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A preparation method of gh4169 alloy with uniform distribution of granular delta phase

A GH4169, evenly distributed technology, used in the preparation of superalloy materials and the field of GH4169 alloy preparation, can solve the problems of high energy consumption, low efficiency, oxidation of workpiece or billet surface, etc., to reduce the degree of oxidation, reduce material waste, and improve alloy strength. Effect

Active Publication Date: 2016-10-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

The use of hot forming method has low efficiency and high energy consumption, and the surface of the workpiece or blank will also be severely oxidized due to high temperature.

Method used

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  • A preparation method of gh4169 alloy with uniform distribution of granular delta phase

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preparation example Construction

[0020] In a specific embodiment, the method for preparing a GH4169 alloy with a uniform distribution of granular δ phases of the present invention includes cold deformation and heat treatment of the GH4169 alloy, and the cold deformation and heat treatment include the following steps:

[0021] a) Firstly, the GH4169 sheet is subjected to solution treatment at 985°C±5°C for 1 hour to eliminate the residual stress, structure and phase inhomogeneity caused by the deformation history;

[0022] b) Carry out rolling deformation to the slab with a deformation amount of more than 30% (generally 40-70%), and pay attention to the cleaning of the slab and the lubricating effect of the roll during the deformation process;

[0023] c) Clean the slab after cold deformation with alcohol or acetone to remove the oil stain on the surface of the slab and prevent it from being severely oxidized during subsequent heat treatment;

[0024] d) Perform heat treatment on the cold deformed slab. The he...

Embodiment

[0028] The GH4169 sheet is subjected to solution treatment at 985°C for 1 hour to eliminate the residual stress, structure and phase inhomogeneity caused by the deformation history; the slab is subjected to rolling deformation with a deformation amount of 50%; the cold-rolled slab is used Wash with acetone to remove oil stains on the surface of the slab; heat-treat the cold-rolled slab, the heat treatment system is: 985°C for 1h, and quickly cool under the protection of vacuum argon; / h cooling to 620°C for 8h, rapid cooling under vacuum protection of argon.

[0029] Such as figure 1 As shown, from the scanning electron microscope of the GH4169 alloy, it can be seen that uniformly distributed granular δ phases are precipitated in the grain boundaries and intragranular structures of the alloy.

[0030] The results of the examples show that when the granular δ phase is evenly distributed in the alloy grain boundary and in the grain, the crack growth rate can be effectively redu...

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Abstract

The invention relates to a granular delta-phase uniformly distributed GH4169 alloy preparation method and belongs to the technical field of preparation of high-temperature alloy materials. On the basis of combination of cold deformation and heat treatment processes, the method includes GH4169 alloy cold deformation and heat treatment. Firstly, plate blanks are subjected to cold rolling deformation more than 30% after solid solution and quickly cooled under vacuum argon shielding after heat preservation at 985+ / 5 DEG C for 1h; secondly, the plate blanks are subjected to standard double aging treatment; finally, granular delta phases uniformly distributed in grains and at grain boundaries of GH4169 alloy are acquired. Therefore, GH4169 alloy strength is improved, and crack growth rate of the GH4169 alloy is decreased to acquire better fatigue performance.

Description

technical field [0001] The invention relates to a method for preparing a GH4169 alloy with evenly distributed granular delta phases, and belongs to the technical field of high-temperature alloy material preparation. Background technique [0002] Since the GH4169 alloy has high yield strength, tensile strength, durable strength and plasticity between -253 and 650 ° C, and has good corrosion resistance, radiation resistance, thermal processing and welding properties, it is widely used in aviation, aerospace, petroleum, etc. It has a wide range of uses in the fields of chemical, chemical and energy, and its consumption accounts for more than 45% of the world's total output of deformed superalloys. Therefore, the change of its microstructure and phase has always been the focus of research by scholars at home and abroad, especially the content, distribution and shape change of the δ phase in the alloy, which is a hot spot in the research. [0003] Studies have shown that δ has a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10
Inventor 张士宏程明叶能永宋鸿武
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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