Effects of molybdenum on the microstructure and wear resistance of nickel-based hardfacing alloys investigated using Rietveld method

Microstructure and Properties of Nickel-based C276 Alloy Coatings by PTA on AISI 316L and API 5L X70 Steel Substrates

“…Therefore, hardness was also influenced by the amount of solid solution alloying on Ni-FCC dendrites, as previously reported by literature [9][10][11]15 . Aiming to identify the influence of PTA deposition current and substrate on coatings response to abrasive sliding wear, coatings were tested in the as-deposited condition with a constant set of testing parameters.…”

“…Coatings on API 5L X70 steel substrate exhibited hardness up to 8% superior than on AISI316 L stainless steel while the difference from deposition with 120 and 180 A reached 15% hardness reduction for both substrates. It indicates that interaction with the substrate (dilution) is the most significant factor influencing hardness 3,10,15 . Considering Carbon content of C276 alloy powder (0,10 wt %) and the Carbon content of substrates (0,02 wt % and 0,17 wt %), low carbide fraction on coatings were measured, varying from 1,81 to 3,59%.…”

“…Besides the effect of solid solution and second phase (carbide) on strengthening, Chromium contents higher than 15% improve oxidation and carburization resistance because of the formation of a protective oxide layer on the surface. The Nickel base of the alloy allows the retention of this formed superficial protective layer, especially on cyclic exposures at high temperature 3,[6][7][8][9][10] . Rolling cladding is largely utilized to produce coated steel sheet components attending different corrosion requirements.…”

“…When a welding process is involved, the effect of substrate and the degree of interaction due to processing parameters (measured by dilution) has to be taken into account 14,15 . All these factors alter the chemical composition of coatings and, consequently, the microstructure, impacting on coatings properties [7][8][9][10] . This work evaluated the effect of substrate on characteristics of Nickel-based coatings by plasma transferred arc thru processing current intensity variation in order to achieve different interaction degrees (dilution) with the substrate.…”

Impact of dilution on the microstructure and properties of Ni-based 625 alloy coatings

“…Engineering components can be protected from the aggressive operating conditions experienced in a wide range of harsh environments, as found in the chemical, petrochemical, nuclear reactors, food processing devices and steelmaking facilities [2][3][4][5][6][7][8].…”