High-carbon nickel-based high-temperature alloy and preparation method and application thereof

By regulating the composition in high-carbon nickel-based high-temperature alloys and adopting a new thermally controlled solidification method, the problem of difficult control of the delta phase size and proportion caused by the high proportion of Laves in IN718 high-temperature alloys is solved, and the high-temperature mechanical properties and creep resistance of the alloy are improved.

CN119710367AActive Publication Date: 2025-03-28NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Application Number
CN202411896143.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-03-28
Estimated Expiration
2044-12-23

AI Technical Summary

Technical Problem

In high-temperature service environment, the Laves ratio in IN718 high-temperature alloy is high, which makes it difficult to control the size and proportion of the delta phase after heat treatment, affects the stability of the grain boundary, and reduces the high-temperature deformation resistance and reliability of the material.

Method used

By regulating the composition of high-carbon nickel-based high-temperature alloys, increasing the C content to reduce the proportion of Laves precipitation phase, controlling the precipitation of δ phase, so that it maintains a reasonable proportion and small size, refines the alloy grains and low porosity, a new thermally controlled solidification method is used to maintain the interdendrite liquid phase channel to ensure sufficient diffusion and distribution of elements.

Benefits of technology

The ratio of Laves precipitation phase in the alloy is reduced, the size and proportion of the delta phase are effectively controlled, the grain refinement of the alloy and the porosity are reduced, and the high-temperature mechanical properties and creep resistance are improved.

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Abstract

The invention belongs to the technical field of high-temperature alloys, and particularly relates to a high-carbon nickel-based high-temperature alloy and a preparation method and application thereof. The high-carbon nickel-based high-temperature alloy provided by the invention is prepared from the following components in percentage by mass: 0.10 to 0.12 percent of C, 17 to 21 percent of Cr, 50 to 55 percent of Ni, 0.2 to 0.8 percent of Al, 0.65 to 1.15 percent of Ti, 0.04 to 0.35 percent of Zr, 2.8 to 3.3 percent of Mo, 4.5 to 5.5 percent of Nb, 0.002 to 0.006 percent of B and the balance of Fe. The proportion of Laves precipitated phases is reduced by regulating and controlling the components of the high-carbon nickel-based high-temperature alloy, precipitation of the delta phase is effectively controlled, the reasonable proportion of the delta phase is kept, the size of the delta phase is reduced, alloy grains are refined, and therefore the high-temperature mechanical property of the high-carbon nickel-based high-temperature alloy is improved.
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