FeNiCr/60%WC (wt) coatings with different Ti additions were deposited on P550 substrate by laser cladding to improve their nonmagnetic properties. The microstructures and chemical and phase ...compositions were examined using SEM, TEM, EDS and XRD, and the magnetic properties were measured using a Lake Shore7410 vibrating sample magnetometer. The results show that the addition of 1.0–4.0wt.% Ti could reduce the magnetism of FeNiCr/60%WC coatings to varying extent, depending on the content of Ti added. The relative permeability decreases at first with the increasing Ti additions, reaches a minimum of 1.006 when 2.5wt.% Ti is added, and then increases with further increasing Ti additions. The XRD, SEM and TEM results show that the phase constitution of the FeNiCr/60%WC coatings with different Ti additions mainly include γ-(Fe,Ni), WC, W2C and Fe3W3C, and a small amount of TiC, FeCr and (W,Ti)C1−X. In addition, a small amount of Fe2W is observed in the coatings where Ti additions are above 4.0%. Fe2W is ferromagnetic with a total magnetic moment of 3.3924 calculated by empirical electron theory (EET) that can affect the nonmagnetic properties of FeNiCr/60%WC coatings.
•The FeNiCr/60%WC coatings with different Ti additions were fabricated by laser cladding.•Nonmagnetic properties of the coatings were improved by Ti additions.•The magnetic properties and microstructure of the coatings with different Ti additions.•The magnetic moments of Fe2W phase was calculated.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The effect of Si addition on phase separation and soft magnetic properties of Cu0.6(FeCrC)0.4100-xSix (x = 3 and 8) immiscible composites produced by laser induction hybrid cladding (LIHC) has been ...investigated. The duplex structure of immiscible composites was composed of many Fe-rich particles dispersed within Cu-rich upper layer and large amounts of Cu-rich particles embedded within Fe-rich lower layer. However, the increasing Si addition not only induced the precipitation of intermetallic compound Cu6.69Si within Cu-rich upper layer, but also increased the area of Fe-rich layer, the size of Fe- and Cu-rich particles, as well as the solubility of Si in Fe- and Cu-rich phases. Moreover, the microhardness of Fe- and Cu-rich layers was increased to 747.3HV0.2 and 302.6HV0.2 in the Cu55.2(FeCrC)36.8Si8 immiscible composite, respectively, which was ~1.6 and ~1.8 times higher than that in the Cu58.2(FeCrC)38.8Si3 immiscible composite, due to solid-solution strengthening and dispersion strengthening. Compared to the Cu58.2(FeCrC)38.8Si3 immiscible composite, the Cu55.2(FeCrC)36.8Si8 immiscible composite presented a saturated magnetization of 13.7 emu/g, relatively lower coercivity of 24.9 Oe and higher Curie temperature of larger than 400 K due to appearance of ferromagnetic a-Fe(Si) phase.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
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