High-temperature alloy with gradient nanostructure surface layer and preparation method of high-temperature alloy

A high-temperature alloy and nanostructure technology, which is applied in the field of nanometerization of the surface of metal materials, can solve the problems of insufficient mechanical properties, uneven microstructure, and coarse grains on the surface layer, and achieves high mechanical properties, large hardness gradient, and simple processing. Effect

Active Publication Date: 2021-04-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In order to solve the problems of superalloys with coarse surface grains, uneven microstructure, and insufficient mechanical properties, the inventi

Method used

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  • High-temperature alloy with gradient nanostructure surface layer and preparation method of high-temperature alloy
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  • High-temperature alloy with gradient nanostructure surface layer and preparation method of high-temperature alloy

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preparation example Construction

[0035] The method for preparing a superalloy with a surface layer of a gradient nanostructure comprises the following steps: processing the superalloy with surface mechanical grinding technology, pressing a processing tool into the surface of the material to a certain depth, and passing the spherical head at the front end of the processing tool to Grinding produces gradient plastic deformation on the surface of the material. The superalloy treatment is completed on the surface nano-processing system, such as figure 1 As shown, the processing system includes a rotating system 1 , a tool holder feeding system 2 , a processing tool 3 and a cooling system 4 . The rotating system 1 and the tool post feeding system 2 are realized by a numerically controlled lathe, which provide rotary motion and feeding motion respectively; the processing tool 3 is installed on the tool post feeding system 2, and the front end is equipped with a spherical head with a certain radius of curvature ; T...

Embodiment 1

[0041] Process J75 iron-based superalloy parts with a diameter of 13mm, its chemical composition is (wt.%): Ni 30.8%, Cr14.87%, Mo 1.31%, V 0.24%, Ti 1.88%, Al 0.36%, Si 0.19% , B 0.0008%, the balance of Fe; the heat treatment state is a solid solution state.

[0042] Using the present invention to carry out surface nano-processing, the material of the spherical head at the front end of the processing tool is hard alloy, and the radius of curvature is 4mm. Speed ​​V of J75 iron-based high-temperature alloy parts 1 =300r / min; the feed speed V of the processing tool 2 =9mm / min; each pressing amount of the processing tool a p =20um, the processing pass is 6 times; oily cutting fluid is used for cooling and lubrication during processing.

[0043] The test results show that after surface nano-treatment, a gradient structure layer about 500um thick is formed on the surface of J75 iron-based superalloy parts, in which the thickness of the nanocrystalline layer is 60μm, the thickne...

Embodiment 2

[0045] Process Inconel718 nickel-based superalloy parts with a diameter of 14mm, its chemical composition is (wt.%): Fe19.1%, Cr 17.91%, Mo 3.01%, Nb 5.32%, Ti 0.96%, Al 0.45%, C 0.026% , Ni balance; the heat treatment state is a solid solution state.

[0046] Using the present invention to carry out surface nano-processing, the material of the spherical head at the front end of the processing tool is hard alloy, and the radius of curvature is 4mm. Speed ​​V of solid solution Inconel718 nickel-based superalloy parts 1 =500r / min; the feed speed V of the processing tool 2 =8mm / min; each pressing amount of the processing tool a p =20um, the processing pass is 6 times; oily cutting fluid is used for cooling and lubrication during processing.

[0047] The test results show that after surface nano-treatment, a gradient structure layer about 350um thick is formed on the surface of the solid solution state Inconel718 nickel-based superalloy parts, in which the thickness of the nano...

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Abstract

The invention discloses a high-temperature alloy with a gradient nanostructure surface layer and a preparation method of the high-temperature alloy, and belongs to the technical field of metal material surface nanocrystallization. The high-temperature alloy is treated through surface mechanical grinding technology, a spherical head is pressed into the surface of a material by a certain depth for grinding, gradient plastic deformation is generated on the surface layer of the material, a gradient organization structure for transition from nano-crystalline grains to micron-crystalline grains is formed on the surface of the high-temperature alloy, and a large hardness gradient is generated from outside to inside, so that the problems of coarse surface grains, uneven microstructure, insufficient mechanical properties and the like of the high-temperature alloy are solved. The high-temperature alloy with the gradient nanostructure surface layer and the preparation method of the high-temperature alloy have the characteristics of being simple in treatment, low in energy consumption, and suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of metal material surface nanometerization, and in particular relates to a high-temperature alloy with a gradient nanostructure surface layer and a preparation method thereof. Background technique [0002] Since the 20th century, aviation technology has gradually matured, and the development of aero-engines has provided an important impetus. Superalloys, which are important metal materials for aero-engines, have developed rapidly. Because superalloys have high temperature resistance, oxidation resistance, and The performance characteristics of corrosion have been applied in many fields such as gas turbines, automobile engines, and nuclear power. Superalloys can be divided according to the type of matrix elements: 1) Iron-based superalloys: Iron-based superalloys use Fe as the matrix, add Ni to stabilize the austenite structure, and use Cr to improve the oxidation resistance and corrosion resistance of the al...

Claims

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Application Information

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IPC IPC(8): C21D7/04
CPCC21D7/04C21D2201/00
Inventor 梁晨张宝兵李秀艳卢柯唐赢广
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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