Heat Treatment and Microstructural Evolution of Nickel-Based Superalloys
Summary
Nickel-based superalloys are essential in high-temperature applications such as turbine engines and chemical processing due to their exceptional creep resistance, mechanical strength and corrosion tolerance. The performance of these alloys depends critically upon carefully engineered microstructures achieved through controlled heat treatments. Typical protocols include solution treatment and ageing sequences that dissolve undesirable phases, homogenize elemental distribution and precipitate coherent intermetallic phases. During solution treatment, the elimination of segregation and harmful constituents such as Laves phases or carbides is achieved, followed by rapid cooling to freeze a uniform solid solution. Subsequent ageing induces the formation of ordered γ′ precipitates, while carbides and other stabilising phases may nucleate at grain boundaries or within grains to enhance high-temperature strength. The kinetics of dissolution and precipitation are governed by diffusion of alloying elements such as niobium, aluminium and titanium, and are strongly influenced by processing history, cooling rate and initial microstructure. Advances in additive manufacturing have further complicated this landscape, introducing fine microstructural scales and residual stresses that demand tailored heat-treatment schedules. Understanding the interplay between heat-treatment parameters and microstructural evolution is thus paramount to optimising alloy performance across scales and manufacturing routes, with direct implications for component life, fuel efficiency and environmental impact.
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Heat Treatment and Microstructural Evolution of Nickel-Based Superalloys publication trend
The graph below shows the total number of articles in heat treatment and microstructural evolution of nickel-based superalloys across all publications each year (not limited to Nature Index journals).
Technical terms
Homogenization: A high-temperature heat treatment that reduces chemical segregation and dissolves undesirable phases to produce a uniform solid solution.
Laves phase: An intermetallic compound, rich in refractory elements such as niobium, that forms during solidification and can embrittle the alloy if not removed.
Precipitation kinetics: The study of rate and mechanism by which second phases nucleate and grow during ageing or heat treatment.
NbC (Niobium carbide): A carbide precipitate that can contribute to grain boundary strengthening but may also act as stress concentrators if oversized.
Dendrite: A tree-like crystal structure that forms during solidification, influencing solute distribution and subsequent phase transformations.
References
- Dissolution kinetics of Laves phase during homogenization heat treatment of additively manufactured Inconel 718 superalloy. Journal of Materials Research and Technology (2023).
- Precipitation kinetics of niobium carbide (NbC) during homogenization heat treatment of additively manufactured inconel 718 superalloy. Journal of Materials Research and Technology (2023).
- Non-equilibrium solidification of undercooled Inconel 718. Journal of Alloys and Compounds (2024).
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