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Method for preparing and detecting plane strain sample of hard alpha inclusion material in titanium alloy

A technology of plane strain and detection method, which is applied in the preparation of test samples, analysis of materials, and the use of stable tension/pressure to test the strength of materials, etc., to achieve the effect of simple operation, wide range of use, and filling data gaps

Pending Publication Date: 2022-08-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in combination with the content of article 33.70 of the airworthiness regulations of aero-engines, it is necessary to first obtain the thermal deformation characteristic data of TiN inclusion materials, but the domestic data accumulation is blank, and it is urgent to carry out the thermal deformation characteristic test of TiN materials
However, since the TiN inclusion material is a non-metallic and non-ceramic substance, and it also has the characteristics of high hardness and high brittleness, the traditional sample processing methods and detection methods are not suitable for TiN materials. There is no corresponding preparation standard and detection standard for reference

Method used

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  • Method for preparing and detecting plane strain sample of hard alpha inclusion material in titanium alloy
  • Method for preparing and detecting plane strain sample of hard alpha inclusion material in titanium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, the preparation and detection method of a TiN material plane strain sample with a nitrogen content of 2wt% includes the following steps:

[0027] (1) TiN inclusion bulk materials with different nitrogen contents were prepared by hot isostatic pressing technology, and the nitrogen content was 2wt%;

[0028] (2) The plane strain sample is processed by wire cutting, the sample is a cube with a side length of 6.35mm, and the machining allowance is 0.5mm;

[0029] (3) Use an automatic grinding and polishing machine to grind the surface of the plane strain sample to remove the oxide layer;

[0030] (4) A solution with a volume ratio of hydrofluoric acid, nitric acid and water of 1:4:10 was used for etching treatment, and the concentrations of hydrofluoric acid and nitric acid were 36wt% and 67wt%, respectively, so as to prepare a plane strain with a nitrogen content of 2wt% sample;

[0031] (5) Use a high temperature thermal compression testing machine t...

Embodiment 2

[0034] In this embodiment, the preparation and detection method of a TiN material plane strain sample with a nitrogen content of 6wt% includes the following steps:

[0035] (1) TiN inclusion bulk materials with different nitrogen contents were prepared by hot isostatic pressing technology, and the nitrogen content was 6wt%;

[0036] (2) The plane strain sample is processed by wire cutting, the sample is a cube with a side length of 6.35mm, and the machining allowance is 0.3mm;

[0037] (3) Use an automatic grinding and polishing machine to grind the surface of the plane strain sample to remove the oxide layer;

[0038] (4) Then, a solution with a volume ratio of hydrofluoric acid, nitric acid and water of 2:8:10 was used for etching treatment, and the concentrations of hydrofluoric acid and nitric acid were 38wt% and 66wt%, respectively, so as to prepare a plane with a nitrogen content of 6wt% strain specimen;

[0039] (5) Use a high temperature thermal compression testing m...

Embodiment 3

[0042] In this embodiment, the preparation and detection method of a TiN material plane strain sample with a nitrogen content of 12wt% includes the following steps:

[0043] (1) TiN inclusion bulk materials with different nitrogen contents were prepared by hot isostatic pressing technology, and the nitrogen content was 12wt%;

[0044] (2) The plane strain sample is processed by wire cutting, the sample is a cube with a side length of 6.35mm, and the machining allowance is 0.4mm;

[0045] (3) Use an automatic grinding and polishing machine to grind the surface of the plane strain sample to remove the oxide layer;

[0046] (4) The plane strain samples were corroded with a solution with a volume ratio of hydrofluoric acid, nitric acid and water of 1:7:10. The concentrations of hydrofluoric acid and nitric acid were 37wt% and 65wt%, respectively, so that the nitrogen content was prepared as 12wt% plane strain specimen;

[0047] (5) Use a high temperature thermal compression test...

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Abstract

The invention relates to the field of titanium alloy material preparation, in particular to a preparation and detection method of a hard alpha inclusion material plane strain sample in a titanium alloy. The method comprises the following steps: (1) preparing TiN inclusion block materials with different nitrogen contents by adopting a hot isostatic pressing technology; (2) processing a cube plane strain sample by adopting a linear cutting mode; (3) preparing a plane strain sample of which the nitrogen content is lower than 12wt%; and (4) a high-temperature thermal compression testing machine is adopted for plane strain performance testing, the testing temperature is room temperature, and the strain rate is 0.01 S <-1 >-10 S <-1 >. Therefore, the thermal deformation characteristic data of the TiN materials with different nitrogen contents can be accurately detected, the key technology for preparing and detecting the plane strain sample of the TiN inclusion material is broken through, and the problem of'neck clamping 'of an autonomous airworthiness system in China is solved.

Description

technical field [0001] The invention relates to the field of titanium alloy material preparation, in particular to a preparation and detection method of a plane strain sample of a hard alpha inclusion material in a titanium alloy. Background technique [0002] Titanium is known as the "third metal" after steel and aluminum. Titanium and titanium alloys have good properties, such as: high specific strength, excellent corrosion resistance, high temperature resistance, non-magnetic, etc. It has been widely used in automobile, energy and other industries. Titanium alloys are usually prepared by hot forming. The chemical properties of titanium are active. During the process of alloy melting and hot forming, it will react with nitrogen in the air to form hard α inclusions. During the use of titanium alloy parts, hard α inclusions will become the source of cracks, shorten the service life of the parts, and cause major damage and loss to people's lives and properties. TiN inclusio...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32G01N3/04G01N3/18
CPCG01N1/286G01N1/32G01N3/18G01N3/04
Inventor 蔡雨升吉海宾杨兴远任德春雷家峰杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI