Chinese Journal of Lasers, Volume. 45, Issue 3, 302006(2018)
Microstructures and Formation Mechanism of Fe-Based Amorphous Coatings by Broad-Band Laser Cladding
Figures & Tables(8)
Fig. 2. Microstructure of amorphous coating prepared by laser cladding. (a) Full view of cladding layer; (b) bonding zone;(c) amorphous character zone; (d) surface of cladding layer
Fig. 3. Time evolution of temperature at different positions along depth direction of molten pool
Fig. 4. Temperature gradient and the maximum cooling rate at t=2 s along depth direction of molten pool
Fig. 5. Relationship between microstructure and G/R as well as that between microstructure and εc. (a) G/R and εc at different positions; (b) microstructure of coating
Fig. 7. Microstructures of coating in bonding zone under different scanning speeds. (a) 200 mm·min-1;(b) 300 mm·min-1; (c) 400 mm·min-1; (d) 500 mm·min-1
Table 1. Thermal physical parameters
View tableTable 1. Thermal physical parameters
Parameter Value Boltzmann constant 5.67×108 Ambient temperature /K 293 Radiation coefficient 0.5 Liquidus temperature /K 1804 Solidus temperature /K 1774 Thermal expansion coefficient /K-1 0.0001 Laser absorptivity 0.65 Convective heat-transfer coefficient /(W·m2·K) 80 Surface tension constant /(N·m-1·K-1) 2×10-4
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Wang Yanfang, Li Hao, Sun Xu, Song Zengjin, Li Juan, Shi Zhiqiang. Microstructures and Formation Mechanism of Fe-Based Amorphous Coatings by Broad-Band Laser Cladding[J]. Chinese Journal of Lasers, 2018, 45(3): 302006
Paper Information
Category: laser manufacturing
Received: Jul. 18, 2017
Accepted: --
Published Online: Mar. 20, 2018
The Author Email: Yanfang Wang (wang@upc.edu.cn)
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