期刊
SURFACE & COATINGS TECHNOLOGY
卷 344, 期 -, 页码 163-169出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2018.03.021
关键词
Laser cladding; Pulse frequency; Duty cycle; Carbides size; Corrosion resistance
资金
- National Nature Science Foundation of China [51605237]
- Natural Science Foundation of Shandong Province of China [ZR2017LEE011]
The effects of duty cycle and pulse frequency on the carbide size and properties of in-situ TiC-VC reinforced Fe-based cladding layers were studied. Heat input increased and carbide particle sizes decreased with increasing numbers of duty cycles. As the pulse frequency increased from 5 Hz to 5000 Hz, carbide particle sizes first increased and then decreased. Carbide refinement was mainly induced by a rapid cooling rate at low pulse frequencies, and high-speed Marangoni flow in the molten pool at high pulse frequencies. The hardness and corrosion resistance of cladding layers varied inversely with carbide particle size. The 5 Hz cladding layer had the highest hardness and best corrosion resistance, while the 500 Hz layer showed poor properties because of carbide agglomeration.
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