“…As can be seen, the results indicated the higher UTS values of present work rather than other materials, especially for ODS-MWY. Figure 12 The comparison of UTS of investigating specimens with others results [21]. …”
Section: Resultsmentioning
confidence: 90%
“…This high strength behaviour is mainly related to the dispersion strengthening mechanism of oxides. The mechanical properties of ODS-MWY in comparison with mechanical alloyed [21] MA6000 with almost similar composition revealed the higher tensile strength even though the MA6000 alloy produces by thermomechanical treatment (rolling/extrusion).…”
In the present study, nickel-based oxide dispersion strengthened (ODS) alloys were prepared by mechanical alloying (MA) andspark plasma sintering (SPS) using the yttria-stabilised zirconia (YSZ) nanoparticle was used as the oxide additive. Then, the powder samples and consolidated ODS parts were examined using XRD, SEM, and mechanical properties of samples were investigated. The results showed, the lattice strain increases to about 0.461%, indicating that the misalignment density in the particles has risen sharply due to MA. XRD results showed that peak flattening was observed with increasing alloying time to 5 and 10 h. The measured relative density of the parts is 96-98%. The secondary phase in the microstructure was the carbide phase of type M7C3 and MC with an average size mainly less than 5 μm. The highest tensile strength observed in Mo/W containing alloy, which was much higher than conventional alloys such as IN738 and IN939.
“…As can be seen, the results indicated the higher UTS values of present work rather than other materials, especially for ODS-MWY. Figure 12 The comparison of UTS of investigating specimens with others results [21]. …”
Section: Resultsmentioning
confidence: 90%
“…This high strength behaviour is mainly related to the dispersion strengthening mechanism of oxides. The mechanical properties of ODS-MWY in comparison with mechanical alloyed [21] MA6000 with almost similar composition revealed the higher tensile strength even though the MA6000 alloy produces by thermomechanical treatment (rolling/extrusion).…”
In the present study, nickel-based oxide dispersion strengthened (ODS) alloys were prepared by mechanical alloying (MA) andspark plasma sintering (SPS) using the yttria-stabilised zirconia (YSZ) nanoparticle was used as the oxide additive. Then, the powder samples and consolidated ODS parts were examined using XRD, SEM, and mechanical properties of samples were investigated. The results showed, the lattice strain increases to about 0.461%, indicating that the misalignment density in the particles has risen sharply due to MA. XRD results showed that peak flattening was observed with increasing alloying time to 5 and 10 h. The measured relative density of the parts is 96-98%. The secondary phase in the microstructure was the carbide phase of type M7C3 and MC with an average size mainly less than 5 μm. The highest tensile strength observed in Mo/W containing alloy, which was much higher than conventional alloys such as IN738 and IN939.
“…The low percent elements from the Metco 32 powder, as boron and Si, representing 4.0 wt.% from 20 wt.% of the matrix (soft phase), are not detectable by EDS. Anyway, boron has the role of lowering the melting temperature, helping the formation of hard phases, especially with Ni-Ni 3 B [ 40 ], and supplementary augmenting the hardness of the coating. During the melting process, this element formed Ni compounds.…”
Cardan joints are used in transmissions between misaligned shafts, as in all-wheel-drive (AWD) cars and railway applications. Their functioning is accompanied by heavy cyclical loads, with the cardan cross spindles subjected to intensive abrasive wear and pitting. In this paper, a solution to the mentioned issue is proposed, thin anti-wear coatings of Metco 32 and Metco 72 metallic powders deposited by atmospheric plasma spray (APS) on cylindrical samples cut from spindles of two cardan crosses made of 40Cr10 and RUL2 steel. The morphological analysis of the coated surfaces was realized by scanning electron microscopy (SEM), and the elemental composition of the tested samples was elaborated by energy-dispersive X-ray spectroscopy (EDS). To investigate the wear resistance of the coated samples in dry and grease-lubricated conditions, tests at constant load and constant speed were carried out using an AMSLER tribometer. The results of greased tests proved that the expulsion of the lubricant from the tribological contact occurred no matter the combination of coated or uncoated samples. During grease-lubricated tests of ten minutes, the least coefficient of friction was measured for uncoated specimens with better surface finishing; but in dry friction tests, the lowest values of the mean friction coefficients were obtained for the Metco 72 coatings. The porous coatings may act as lubricant reservoirs in long-lasting tests, providing a solution to the expulsion phenomenon of the lubricant to the boundary outside the area of the larger-diameter roller.
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