Effect of multiple laser cladding processes on microstructure and properties of Fe-based alloy coatings
FU Li1,3, HUANG Huanhuan1,3, CHEN Xiaoming1,3, LIU Wei1,3, ZHAO Jian2,3, ZHANG Lei1,2, ZHOU Xialiang1,3
1. Standard & Quality Control Research Institute, Ministry of Water Resources, Hangzhou 310012, China;; 2. Hangzhou Machinery Design & Research Institute, Ministry of water resources, Hangzhou 310012, China;; 3. Key Laboratory of Surface Engineering of Equipments for Hydraulic Engineering of Zhejiang Procince,Hangzhou 310012, China
Abstract：A FeCoCrNiAlTiSi Fe-based alloy coating was prepared on the substrate Q235 steel surface by repetitive preplaced powder type laser cladding technology. XRD, SEM, microhardness, and electrochemical test, etc. were used to measure and analyze the phase composition, morphology, microhardness and electrochemical properties of the coating. The results show that the composition of the coating is basically stable as Fe50Co10Cr10Ni10Al1Ti1Si10 phase after repeated cladding. Its main structure transforms from BCC to FCC and with enriched (Al,Ni) phase. In addition, the microhardness value is higher than that of the base material, approaching closing to 700 HV, and the over-passivation potential extends to 0.212 V and corrosion current density 1.69×10-6 A/cm2.
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2019, Vol. 24 
