Chinese Journal of Lasers, Volume. 48, Issue 22, 2202004(2021)
Microstructures and Thermal Fatigue Performance of 24CrNiMo Alloy Steel Formed by Selective Laser Melting
Fig. 1. Morphology and particle size distribution of 24CrNiMo powder. (a) Morphology; (b) particle size distribution
Fig. 2. Schematics of scanning strategies. (a) 0° linear scanning; (b) 45° rotating scanning; (c) 90° rotating scanning; (d) 67° rotating scanning
Fig. 5. 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
Fig. 6. 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
Fig. 7. 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
Fig. 8. XRD patterns of 24CrNiMo alloy steel formed by SLM under different scanning strategies
Fig. 9. Oxidation phenomenon during thermal fatigue. (a) Macroscopic features comparison of the sample before and after thermal fatigue test; (b) oxidation morphology
Fig. 10. Kinetic curves of thermal fatigue crack propagation of thermal fatigue specimens under different scanning strategies
Fig. 11. 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)
Fig. 12. Typical morphologies of thermal fatigue crack propagation. (a) 0° linear scanning; (b) 67° rotating scanning
Fig. 13. Grain boundary misorientation distributions. (a) X-Y section, 0° linear scanning; (b) X-Y section, 67° rotating scanning
Fig. 14. Morphologies of thermal fatigue crack. (a) Oxidation corrosion; (b) independent growth crack; (c) crack tip
|
Get Citation
Copy Citation Text
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
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)