A method of cutting and preparing cast single crystal superalloy seed crystal

A high-temperature alloy, single crystal technology, applied in the direction of manufacturing tools, stone processing equipment, fine working devices, etc., can solve the problems of complex equipment and high cost

Active Publication Date: 2022-04-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the disadvantages of complex and expensive equipment for cutting and casting single crystal superalloy seed crystals in the prior art, the present invention proposes a method for cutting and preparing cast single crystal superalloy seed crystals

Method used

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  • A method of cutting and preparing cast single crystal superalloy seed crystal
  • A method of cutting and preparing cast single crystal superalloy seed crystal
  • A method of cutting and preparing cast single crystal superalloy seed crystal

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Effect test

Embodiment 1

[0045] In this embodiment, a seed crystal with a diameter of 7 mm, a length of 20 mm, and a crystallographic orientation characteristic of [001] is cut.

[0046] The single crystal test rod used was cut from the nickel-based single crystal superalloy rod. The single crystal test rod has a diameter of 15 mm and a length of 30 mm.

[0047] The concrete process of this embodiment is:

[0048] Step 1, make a primary marking line parallel to the secondary dendrite direction

[0049] A standard metallographic preparation method is used to grind and polish one end face 1 of the single crystal test bar, and perform metallographic chemical corrosion on the end face.

[0050] Polishing treatment conditions: use 80#, 400#, 600#, 800#, 1000#, 1500#, 2000# water abrasive paper to polish one end surface of the single crystal test rod, and then perform polishing treatment on a polishing machine. The end face of the polished single crystal test rod is etched; the proportion of the etchant ...

Embodiment 2

[0067] In this embodiment, a seed crystal with a diameter of 10 mm, a length of 15 mm, and a [011] crystallographic orientation is cut.

[0068] The single crystal test rod used was cut from the cobalt-based single crystal superalloy rod. The single crystal sample used is φ15mm in diameter and 35mm in length. The concrete process of this embodiment is:

[0069] Step 1, make a primary marking line parallel to the secondary dendrite direction

[0070] One end face 1 of the single crystal test bar was ground and polished using standard metallographic preparation procedures. The end face is subjected to metallographic chemical etching. Polishing treatment conditions: Use 80#, 400#, 600#, 800#, 1000#, 1500#, 2000# water abrasive paper to polish one end face of the single crystal test rod, and then perform polishing treatment on a polishing machine. Carry out corrosion treatment to the polished end face; The etchant of described corrosion treatment matter is made of 4gCuSO 4 , ...

Embodiment 3

[0088] In this embodiment, a seed crystal with a diameter of 8 mm, a length of 12 mm, and a [111] crystallographic orientation is cut.

[0089] from Ni 3 Al-based single crystal superalloy rods used for intercepting single crystal test rods. The single crystal sample used is φ20mm in diameter and 40mm in length.

[0090] The concrete process of this embodiment is:

[0091] Step 1, make a primary marking line parallel to the secondary dendrite direction

[0092] One end face 1 of the single crystal test bar was ground and polished using standard metallographic preparation procedures. Use 80#, 400#, 600#, 800#, 1000#, 1500#, 2000# water-grinding sandpaper to polish one end face of the single crystal test rod in turn, and perform polishing on a polishing machine. Perform metallographic chemical etching on the polished end faces; the etchant used consists of 4gCuSO 4 , 20ml HCl, 20mlH 2 O prepared; corrosion 20s. After the end surface is corroded, a regular "ten" pattern ap...

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Abstract

A method for cutting and preparing cast single crystal superalloy seed crystals. Based on the strict correspondence between the growth direction of single crystals and crystal directions, the directions of primary dendrites and secondary dendrites are precisely cut and calibrated, and standard dendrites are constructed based on the dendrite directions. The FCC crystal structure can cut out the (001) crystal plane of the single crystal test rod, and then use the crystal plane angle formula of the FCC crystal to calculate the angle θ between the target crystal plane and the (001) crystal plane, and according to the FCC crystal structure Features Mark the intersection line between the target crystal plane and the (001) crystal plane on the (001) crystal plane, and cut out the target crystal plane along the intersection line with an angle of θ with the (001) crystal plane; cut perpendicular to the target crystal plane A seed crystal with the target orientation is obtained. The invention adopts metallographic observation and directional cutting to directly cut seed crystals with any crystal orientation on cast single crystal test rods, has simple equipment and operation steps, and the orientation deviation of cut out seed crystals is less than 5°.

Description

technical field [0001] The invention relates to a method for directional cutting of a cast single crystal superalloy seed crystal, in particular to a method for making a cast single crystal superalloy into a seed with crystallographic orientation characteristics of [001], [011] or [111] through metallographic observation and directional cutting crystal. Background technique [0002] Single crystal superalloys are widely used in hot-end components such as turbine blades of advanced aero-engines due to their excellent high-temperature properties. The mechanical properties of single crystal superalloys have significant anisotropy. Although single crystal blades with [001] orientation in the axial direction are mostly used in industry, the irregular external shape of the turbine blades and the complex air-cooling channels inside, as well as the service process The relatively high temperature gradient in the turbine blade produces local multiaxial mechanical stress and thermal s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28D5/04
CPCB28D5/045
Inventor 杨文超屈鹏飞刘林张军黄太文苏海军郭敏郭跃岭
Owner NORTHWESTERN POLYTECHNICAL UNIV
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