Heat treatment process of nickel-based superalloy

Abstract

The invention provides a heat treatment process of a nickel-based superalloy, and belongs to the technical field of heat treatment. In the alloy solution heat treatment, heat preservation steps are added, and heat preservation time is prolonged, so that the large size of gamma' phase is subjected to redissolution, then, the heat preservation time at the standard solid solution temperature is shortened, it is guaranteed that the strengthening phase gamma' is completely redissolved, meanwhile, alloy grains are prevented from obviously growing, and then aging treatment is conducted; and the nickel-based superalloy subjected to heat treatment has better matching of room-temperature instantaneous strength, high-temperature instantaneous strength, high-temperature durability and creep property. According to the process, the solid solution effect of the material is guaranteed, excessive growth of the grain size of the material is avoided, it is guaranteed that the alloy grain size is stably controlled within the third level, meanwhile, the stretching and durability performance of the material is improved, the material performance is stable, the material standard requirement is met, the qualified rate of alloy bars and forgings is increased, and the material production cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a heat treatment process of a nickel-based superalloy. Background technique [0002] A large number of major equipment such as advanced aero-engines and steam turbines in my country use GH4080A. The main components involved include blades, fasteners, valves, shafts, etc. The quality of this alloy determines the safety of the above-mentioned major equipment to a certain extent. The microstructure and properties of GH4080A alloy are very sensitive to the heat treatment process. Improper process control can easily lead to uneven microstructures such as mixed grains / coarse grains, and the tensile properties and durability cannot meet the service requirements. At present, the main heat treatment system of the alloy is (1050~1080)℃×8h / AC+845℃±10℃×24h / AC+700℃±10℃×16h / AC. Due to the small size of the carbide and the primary γ' phase in the GH4080A alloy, the migration...

AI Technical Summary

Problems solved by technology

Due to the small size of the carbide and the primary γ' phase in the GH4080A alloy, the migration of the grain boundary cannot be effectively hindered, resulting in a significant growth of the alloy grains at this solution temperature for 8 hours, resulting in coarse grains or mixed grains Failure to meet material standard requirements

If the solid solution time is shortened, the solid solution effect of the alloy is insufficient, and a sufficient amount of fine dispersed γ’ phase cannot be fully precipitated in the subsequent aging process, which leads to the substandard tensile and durable properties of the material

In response to this problem, the domestic usually controls the forged grain size of GH4080A alloy, and the required range is narrow, and the problem of coarse structure often occurs in actual engineering, which affects the good application of the material

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