2026 Zhuge ABD900AM Gamma Prime Precipitation

The c¢ precipitation behavior in additively manufactured ABD/C210 -900AM is quantified in the temperature range of 700 K to 1200 K (427 °C to 927 °C). Data for c¢ precipitate size distributions and median radii are reported as a function of annealing time and temperature. An empirical model predicting the median c¢ precipitate size during post-build heat treatment is established, and effective diffusion coefficients are determined at the three studied temperatures. A strong correlation between median c¢ precipitate size and bulk hardness is identified, revealing an optimum precipitate size of 10 to 20 nm for maximum hardness and enabling classification of the precipitation process into two stages: c → c + c¢ transformation and subsequent coarsening. A time–temperature–transformation (TTT) diagram is constructed and further rationalized using CALPHAD and TC-PRISMA modeling. Notably, interconnected c¢ morphologies are observed at early reaction times (r < 6 nm), indicating the possible involvement of spinodal decomposition in the precipitation mechanism. The work provides comprehensive datasets for thermal stability, mechanical response, and phase evolution in ABD/C210 -900AM and offers insights for post-processing strategies and predictive modeling in AM Ni-based superalloys.