Hongyu Li, Lianfeng Wei, Zeming Wang, Hui Chen, Na Zheng, Hengquan Zhang. Effect of Preheating Temperature on Microstructure and Stress of Laser Cladding Layer[J]. Laser & Optoelectronics Progress, 2021, 58(7): 0714004
- Laser & Optoelectronics Progress
- Vol. 58, Issue 7, 0714004 (2021)
Fig. 1. Morphologies of Lc-Sr-31 powder
Fig. 2. Schematic of coaxial powder feeding laser cladding process
Fig. 3. Test diagrams of residual stress of cladding layer. （a） Photo； （b） schematic
Fig. 4. Microstructures of cladding layer. (a) Without preheating; (b) 300 ℃ preheating temperature
Fig. 5. Energy spectrum analysis of cladding layer. (a) Without preheating； (b) 300 ℃ preheating temperature
Fig. 6. EDS line scanning of cladding layer without preheating. (a) Line scanning diagram; (b) element intensity change
Fig. 7. EDS line scanning of cladding layer with 300 ℃ preheating temperature. (a) Line scanning diagram; (b) element intensity change
Fig. 8. Microstructures of cladding layer without preheating. (a) M23C6 phase; (b) M7C3 phase
Fig. 9. Microstructures of cladding layer with 300 ℃ preheating temperature. (a) M23C6 phase; (b) （c） M7C3 phase
Fig. 10. Microhardness of cross-section with different preheating temperatures
Fig. 11. Microstructures of heat affected zone with different preheating temperatures. (a) Without preheating; (b) 100 ℃ preheating temperature; (c) 200 ℃ preheating temperature; (d) 300℃ preheating temperature
Fig. 12. Effect of preheating temperature on residual stress in X direction. （a） Without preheating； （b） 100 ℃； （c） 200 ℃； （d） 300 ℃
Fig. 13. Effect of preheating temperature on residual stress in Y direction. （a） Without preheating； （b） 100 ℃； （c） 200 ℃； （d） 300 ℃
Fig. 14. Stress at different preheating temperatures
Fig. 15. XRD at room temperature and 300 ℃ preheating temperature
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Table 1. Chemical composition of matrix material and Lc-Sr-31 iron-based powder
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