Heat Treatment of Additively Manufactured Nickel-Based Superalloy Haynes 282

This study demonstrates the effectiveness of a single-step heat treatment (850 °C, 4 hours) for additively manufactured (AM) Haynes 282 components. Mechanical testing reveals that this approach achieves a balance of yield strength (YS) and ductility comparable to traditional multi-stage heat treatments for wrought Haynes 282, with a YS of approximately 1 GPa and ductility of 20 to 30 pct at room temperature, while reducing property anisotropy. Microstructural analysis shows that the developed single-step heat treatment results in the formation of uniformly distributed γ′ precipitates (~ 40 nm) and grain boundary carbides (presumably Cr-rich M23C6 and Mo-rich M6C), which provide intragranular and intergranular strengthening. These features are similar to those achieved through conventional multi-stage heat treatments. Compared to conventional methods, this single-step process reduces the total heat treatment time by over 50 pct, eliminates the solutionizing step, and simplifies processing complexity—making it suitable for complex near-net-shape AM components.