Fabrication of Amorphous Coating by Laser Cladding Using Industrial-grade Fe-based Alloy
GONG Yubing1, WANG Shanlin1, ZHANG Ziyang1, LI Hongxiang2, CHEN Yuhua1
1 National Defence Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063; 2 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083
Abstract: High-density amorphous coating with FeCoCrMoCBY bulk alloy as cladding material was fabricated by laser cladding on the surface of mild steel. The effect of different laser power on formation and microstructure of the coatings was discussed. The microhardness and corrosion resistance of the coating were tested by microhardness tester and electrochemical work station. The results show that the coatings of good formation and typically metallurgical bonding with the substrate is obtained,when laser power are changing from 17.6 W to 20.8 W with other parameter fixed. With the increase of laser power, the dilution rates go up, the tendency of cracks rise and the degree of amorphization decrease in the coating. When laser power is 17.6 W, the coating is mainly amorphous, the dilution rate is less than 24.2%, and the structure of the coating is dense, which includes heat affected zone, bon-ding zone and cladding zone. Moreover, the average microhardness of the coating is 1 330HV, which is about 9 times higher than the substrate. And the coating has more excellent corrosion resistance than 316L stainless steel in the 3.5% NaCl solution.
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2017, Vol. 31 
