Chinese Journal of Lasers, Volume. 48, Issue 22, 2202004(2021)

Microstructures and Thermal Fatigue Performance of 24CrNiMo Alloy Steel Formed by Selective Laser Melting

Lisha Ren, Hui Chen*, Yong Chen, Jun Qian, and Xiong Yang
Author Affiliations
  • Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
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    Figures & Tables(15)
    Morphology and particle size distribution of 24CrNiMo powder. (a) Morphology; (b) particle size distribution
    Schematics of scanning strategies. (a) 0° linear scanning; (b) 45° rotating scanning; (c) 90° rotating scanning; (d) 67° rotating scanning
    Schematics of thermal fatigue test equipment
    Size of thermal fatigue test specimen
    OM morphologies of 24CrNiMo alloy steel formed by selective laser melting (SLM) under different scanning strategies. (a) 0° linear scanning; (b) 45° rotating scanning; (c) 90° rotating scanning; (d) 67° rotating scanning
    Microstructures of 24CrNiMo alloy steel formed by SLM under 0° linear scanning strategy. (a) Molten pool; (b) inside of the molten pool; (c) remelting zone
    IPF images of 24CrNiMo alloy steel formed by SLM. (a) X-Y section, 0° linear scanning; (b) X-Y section, 67° rotating scanning; (c) Y-Z section, 0° linear scanning; (d) Y-Z section, 67° rotating scanning
    XRD patterns of 24CrNiMo alloy steel formed by SLM under different scanning strategies
    Oxidation phenomenon during thermal fatigue. (a) Macroscopic features comparison of the sample before and after thermal fatigue test; (b) oxidation morphology
    Kinetic curves of thermal fatigue crack propagation of thermal fatigue specimens under different scanning strategies
    Morphologies of thermal fatigue crack propagation of specimens formed with different scanning strategies. (a) 0° linear scanning (laser scanning path is parallel to the notch direction); (b) 45° rotating scanning; (c) 90° rotating scanning; (d) 67° rotating scanning; (e) 0° linear scanning (laser scanning path is perpendicular to the notch direction)
    Typical morphologies of thermal fatigue crack propagation. (a) 0° linear scanning; (b) 67° rotating scanning
    Grain boundary misorientation distributions. (a) X-Y section, 0° linear scanning; (b) X-Y section, 67° rotating scanning
    Morphologies of thermal fatigue crack. (a) Oxidation corrosion; (b) independent growth crack; (c) crack tip
    • Table 1. Chemical composition of 24CrNiMo powder

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      Table 1. Chemical composition of 24CrNiMo powder

      ElementNiMoSiCrMnCSFe
      Mass fraction /%1.810.470.211.120.720.230.0031Bal.
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    Lisha Ren, Hui Chen, Yong Chen, Jun Qian, Xiong Yang. Microstructures and Thermal Fatigue Performance of 24CrNiMo Alloy Steel Formed by Selective Laser Melting[J]. Chinese Journal of Lasers, 2021, 48(22): 2202004

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    Paper Information

    Category: laser manufacturing

    Received: Feb. 21, 2021

    Accepted: May. 25, 2021

    Published Online: Oct. 28, 2021

    The Author Email: Chen Hui (xnrpt@swjtu.edu.cn)

    DOI:10.3788/CJL202148.2202004

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