Advances in Secondary Phase Evolution and Performance Enhancement of Allvac 718Plus Superalloy
Received date: 2024-06-05
Revised date: 2024-08-30
Online published: 2024-10-09
Supported by
National Natural Science Foundation of China(52034004);National Key Research and Development Program(2022YFB3705300)
Allvac 718Plus is a newly developed nickel-based superalloy derived from Inconel 718 alloy via composition optimization. Its maximum service temperature is approximately 55 oC higher than that of Inconel 718. With its excellent combination of creep resistance, fatigue resistance, machinability, and weldability, the Allvac 718Plus is highly suitable for manufacturing high-temperature components that can operate at up to 700 oC. As a precipitation-strengthened superalloy that is relatively new with limited application history, understanding the evolution of its secondary phases during heat treatment is crucial for optimizing its properties via microstructure control. In this context, the secondary phases found in Allvac 718Plus are introduced, including the primary strengthening γ′ phase, the main grain-boundary η phase, and the γ″, δ, σ, and C14 Laves phases that form under specific conditions. The precipitation behaviors of the γ′ and η phases during standard heat treatments are examined, along with the effects of presolidification and direct aging treatments. Additionally, the evolution of secondary phases during prolonged thermal exposure are explored. The results demonstrate that the formation of a more stable composite γ″-γ′ structure is a promising strategy to achieve long-term serviceability for the alloy. The influence of the microstructural evolution of secondary phases during high-temperature service on fatigue and creep resistance is also analyzed, focusing on the roles of the two primary secondary phases. Furthermore, this paper highlights the correlation between the sluggish kinetics of γ′ phase precipitation in Allvac 718Plus and its weldability. A comprehensive overview of the harmful effects of the Laves and η phases on cracking during welding and strain-age cracking is also provided.
TANG Liting , GUO Qianying , LI Chong , DING Ran , LIU Yongchang . Advances in Secondary Phase Evolution and Performance Enhancement of Allvac 718Plus Superalloy[J]. Acta Metall Sin, 2025 , 61(1) : 43 -58 . DOI: 10.11900/0412.1961.2024.00191
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