Treatment method of high-temperature alloy EBSD test sample

A high-temperature alloy and processing method technology, which is applied in the field of processing high-temperature alloy EBSD test samples, can solve problems such as long cycle time, difficult EBSD test sample preparation, and complicated procedures, so as to improve efficiency, save repetitive work, and improve accuracy and reliability effects

Pending Publication Date: 2022-04-12
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the superalloy sample is mechanically polished and chemically etched, and the average value of the dendrite spacing in the test surface of the sample is obtained to determine the EBSD test step length, and the defect position is marked at the same time, and then the acid corrosion layer is removed and the stress is relieved Corrosion, using the strong oxidizing property of the corrosive solution to effectively remove the surface stress of the superalloy sample, and solve the problems of difficult sample preparation, complicated process and long cycle for the EBSD test of the superalloy, with the characteristics of simplicity, practicality and high efficiency

Method used

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  • Treatment method of high-temperature alloy EBSD test sample

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Embodiment 1

[0033] This embodiment includes the following steps:

[0034] Step 1. Mechanical grinding: The first generation single crystal superalloy DD403 sample is subjected to rough grinding, fine grinding and mechanical polishing in sequence. The first generation single crystal superalloy DD403 is composed of the following components by mass: Cr 9.5% , Co5.0%, Mo 3.8%, W 5.2%, Al 5.9%, Ti 2.1%, the balance is Ni, the specific process is as follows:

[0035] Step 101, adopt 600 # The surface of the first-generation single-crystal superalloy DD403 sample is roughly ground with sandpaper until the surface of the first-generation single-crystal superalloy DD403 sample is smooth and free of dents;

[0036] Step 102, adopt 800 in turn # , 1000 # , 1500 # , 1800 # , 2000 # The first-generation single crystal superalloy DD403 sample after rough grinding in step 101 is finely ground with sandpaper until there are no visible scratches;

[0037] Step 103: Assemble the navy cloth polishing...

Embodiment 2

[0042] This embodiment includes the following steps:

[0043] Step 1. Mechanical grinding: The second-generation single crystal superalloy DD6 sample is subjected to rough grinding, fine grinding and mechanical polishing in sequence. The second-generation single crystal superalloy DD6 is composed of the following components in mass percentage: Cr 4.3% , Co 9.0%, Mo 2.0%, W 8.0%, Ta 7.5%, Re 2.0%, Nb 0.5%, Al 5.6%, Hf 0.1%, C 0.006%, the balance is Ni, the specific process is as follows:

[0044] Step 101, use 800 # The surface of the second-generation single crystal superalloy DD6 sample is roughly polished with sandpaper until the surface of the second-generation single crystal superalloy DD6 sample is smooth and free of dents;

[0045] Step 102, adopt 1000 in turn # , 1500 # , 1800 # , 2000 # , 2500 # The second-generation single crystal superalloy DD6 sample after rough grinding in step 101 is finely ground with sandpaper until there are no visible scratches;

[0046...

Embodiment 3

[0051] This embodiment includes the following steps:

[0052] Step 1. Mechanical grinding: Rough grinding, fine grinding and mechanical polishing are performed on the third-generation single crystal superalloy DD33 sample in turn. The third-generation single crystal superalloy DD33 sample is composed of the following components in mass percentage: Cr 2.5%, Co9.0%, Mo 1.5%, W 6.0%, Ta 8.0%, Re 4.0%, Al 6.0%, Ti 0.2%, C 0.02%, Hf0.001%, the balance is Ni, the specific process is as follows:

[0053] Step 101, adopt 1000 # The surface of the third-generation single crystal superalloy DD33 sample is roughly ground with sandpaper until the surface of the third-generation single crystal superalloy DD33 sample is smooth and free of pits;

[0054] Step 102, adopt 1000 in turn # , 1500 # , 1800 # , 2000 # The third-generation single crystal superalloy DD33 sample after rough grinding in step 101 is finely ground with sandpaper until there are no visible scratches;

[0055] Step 1...

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Abstract

The invention discloses a treatment method of a high-temperature alloy EBSD test sample. The method comprises the following steps: 1, mechanical grinding: sequentially carrying out coarse grinding, fine grinding and mechanical polishing on the high-temperature alloy sample; 2, carrying out metallographic photographing and picture splicing after chemical corrosion, determining the position of a defect, carrying out marking treatment, and calculating to obtain an average value of dendritic crystal spacing in the test surface; and thirdly, fine grinding and mechanical polishing are repeated in sequence to remove the acid corrosion layer, then stress removal corrosion is conducted, and the high-temperature alloy EBSD test sample is obtained. According to the method, the high-temperature alloy sample is mechanically polished and then subjected to chemical corrosion, the average value of the dendritic crystal spacing in the test surface of the sample is obtained to determine the EBSD test step length, then an acid corrosion layer is removed, stress relief corrosion is conducted, and the surface stress of the high-temperature alloy sample is effectively removed through the strong oxidizing property of corrosive liquid; the problems that high-temperature alloy EBSD test sample preparation is difficult, the working procedure is complex and the period is long are solved, and the method has the advantages of being simple, practical and efficient.

Description

technical field [0001] The invention belongs to the field of sample preparation, and in particular relates to a processing method of a high-temperature alloy EBSD test sample. Background technique [0002] In the process of preparing superalloy single crystal blades by directional solidification, due to factors such as alloy composition, blade structure, process parameters and melt flow, small-angle grain boundaries, large-angle grain boundaries, miscellaneous crystals, freckles, and broken arm crystals will locally appear in the single crystal blade. In order to further study the formation mechanism and influencing factors of these defects, microstructure analysis and EBSD orientation determination of defect positions are required. [0003] Before the EBSD test, the surface of the sample needs to be destressed to achieve the purpose of accurate test results and high calibration rate. The current treatment methods mainly use electrolytic polishing or vibration polishing. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/20008G01N23/203G01N1/32G01N1/28
Inventor 霍苗张可人雒设计
Owner XI'AN PETROLEUM UNIVERSITY
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