Thermal- and wear-resistant alloy arc welding depositions using composite and flux-cored wires with TiN, TiCN, and WC nanoparticles

• Published in: Journal of materials processing technology Vol. 272; pp. 100 - 110
• Main Authors: Sokolov, G.N., Zorin, I.V., Artem’ev, A.A., Elsukov, S.K., Dubtsov, Yu. N., Lysak, V.I.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2019; Elsevier BV
• Subjects: Abrasive wear; Aluminum; Arc deposition; Chemical precipitation; Chromium; Composite structure; Composite wires; Cooling; Electrodes; Fillers; Flux cored wires; Gas metal arc welding; Iron; Mass transfer; Molybdenum; Nanoparticles; Nickel; Nucleation; Particulate composites; Properties; Refractory material; Solid solutions; Solidification; Surfacing; Thermal resistance; Titanium carbonitride; Titanium nitride; Tungsten carbide; Wear resistance; Wire; Gas metal arc welding; Nanoparticles; Refractory material; Flux-cored wires; Composite wires; Properties; Composite structure
• ISSN: 0924-0136; 1873-4774
• DOI: 10.1016/j.jmatprotec.2019.05.014

[Display omitted] The studied GMAW processes – splitting the electrode into two wires, oscillation of the electrode, and cooling the weld pool metal with filler wire – reduce the arc thermal impact on the nanoparticles and improve their mass transfer into the solidifying metal. The nanoparticles in the wire fillers are recommended to be within 0.3–0.6 wt.%. Surfacing with two composite wires containing WC nanoparticles improves the properties of metal with a Ni3 Al-based matrix at temperatures within 1000–1200 °C. WC particles influence the composite metal formation, initiating precipitation from the γ+γ' solid solutions of strengthening phases in the form of intermetallides of (Zr,Ta,W)C type and ZrC carbides. The surfacing process with oscillation of the electrode flux-cored wire with TiCN particles improves the thermal and plastic resistance of the metal, with a matrix of the C–Fe–Cr–Ni–Mo–Ti–N system at temperatures within 750–950 °C. The composite metal with fine grains is formed under the influence of nucleation centres, in the form of TiCN nanoparticle clusters. The filler flux-cored wire with ultra-disperse TiN particles introduced in the weld pool, improves the resistance of deposited metal of the Fe–C–Cr–Mo–Ni–B system to abrasive wear at 500 °C. TiN particles initiate precipitation from the deposited metal matrix of strengthening phases in the form of (Ti, Mo)C 1−х carbides that are 1–4 μm in size. In conjunction with additional cooling of the melt near the solidification front, this helps to form the MMC structure in the melt.