Chen Yang, Zhihong Dong, Changtai Chi, Yujiang Xie, Xiao Peng. Microstructure and Mechanical Properties of 24CrNiMo Alloy Steel Formed by Selective Laser Melting[J]. Chinese Journal of Lasers, 2020, 47(5): 0502008
- Chinese Journal of Lasers
- Vol. 47, Issue 5, 0502008 (2020)
Fig. 1. Morphology and particle size distribution of 24CrNiMo alloy steel powder. (a) Morphology; (b) particle size distribution
Fig. 2. Schematic of scanning strategy of SLM forming
Fig. 3. Size of tensile specimen
Fig. 4. XRD patterns of SLM-formed alloy steel and as-cast alloy steel (P=320 W, v=950 mm/s)
Fig. 5. OM morphology of alloy steel. (a) As-cast alloy steel(etched by 4% nital); (b)(c) XOZ cross-sections of SLM-formed alloy steel (etched by 4% nital and Lepera solution, P=320 W, v=950 mm/s)
Fig. 6. TEM images of molten pool zone and heat affected zone of SLM-formed alloy steel (forming parameters: P=320 W, v=950 mm/s). (a)--(c) Molten pool; (d)--(f) heat affected zone
Fig. 7. OM images of XOZ cross-section of SLM-formed alloy steel with different laser parameters (etched by 4% nital)
Fig. 8. SEM images of XOZ cross-section of SLM-formed alloy steel with different laser parameters (etched by 4% nital)
Fig. 9. Relative density of SLM-formed alloy steel with different laser parameters
Fig. 10. Schematics of XOZ cross-section morphology evolution of SLM-formed alloy steel with different parameters. (a) Low energy input; (b) high energy input
Fig. 11. Microhardness of molten pool zone and heat affected zone in XOZ cross-sections of SLM-formed alloy steel with different laser parameters
Fig. 12. Tensile curves of SLM-formed alloy steel and as-cast alloy steel
Fig. 13. Tensile fractures of SLM-formed alloy steel and as-cast alloy steel. (a) Sample 2#; (b) sample 3#; (c) as-cast alloy steel
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Table 1. Chemical composition of 24CrNiMo alloy steel powder, SLM-formed alloy steel and as-cast alloy steel
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Table 2. Mechanical properties of SLM-formed alloy steel and as-cast alloy steel
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