Microstructure and Mechanical Properties of Atmospheric-plasma-sprayed and TIG-remelted Fe-based Coating
DONG Tianshun1, ZHENG Xiaodong1,2, LI Guolu1, WANG Haidou2, ZHOU Xiukai1,2, LI Yalong1,2
1 School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130; 2 National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering,Beijing 100072
Abstract: In the present work, we applied tungsten inert gas arc (TIG) process to remelt a Fe-based coating which had been deposited by atmospheric plasma spraying technique, and characterized and determined the remelted coating’s microstructure and mechanical properties. The results showed that after TIG remelting, the lamellar structure, pores, unmelted particles and inclusions of the as-sprayed coating are eliminated, the porosity significantly decreases from 4% to 0.4% and the microstructure becomes quite compact. The as-sprayed coating consists mainly of microcrystalline region, nanocrystalline region and transition region, and has a low crystallinity and disordered atomic arrangement. The remelted coa-ting, on the contrary, contains single crystal region and (Fe,Cr)23C6 phase, displays no microcrack at the pricipitates/matrix interfaces, and has better crystallization and atomic arrangement. A clear gap could be observed between the as-sprayed coating and the substrate, thus, the bon-ding formed between the as-sprayed coating and substrate is ascribed to mechanical bonding. However, the “white light belt” emerged at the interface between the remelted coating and substrate, the remelted coating was bonded with the substrate metallurgically. Compared with the as-sprayed coating, the average microhardness and elastic modulus of the remelted coating increased by 33.4% and 53.2% respectively, and the surface roughness of the remelted coating decreased by 43.2%. Therefore, TIG remelting process has considerable effect for improving the microstructure and mechanical properties of Fe-based coating.
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2019, Vol. 33 
