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A superalloy with gradient nanostructure surface layer and its preparation method

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

Active Publication Date: 2022-02-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 invention provides a superalloy with a gradient nanostructure surface layer and its preparation method, which is prepared by surface mechanical grinding technology

Method used

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  • A superalloy with gradient nanostructure surface layer and its preparation method
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  • A superalloy with gradient nanostructure surface layer and its preparation method

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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 thereof, belonging to the technical field of nanometerization of the surface of metal materials. The surface mechanical grinding technology is used to process the superalloy, and the spherical head is pressed into the surface of the material to a certain depth for grinding, so that the surface layer of the material produces gradient plastic deformation, and the surface of the superalloy forms a gradient structure from nano-grains to micro-grains. The structure produces a large hardness gradient from the surface to the inside, which solves the problems of superalloys such as coarse grains on the surface, uneven microstructure, and insufficient mechanical properties. The invention has the characteristics of simple processing, low energy consumption, suitable for industrial application and the like.

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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Patent Type & Authority Patents(China)
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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