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Wear and corrosion resistance of Nb-V carbide layers produced in vermicular cast iron using TRD treatments

2020; Elsevier BV; Volume: 397; Linguagem: Inglês

10.1016/j.surfcoat.2020.126050

1879-3347

Fábio Edson Mariani, Gustavo Satoru Takeya, Amadeu Neto Lombardi, Carlos Alberto Picone, Luíz Carlos Casteletti,

High Entropy Alloys Studies

Nb, V and Nb-V carbide layers were produced by means of the diffusion thermo-reactive treatment (TRD) in a vermicular cast iron, in baths composed of sodium borate, aluminum, ferro‑niobium and/or ferro‑vanadium, at 1000 °C with 2 h treatment time. Austempering was carried out after the TRD treatment in a molten salt bath at 300 °C. The samples were characterized by optical microscopy, XRD, Vickers microhardness, Daimler-Benz Rockwell-C, microadhesive wear tests and corrosion tests using potentiodynamic polarization tests. The TRD treatments were highly efficient in the production of uniform carbide layers, with thicknesses above 25 μm and with good adhesions to the substrates. The layers showed hardness above 2300, 2500 and 3050 HV for the cases of Nb, V and Nb-V carbides, respectively. The wear resistance of the samples was increased from 10 to 30× in relation to the austempered substrate. The layers also showed corrosion resistance much higher than that of the substrate. The results obtained indicated the great effectiveness of the TRD treatment for the production of high performance carbide layers in vermicular cast iron.