Abstract
In this paper, the effect of applied multi-variant heat treatment on microstructure, phase composition and mechanical response of Haynes 282 nickel-based superalloy was investigated. For this reason, temperatures of both stages of standard two-stage aging treatment (i.e., 1010 °C/2 h + 780 °C/8 h) were extended to 900-1100 °C/2 h and 680-880 °C/8 h ranges, respectively. Consequently, 30 different variants of heat treatment were applied. The microstructural features of heat-treated samples were investigated by means of light microscopy and SEM/EDS methods, while mechanical properties were examined via microhardness measurements. It was found that by using various combinations of temperatures of the first and second stage of aging, the room temperature hardness of Haynes 282 alloy can be decreased by ~ 100 HV units or increased by up to 25 HV units as compared to that of the alloy subjected to the standard heat treatment schedule. The mechanical response of the alloy is determined by a complex structural evolution involving the secondary precipitation of γ′, M23C6 and M6C phases, as well as their interaction with the fcc γ matrix.
Highlights
Recent global market analyses and forecasts point toward the irreplaceability of nickel superalloys in the most crucial economic sectors that include defense, energy, marine, aerospace industries and other applications where high performance and reliable materials are required (Ref 1)
The results presented in recently published papers point toward a possibility of a further improvement of mechanical properties of Haynes 282 alloy via tailoring the heat treatment conditions
Since the solutionizing treatment was performed at temperature above the solvus of M23C6 carbides, both grain boundaries and grain interiors were free of secondary precipitation (Fig. 2b)
Summary
Recent global market analyses and forecasts point toward the irreplaceability of nickel superalloys in the most crucial economic sectors that include defense, energy, marine, aerospace industries and other applications where high performance and reliable materials are required (Ref 1). A continuous development of new superalloys is taking place, in order to keep up with a worldwide need to increase the efficiency of power units and plants. One such example is Haynes 282 superalloy, which was. The increased working temperature limit ( 800 °C) of Haynes 282 alloy makes it one of the main candidates for applications in advanced ultra-supercritical power plants (Ref 3). Recent studies by Osoba et al (Ref 7) clearly indicated the presence of M6C type carbides after the standard heat treatment. Joseph et al (Ref 9) reported that lowering temperature of the first
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