Ming Pang, Wendan Tan. Microscopic Characteristic Analysis and Crack Suppression of Laser-Surface Remelting of Vermicular-Graphite Cast-Iron Valve Seats[J]. Laser & Optoelectronics Progress, 2019, 56(21): 211402
- Laser & Optoelectronics Progress
- Vol. 56, Issue 21, 211402 (2019)
Fig. 1. Substrate structure of vermicular-graphite cast-iron
Fig. 2. Macroscopic morphology of laser remelting zone
Fig. 3. Microstructures of central region of laser remelting layer. (a) V =5 mm/s; (b) V =3 mm/s; (c) V =1 mm/s
Fig. 4. Microstructures at interface between laser remelting layer and phase-transformation hardening layer. (a) V =5 mm/s; (b) V =3 mm/s; (c) V =1 mm/s
Fig. 5. Hardness distribution from substrate to top of remelting layer
Fig. 6. Crack numbers under variable laser parameters. (a) Variable laser scanning velocities; (b) variable laser powers
Fig. 7. Cracks on surface of remelting zone. (a) V =1 mm/s; (b) V =12 mm/s
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Table 1. Chemical compositions of vermicular-graphite cast-iron RuT300 (mass fraction, %)
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