The objective of this study was to investigate the weldability of a new laminated material based on nichrome powder alloy using tungsten inert gas welding. Results revealed that nichrome-laminated powder alloy could be successfully joined by TIG welding. Two typical fusion zones were formed between different layers (Ni cover layer and nichrome base layer) and weld metal. Moreover, fusion zone of nichrome powder alloy was jagged due to the presented porosity. Between nichrome powder alloy and the filler metal, elements diffusion was obvious and a transition zone about 80-85 µm was formed. Microhardness near the fusion zone of nichrome base layer side (210-250 MPa) is higher than that near the fusion zone of Ni cover layer . Phase constitutions of the welded joint consisted mainly of γ-Fe, δ-ferrite and γ-Ni (Fe, Cr). Furthermore, co-existing microstructure of γ austenite and a small amount of δ ferrite was observed in the weld seam. K e y w o r d s : powder alloy, tungsten inert gas welding, fusion zone, fine structure
HVOF and plasma spray processes were used to spray Cr3C2-NiCr Coatings. The coatings were characterized by x-ray diffraction, porosity, hardness, adhesive strength, thermal shock and cup tests. As a result, HVOF spraying can produce a coating with more stable phase structures, lower porosity, higher hardness, better adhesive strength, better toughness and higher erosion resistance. The HVOF sprayed coating had been successfully used in hearth roll of continuous annealing process lines (CAPL) in Baoshan steel & iron cooperation. Key Words: thermal spray, HVOF, plasma, Cr3C2-NiCr
The objective of this study is to investigate the brazeability of a new laminated composite with Ni-Cr-P filler metal in vacuum. Microstructure, microhardness and shear strength of the brazed joint were investigated by means of scanning electron microscopy, energy-dispersive spectroscopy, microsclerometer and electromechanical universal testing machine. Excellent joint of super-Ni/NiCr laminated composite to Cr18-Ni8 steel was obtained at 1040
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