18Ni300 Maraging Steel

Chao Xiang1,2、*, Tao Zhang1, Wenwei Wu3, Zhihang Zou1, Yongfei Sun3, Jinpeng Liu1, Xiaolei Xu1, and Enhou Han1,4、**
Author Affiliations
  • 1Institute of Corrosion Science and Technology, Guangzhou 510530, Guangdong , China
  • 2Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning , China
  • 3School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, Guangdong , China
  • 4School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641,Guangdong , China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (13)
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    References (21)
    Cited By (1)
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    Figures & Tables(13)
    Morphology and particle size distribution of 18Ni300 powder. (a) Morphology; (b) particle size distribution

    Fig. 1. Morphology and particle size distribution of 18Ni300 powder. (a) Morphology; (b) particle size distribution

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    Dimension and shape of 18Ni300 tensile specimen

    Fig. 2. Dimension and shape of 18Ni300 tensile specimen

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    Microstructures of 18Ni300 steel in different states. (a)‒(c) OM images; (d)‒(f) SEM images

    Fig. 3. Microstructures of 18Ni300 steel in different states. (a)‒(c) OM images; (d)‒(f) SEM images

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    XRD patterns of 18Ni300 steel in different states. (a) DA2 state; (b) different states

    Fig. 4. XRD patterns of 18Ni300 steel in different states. (a) DA2 state; (b) different states

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    EBSD diagrams of 18Ni300 maraging in different states. (a)‒(c) Inverse pole figures (IPFs); (d)‒(f) phase distributions

    Fig. 5. EBSD diagrams of 18Ni300 maraging in different states. (a)‒(c) Inverse pole figures (IPFs); (d)‒(f) phase distributions

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    Rockwell hardness of 18Ni300 maraging in different states

    Fig. 6. Rockwell hardness of 18Ni300 maraging in different states

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    Tensile properties of 18Ni300 maraging steel in different states. (a) Engineering stress-engineering strain curves; (b) statistical histogram of tensile properties

    Fig. 7. Tensile properties of 18Ni300 maraging steel in different states. (a) Engineering stress-engineering strain curves; (b) statistical histogram of tensile properties

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    Relationship between reverse-austenite content and strength

    Fig. 8. Relationship between reverse-austenite content and strength

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    Tensile fracture morphology of 18Ni300 maraging steel in different states. (a) PS; (b) DA2; (c) SA2

    Fig. 9. Tensile fracture morphology of 18Ni300 maraging steel in different states. (a) PS; (b) DA2; (c) SA2

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    • Table 1. Chemical composition of 18Ni300 maraging steel

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      Table 1. Chemical composition of 18Ni300 maraging steel

      ElementMass fraction /%
      Ni17.6
      Co8.75
      Mo4.69
      Ti0.71
      Al0.11
      Si0.068
      Mn0.01
      Cr0.005
      C0.0053
      O0.0252
      N0.0026
      FeBal.

    • Table 2. Heat treatment process of SLM formed 18Ni300 maraging steel

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      Table 2. Heat treatment process of SLM formed 18Ni300 maraging steel

      Sample

      No.

      		TreatmentHeating temperature /℃Insulation time /h

      Cooling

      method

      1PSNoneNoneNone
      2DA14806Furnace cooling
      3DA24906Furnace cooling
      4DA35006Furnace cooling
      5SA18201.5Air cooling
      4906Furnace cooling
      6SA28501.5Air cooling
      4906Furnace cooling
      7SA38801.5Air cooling
      4906Furnace cooling

    • Table 3. Volume fraction of α and γ phases and hardness of 18Ni300 maraging steel after different heat treatments

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      Table 3. Volume fraction of α and γ phases and hardness of 18Ni300 maraging steel after different heat treatments

      Sample No.TreatmentVolume fraction of α phase /%

      Volume fraction of γ

      phase /%

      		Rockwell hardness /HRC
      1PS99.20.834.1
      2DA194.95.152.8
      3DA292.37.751.7
      4DA393.66.452.7
      5SA199.80.253.3
      6SA299.70.353.5
      7SA399.90.153.3

    • Table 4. Tensile properties of 18Ni300 maraging steel after different heat treatments

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      Table 4. Tensile properties of 18Ni300 maraging steel after different heat treatments

      Sample No.TreatmentTensile strength /MPaYield strength /MPaElongation at break /%
      1PS1174.0±10.01104.0±7.411.8±1.1
      2DA12024.0±4.11971.8±21.25.6±1.0
      3DA22012.8±5.31970.5±18.36.9±0.3
      4DA31988.5±6.61926.0±9.95.0±1.1
      5SA12126.8±11.42092.5±23.95.0±0.7
      6SA22065.3±1.31989.3±20.95.8±0.9
      7SA32059.3±10.71993.0±4.64.0±0.6
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    Chao Xiang, Tao Zhang, Wenwei Wu, Zhihang Zou, Yongfei Sun, Jinpeng Liu, Xiaolei Xu, Enhou Han. Effect of Heat Treatment on Microstructure and Mechanical Properties of Selective Laser Melted 18Ni300 Maraging Steel[J]. Chinese Journal of Lasers, 2024, 51(16): 1602302

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    Paper Information

    Category: Laser Additive Manufacturing

    Received: Sep. 8, 2023

    Accepted: Nov. 3, 2023

    Published Online: Mar. 22, 2024

    The Author Email: Xiang Chao (cxiang@icost.ac.cn), Han Enhou (ehhan@icost.ac.cn)

    DOI:10.3788/CJL231183

    CSTR:32183.14.CJL231183

    Topics

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