Study on Wear Behaviors of Ni₃Al/Cr-Carbides Cladding Layer on High Strength Steel Substrate

Abstract

A cladding layer of Ni3Al matrix composite reinforced with 18 vol. % Cr-carbides was applied by using tungsten inert gas (TIG) welding process on high strength steel substrate. The filler metal as welding wire prepared by horizontal continuous casting process with a composition of Ni-2.5C-30Cr-9Al-0.02B (in wt. %) is used. A bulk material of NAC-alloy composite with 18 vol. % Cr3C2-particles produced by Hot Isostatic Pressing (HIP) was also investigated as a reference material. The composition of NAC-alloy is Ni-9.87Al-11.63Fe-0.50Mn-0.50Ti-0.2B in weight percentage. The pin-on-disk (POD) tribometer tests were carried out at room temperature in dry sliding condition at a pressure of 2.83 MPa (20N). The results revealed that Ni3Al/ Cr-carbides cladded layer by TIG process improved wear properties significantly with very low values of the friction coefficient (0.13 ± 0.02) and the specific wear rate (0.162 x 10-5 mm3/N·m) as compared to the reference HIP processed composite with the friction coefficient (0.68 ± 0.02) and the specific wear rate (0.908 x10-5 mm3/N·m) under the same testing conditions.

Microstructure and tribological properties of Cr3C2/Ni3Al composite materials prepared by hot isostatic pressing (HIP)

“…Recent studies have indicated that the high-temperature mechanical strength and hardness of Ni 3 Al alloys can be significantly improved by the addition of hard-particle reinforcements [11][12][13]. When present in iron, cobalt, and nickel matrices, chromium carbide exhibits high hot-hardness and excellent hightemperature oxidation resistance combined with good wetting ability [14][15]. Hence, chromium carbides are chosen frequently as hard-particle reinforcements for addition into Ni 3 Al-based matrices, to form Cr 3 C 2 /Ni 3 Al composites [8,16].…”

“…Bullock et al [17] studied directionally solidified Ni-Ni 3 Al-Cr 3 C 2 composites and found that the composites show better creep resistance than the matrix-only material. The wear performance of chromium-carbide-reinforced Ni 3 Al matrix composites under ambient temperature was studied by Gong et al [15][16]18]. The results indicated that composites presented better wear resistance compared with the matrix-only material.…”

The Effect of Laser Power on the Microstructure and Wear Resistance of a Ni3Al-Based Alloy Cladding Layer Deposited via Laser Cladding

“…Related studies have shown [26] that under the same test conditions, there is a certain correlation between the hardness of materials and their wear performance. Furthermore, the variation in the hardness of the laser cladding layer can also reflect the distribution of carbides in the laser cladding layer.…”

Microstructure and Wear Resistance of a Cr7C3 Reinforced Ni3Al Composite Coating Prepared by Laser Cladding

“…The rapid thermal process of laser cladding leads to non-equilibrium state of liquid solidification and, thus, an unequilibrium NiAl phase was formed. The NiAl phase may strengthen the Ni3Al matrix [33]. The residual coarse Cr3C2 in the mixed powder cladding layer is due to the large particle size of Cr3C2 in the mixed powder cladding layer, which only partially dissolves in the cladding layer [34].…”

“…EDS mapping of the alloyed powder cladding layer is shown in Figure 8. Considering the result of EDS mapping together with XRD analysis data, it can be determined that the black Cr and C elements containing rich phases could be a strengthening phase of Cr [33]. The residual coarse Cr 3 C 2 in the mixed powder cladding layer is due to the large particle size of Cr 3 C 2 in the mixed powder cladding layer, which only partially dissolves in the cladding layer [34].…”