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Grain size measuring method for equiaxial structure of two-phase titanium alloy

A technology of equiaxed structure and measurement method, which is applied in the field of determination of material microstructure structure, can solve the problem of no standard search for grain size, achieve the effects of compensating measurement errors, simplifying measurement, and improving accuracy

Inactive Publication Date: 2019-05-03
西安汉唐分析检测有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there is no standard for the grain size inspection of the equiaxed structure of titanium alloys at home and abroad.

Method used

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  • Grain size measuring method for equiaxial structure of two-phase titanium alloy
  • Grain size measuring method for equiaxial structure of two-phase titanium alloy
  • Grain size measuring method for equiaxial structure of two-phase titanium alloy

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Embodiment 1

[0026] The assay method of the present embodiment comprises the following steps:

[0027] Step 1. Select a magnification of 200× to prepare a metallographic photograph of the equiaxed structure of the two-phase titanium alloy, and then measure the percentage content Vvα=82% of the primary α grains in the equiaxed structure of the two-phase titanium alloy; the primary α grains Grains include spherical alpha grains;

[0028] Step 2. Take the circle as the measurement line, and calculate the average intercept of the primary α grains by using the intercept point method The specific process of the intercept point method with the circle as the measuring line is: add three circles with a diameter of 30 mm on the metallographic photograph prepared in step 1, so that the number of the three circles and the primary α crystal grains is greater than 50 cutoff point, such as figure 1 As shown, and then count the number N of primary α grains intersecting and tangent to the three circles ...

Embodiment 2

[0034] The assay method of the present embodiment comprises the following steps:

[0035] Step 1. Select a magnification of 200× to prepare a metallographic photograph of the equiaxed structure of the two-phase titanium alloy, and then measure the percentage of primary α grains in the equiaxed structure of the two-phase titanium alloy Vvα=70%; the primary α crystals Grains include spherical α grains and long α grains;

[0036] Step 2. Take the circle as the measurement line, and calculate the average intercept of the primary α grains by using the intercept point method The specific process of the intercept point method with the circle as the measuring line is: add three circles with a diameter of 30 mm on the metallographic photograph prepared in step 1, so that the number of the three circles and the primary α crystal grains is greater than 50 cutoff point, such as figure 2 As shown, and then count the number N of primary α grains intersecting and tangent to the three cir...

Embodiment 3

[0042] The assay method of the present embodiment comprises the following steps:

[0043] Step 1. Select a magnification of 500× to prepare a metallographic photograph of the equiaxed structure of the TC11 forging, and then measure the percentage of primary α grains in the equiaxed structure of the TC11 forging Vvα=45%; the primary α grains include spherical α grains and long α grains;

[0044] Step 2, take three straight lines with different directions as the measurement lines, and calculate the average intercept l of the primary α grains by the intercept method; the specific process of the intercept method with the three straight lines as the measurement lines is: in step one Three straight lines with different directions are added to the prepared metallographic photo, with lengths of 117 μm, 166 μm, and 118 μm, respectively, so that the three straight lines have more than 50 intercept points with the primary α grains, as shown in image 3 Shown, and then count the number N o...

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Abstract

The invention discloses a grain size measuring method for an equiaxial structure of two-phase titanium alloy. The method comprises that 1) a metallurgical phase photo of the equiaxial structure of thetwo-phase titanium alloy is prepared by selecting an appropriate amplification multiple, and the percent content Vvalpha of primary alpha crystal grains is measured; 2) a circle or three straight lines in different directions serve(s) as a measuring line, and the average intercept l of the primary alpha crystal grains is obtained in a resection method; and 3) the grain size level index G alpha ofthe equiaxial structure of the two-phase titanium alloy is calculated according to the average intercept l of the primary alpha crystal grains. Thus, determination of the grain size of the equiaxialstructure is simplified, and the accuracy of the determination method is improved.

Description

technical field [0001] The invention belongs to the technical field of measuring the microstructure of materials, and in particular relates to a method for measuring the grain size of the equiaxed structure of a two-phase titanium alloy. Background technique [0002] Due to its high specific strength, excellent corrosion resistance, good biocompatibility and other advantages, titanium alloy has rapidly developed into a new type of key structural material, and is widely used in aerospace, military industry, petrochemical industry and medical and health and other fields. [0003] Titanium alloy ingots are mostly smelted by vacuum consumable arc. During smelting, the temperature of the molten pool is high, the degree of superheat is large, the crystal grains are coarse after solidification, and the comprehensive performance of the ingot is poor. The grain size has an important influence on the properties of materials, especially in terms of plasticity, strength and high temper...

Claims

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Application Information

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IPC IPC(8): G01N15/02
Inventor 马红征翟通德何伟白新房王松茂武晶晶
Owner 西安汉唐分析检测有限公司
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