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Method for displaying grain size of titanium alloy

A grain size display, titanium alloy technology, applied in the use of wave/particle radiation for material analysis, measuring devices, instruments, etc., can solve the problem that the grain size cannot be displayed, and achieve a clearly visible effect

Pending Publication Date: 2022-02-25
CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the conventional hydrofluoric acid and nitric acid aqueous solution can only corrode the β-state titanium alloy grains, and can only corrode the structure of the bidirectional titanium alloy and the near-β-state titanium alloy, but cannot display its grain size (such as figure 1 shown)

Method used

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  • Method for displaying grain size of titanium alloy
  • Method for displaying grain size of titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for displaying the grain size of a titanium alloy, comprising the following steps:

[0027] Step S1: Sampling, cutting and sampling the titanium alloy TC4 to be tested to obtain a sample;

[0028] Step S2: Grinding and polishing, grinding and polishing the sample; Grinding includes rough grinding and fine grinding; rough grinding uses 320# silicon carbide sandpaper for the first rough grinding until the cutting marks on the surface to be inspected completely disappear; use 500 #Silicon carbide sandpaper is used for the second rough grinding until the first grinding mark disappears completely; fine grinding is carried out twice with 800# and 1000# silicon carbide sandpaper until the last grinding mark disappears completely; polishing is done with aluminum oxide The suspension is polished until the fine grinding marks have completely disappeared.

[0029] Step S3: Scratch inspection. After cleaning and drying the polished sample in step S2, use a Leica STP6000 o...

Embodiment 2

[0034] A method for displaying the grain size of a titanium alloy, comprising the following steps:

[0035] Step S1: Sampling, cutting and sampling the titanium alloy TC4 to be tested to obtain a sample;

[0036] Step S2: Grinding and polishing, grinding and polishing the sample; Grinding includes rough grinding and fine grinding; rough grinding uses 320# silicon carbide sandpaper for the first rough grinding until the cutting marks on the surface to be inspected completely disappear; use 500 #Silicon carbide sandpaper is used for the second rough grinding until the first grinding mark disappears completely; fine grinding is carried out twice with 800# and 1000# silicon carbide sandpaper until the last grinding mark disappears completely; polishing is done with aluminum oxide The suspension is polished until the fine grinding marks have completely disappeared.

[0037] Step S3: Scratch inspection. After cleaning and drying the polished sample in step S2, use a Leica STP6000 o...

Embodiment 3

[0042] A method for displaying the grain size of a titanium alloy, comprising the following steps:

[0043] Step S1: Sampling, cutting and sampling the titanium alloy TC4 to be tested to obtain a sample;

[0044]Step S2: Grinding and polishing, grinding and polishing the sample; Grinding includes rough grinding and fine grinding; rough grinding uses 320# silicon carbide sandpaper for the first rough grinding until the cutting marks on the surface to be inspected completely disappear; use 500 #Silicon carbide sandpaper is used for the second rough grinding until the first grinding mark disappears completely; fine grinding is carried out twice with 800# and 1000# silicon carbide sandpaper until the last grinding mark disappears completely; polishing is done with aluminum oxide The suspension is polished until the fine grinding marks have completely disappeared.

[0045] Step S3: Scratch inspection. After cleaning and drying the polished sample in step S2, use a Leica STP6000 op...

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Abstract

The invention discloses a method for displaying the grain size of titanium alloy. The method comprises the following steps: S1, sampling; S2, grinding and polishing; S3, performing scratch inspection: observing whether the sample has scratches or not under a microscope, and repeating the step S2 if the sample has the scratches; S4, conducting electrolytic polishing, specifically, subjecting the sample to electrolytic polishing, and preparing an adopted electrolyte from 850 ml to 1200 ml of acetic acid and 65 ml to 80 ml of perchloric acid, wherein the polishing voltage is 38 to 45 V; after electrolytic polishing, observing whether the surface of the sample is burnt or not, and if yes, repeating the step S2 and the step S3; S5, carrying out electron microscope observation; and S6, carrying out image scanning: carrying out grain size display scanning on the sample by using an EBSD probe attached to a scanning electron microscope. According to the method, after a sample is ground and polished, an electrolyte of acetic acid and perchloric acid is adopted, the polishing voltage is controlled for electrolytic polishing, meanwhile, a proper diaphragm is selected, and parameters such as the voltage, the observation angle and the working distance during electron microscope observation are adjusted and controlled, so that titanium alloy crystal grains can be displayed clearly and visually.

Description

technical field [0001] The invention belongs to the technical field of material microstructural structure measurement, and in particular relates to a method for displaying the grain size of titanium alloy. Background technique [0002] The grain size indicates the scale of the grain size, which can be expressed by the average area or average diameter of the grains. The grain size has a decisive influence on the mechanical properties of metals such as tensile strength, toughness, and plasticity. Therefore, grain size detection is of great significance in metallographic analysis. [0003] Titanium alloy (TC4) is widely used in aerospace, and its original grain size has a great influence on the subsequent structure. At present, the conventional hydrofluoric acid and nitric acid aqueous solution can only corrode the β-state titanium alloy grains, and can only corrode the structure of the bidirectional titanium alloy and the near-β-state titanium alloy, but cannot display its g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2251G01N23/2202G01N23/203G01N23/20008
CPCG01N23/2251G01N23/2202G01N23/203G01N23/20008
Inventor 熊勇杨玉川李永斌陈昌达汤浩慧畅古鸣
Owner CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD
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