Precipitation Hardening A286 Superalloy with Additional 0.8%wt Aluminium for Waste Incinerator Application

This study examined how gamma prime and precipitation hardening impact the iron-nickel-based A286 superalloy during a four-hour aging heat treatment at 850°C. The characterization of samples after ageing was done employing a scanning electron microscope (SEM-EDX) to describe the grain structure arrangement, texture, and presentation of gamma (γ) and gamma prime (γ’). With an extra 0.8%wt, the data indicated that the main precipitates at temperatures below 840oC were gamma prime. The results demonstrated that the aluminum concentration of the austenitic matrix decreases at 840oC because of the precipitation mechanism involving the γ and γ' phases, which enhances the repassivation capabilities. The Eta phase enlarges at the cost of the gamma prime phase, and the arrangement of γ' precipitates within the matrix might lead to interruptions in the passive layer.