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Cutting preparation method of nickel-based single-crystal alloy seed crystal for casting

A technology of nickel-based single crystal and seed crystal, which is applied in the field of precise directional cutting and preparation of seed crystal, can solve the problems of single crystal blade high-temperature service performance degradation and difficulty in obtaining blades, etc., and achieve simple cutting equipment, good repeatability, and seed crystal The effect of high crystal precision

Active Publication Date: 2015-08-19
成都航大新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the growth direction of the single crystal blade obtained by the spiral crystal selection method shows an obvious preferred orientation (generally along the direction of the temperature gradient: (001) direction), and the preferred orientation often has a certain off-angle with the axial direction, so that the single crystal blade The high temperature service performance is obviously reduced
Production practice shows that the reject rate of turbine blades directional solidified by the spiral crystal selection method due to the deviation from (001) exceeding 20° accounts for more than 30% of the production volume. In addition, it is difficult to obtain blades with an orientation of (111) by this method

Method used

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  • Cutting preparation method of nickel-based single-crystal alloy seed crystal for casting
  • Cutting preparation method of nickel-based single-crystal alloy seed crystal for casting
  • Cutting preparation method of nickel-based single-crystal alloy seed crystal for casting

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preparation example Construction

[0028] The method for cutting and preparing the nickel-based single crystal alloy seed crystal for casting provided by the present invention has the following specific steps:

[0029] In the first step, the test bar or plate used for preparing the seed crystal is machined to obtain a test block with upper and lower parallel sections, such as figure 1 As shown, cut the test bar or test plate along the dotted line to obtain a test block whose upper and lower surfaces are parallel. One of the parallel sections of the test block is polished to obtain a polished surface.

[0030] Polishing treatment conditions: use 60#, 180#, 400#, 800#, 1500# water-grinding sandpaper to polish one side of the parallel section of the test block in order to remove the processing residual stress on the surface.

[0031] In the second step, the test block is fixed on the X-ray stress measuring instrument (manufactured by Handan Est Stress Technology Application Co., Ltd. X-ray stress tester 350AC) ...

Embodiment 1

[0043] The first step is to perform wire cutting on the cuboid test plate to be made into (001) direction seed crystals to obtain a test block (28×27×27mm) with upper and lower parallel sections, and one of the parallel sections of the test block is sequentially Use 60#, 180#, 400#, 800#, 1500# water abrasive paper to polish to obtain a polished surface.

[0044] The second step, such as figure 2 Fix the stable part of the test block on the X-ray stress measuring instrument (produced by Handan Este Stress Technology Application Co., Ltd. with point rotation The center of the turntable of the X-ray stress tester-350AC) with the function of the connection mechanism of the corner, and use a fine marker pen to make an initial mark on the polished surface of the test block, and the mark is the same as same direction;

[0045] The third step is to confirm that the 2θ angle (X-ray diffraction angle) of the tested block material is set to 79.6° by consulting relevant literature (...

Embodiment 2

[0051] first step, such as figure 1 Carry out wire cutting on the cuboid test plate to be made into (111) direction seed crystals to obtain two test blocks (29×25×34mm) with parallel sections on the upper and lower sides, and use 60# for one of the parallel sections of the test blocks , 180#, 400#, 800#, 1500# water-grinding sandpaper to polish to obtain a polished surface.

[0052] The second step, such as figure 2 Fix the stable part of the test block on the X-ray stress measuring instrument (produced by Handan Este Stress Technology Application Co., Ltd. with point rotation X-ray Stress Measuring Apparatus-350AC) with the function of the connecting mechanism of the angle, the center of the turntable, the polished side facing up, and use a fine marker pen to make initial marks on the polished surface of the test block, and the X-ray Stress Measuring Apparatus same direction;

[0053] The third step is to set the 2θ angle of the X-ray stress measuring instrument to 68.7...

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Abstract

The invention discloses a cutting preparation method of a nickel-based single-crystal alloy seed crystal for casting. The cutting preparation method comprises the following steps of firstly machining a test rod or test plate which is used for preparing a seed crystal to obtain a test block with an upper parallel section and a lower parallel section, and carrying out polishing treatment on one of the parallel sections of the test block to obtain a polished surface; fixing the test block with the polished surface upward in the center of a rotating disc of an X-ray stress tester, marking a direction on the polished surface of the test block; determining an X-ray diffraction angle of a test block material, and scanning the psi angle and angle of the test block by utilizing the X-ray stress tester; carrying out the single-crystal directional cutting of the psi angle and an deflection angle by utilizing a wire cutting machine; finally preparing the seed crystal. The cutting preparation method disclosed by the invention has excessively low requirement on the orientation of an original single-crystal test rod, can directly obtain the seed crystal with orientational characteristics of (001), (011) and (111) through cutting and is low in processing cost. The seed crystal obtained through cutting has the advantages of high accuracy, good repeatability, high surface smoothness and no reprocessing.

Description

technical field [0001] The present invention relates to Ni base and Ni 3 The preparation method of the seed crystal precise directional cutting of Al-based single crystal superalloy casting, further said to make the Ni-based single crystal alloy with any orientation into (001), (011) or (111) crystallographic orientation by measuring and machining characteristic seeds. Background technique [0002] The key to improving the performance of aviation gas turbine engines is to improve the performance of service materials. The Ni-based single crystal turbine blade is a key component with the most technically difficult service conditions in the turbine engine, and the service requirements for its materials are extremely stringent. Due to the anisotropy of Ni single crystal alloys, turbine blades with (111) orientation along the axis will have higher and more stable high-temperature performance. The research shows that the fracture life of Ni-6.8Al-13.8Mo-6W alloy (111) crystal o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B11/14
Inventor 宫声凯尚勇李树索裴延玲沙江波徐惠彬
Owner 成都航大新材料有限公司
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