Dissolution behavior and kinetics of the γ′ precipitates within a novel powder metallurgy Ni-based superalloy

• DOI: 10.1016/j.jmrt.2024.03.198
• Publication Date: 2024-03-26T18:13:57Z
• Authors: Jie Wang; Hailiang Huang; Dan Xin; Jichong Hu; Hua Zhang; Jingjing Ruan; Xin Zhou; Shangzhou Zhang; Liang Jiang
• Keywords: Coalescence (physics); Isothermal process; Powder Metallurgy

Isothermal heat treatment experiments were used to studied the dissolution behavior and kinetics of γ′ precipitates within hot-extruded novel powder metallurgy Ni-based superalloy A1. The characteristics accurately rapidly extracted by deep learning methods. JMAK models established predict change area fraction during treatment. determination coefficient R2 model is 0.99. results indicate that sequence, morphological evolution, mechanisms three types are different. small-sized tertiary (γ′t) dissolve first, while larger-sized primary (γ′p) last. After 15 min at 1120 °C, there only a small amount with 0.19 ± 0.03 % fraction. And was not significant changed over time. 1 1150 completely dissolved. During process low temperature subsolvus (1060 1090 °C), large-sized γ′s grown expense consuming precipitates, tend towards directional arrangement due elastic interaction energy. process, γ′p spilt strain energy uneven diffusion alloying elements, neck-connected coalescence coarsening occurs overlapping fields.