Abstract
In the present study, arc ion plating (AIP) was used to prepare a NiCoCrAlYHf coating (HY5 coating) on a carburized third-generation single-crystal superalloy DD10. The interdiffusion behavior of the carburized superalloy with an HY5 coating was investigated for a 1000 h oxidation time at 1100 °C. Carburization enhanced the interfacial bonding force and improved the microstructure of the NiCoCrAlYHf coating. An interdiffusion zone (IDZ) formed after a 300 h oxidation time, and the formation of a carburized layer effectively suppressed an inward diffusion of cobalt, aluminium, and chromium to the DD10 superalloy as well as an outward diffusion of nickel and refractory elements for instance rhenium and tungsten to the HY5 coating that occurred in static air at 1100 °C. The roles of the carburized layer in affecting thermal cyclic oxidation and element interdiffusion were studied. Subsequently, a modified form of the Boltzmann–Matano analysis was used to present the interdiffusion coefficients of aluminium.
Highlights
In the past decades, Ni-based single-crystal superalloys evolved for several generations for turbine blades of gas turbines and jet engines, which require thermal efficiency, oxidation resistance, and mechanical strength [1,2,3]
The diffusion mechanism is applied to carburization, which can be explained that carbon diverts to the surface of the DD10 superalloy and generates a 10–20 μm thickness gradient of a compact layer as a carburized layer
This carburized layer helped maintain a good combination with the substrate DD10 superalloy
Summary
Ni-based single-crystal superalloys evolved for several generations for turbine blades of gas turbines and jet engines, which require thermal efficiency, oxidation resistance, and mechanical strength [1,2,3]. A Ni-based single-crystal superalloy developed successfully these years, named DD10, containing additive refractory elements include tungsten, molybdenum, and rhenium, has been extensively explored as gas-turbine blades in advanced aero craft engines to improve their mechanical properties at high temperatures during work time. These refractory elements accelerate the conformation of an unfavorable topologically closepacked phase (TCP) and a secondary reaction zone (SRZ) after long-time high-temperature exposure [10,11]. The behavior of DD10 superalloy modified by carburization and the effect of this treatment on the interdiffusion behaviors of these materials under high temperatures were discussed
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