Method for regulating strengthening phase of nickel-based superalloy via super-solvus treatment

By measuring the γ' phase transformation temperature and designing a scheme of "oversolution treatment + two-stage aging heat treatment", the internal stress and cracking problems caused by insufficient precipitation of the second phase in nickel-based superalloys during additive manufacturing were solved, resulting in a significant improvement in alloy performance. This scheme is applicable to a variety of nickel-based superalloys.

WO2026123903A1 Publication Date: 2026-06-18CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
CENT SOUTH UNIV
Filing Date
2025-09-26
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

In the additive manufacturing process, nickel-based superalloys are subject to oversaturation and internal stress caused by extreme temperature gradients and thermal expansion and contraction, which affects the precipitation of the second phase and increases the risk of cracking. Existing heat treatment processes lack the ability to control the precipitation of the second phase, which limits the improvement of alloy performance.

⚗Method used

By measuring the phase transformation temperature of the γ' phase, a scheme of "oversolution treatment + two-stage aging heat treatment" was designed to regulate the precipitation behavior of the γ' phase, optimize its size and morphology, release internal stress, avoid cracking, and improve the alloy performance.

🎯Benefits of technology

It significantly improves the mechanical properties of nickel-based superalloys, resulting in materials with both high strength and ductility. The process is simple, widely applicable, and suitable for a variety of nickel-based superalloys.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to the technical field of superalloy heat treatment and relates to a method for regulating a strengthening phase of a nickel-based superalloy via super-solvus treatment. The present invention provides, for the first time, a heat treatment solution for optimizing the precipitation of a second phase to improve the mechanical properties of an additively manufactured nickel-based superalloy. The solution comprises determining the phase-transition temperature of a γ' phase, and designing a solution of "super-solvus treatment + two-stage aging heat treatment". In this way, the precipitation behavior of the γ' phase is regulated, the size, morphology and quantity of the γ' phase are optimized, and the internal stress of the alloy is also released, thereby avoiding subsequent cracking, and greatly improving the mechanical properties of the alloy. Finally, a nickel-based superalloy having both high strength and ductility is obtained. The present invention can be widely applied to a variety of precipitation-strengthened nickel-based superalloys.
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