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Method for measuring grain size of two-phase titanium alloy basket-weave microstructure

A technology of mesh basket organization and measurement method, which is applied in the direction of measurement device, particle size analysis, particle and sedimentation analysis, etc., can solve the problems of unobservable, inability to measure β grains, and no standard for grain size inspection. The effect of improving accuracy

Inactive Publication Date: 2019-04-12
西安汉唐分析检测有限公司
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  • Application Information

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Problems solved by technology

The grain size of the basket structure of titanium alloy is usually measured by the grain size of the β phase, but because the grain boundary of the β grains has been broken, the original β grains cannot be observed in the structure, so the β grains cannot be measured, and it is necessary to establish Measuring method of β grain of basket structure
[0006] At present, there is no standard for the grain size inspection of the basket structure of titanium alloy at home and abroad.

Method used

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  • Method for measuring grain size of two-phase titanium alloy basket-weave microstructure
  • Method for measuring grain size of two-phase titanium alloy basket-weave microstructure
  • Method for measuring grain size of two-phase titanium alloy basket-weave microstructure

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Embodiment 1

[0022] The measurement method of this example is: According to GB / T23605-2009 "Measurement Method for Beta Transformation Temperature of Titanium Alloys", the temperature of the β transformation point of the TC11 forging is measured as 1005°C, and the TC11 forging is heated at 990°C for 20 minutes and then air-cooled to obtain After heat treatment, the TC11 forging is measured by the intercept method in GB / T6394-2017, and the grain size of the β phase of the two-phase titanium alloy after heat treatment is 7.5, which is recorded as the initial β grain size G qβ , then the grain size grade index G of the two-phase titanium alloy basket structure qβ It is grade 7.5.

[0023] figure 1 It is the metallographic structure diagram (200×) of the TC11 forging of the present embodiment, from figure 1 It can be seen that the organizational characteristics of TC11 forgings are cross-woven strips α, which is a typical basket structure.

[0024] figure 2 It is the metallographic struct...

Embodiment 2

[0026] The determination method of this embodiment includes the following steps: according to GB / T23605-2009 "Measurement Method for Beta Transformation Temperature of Titanium Alloys", the temperature of the β transformation point of the TC6 forging is measured as 995°C, and the TC6 forging is heated at 985°C for 20 minutes and then air-cooled , to obtain the TC6 forging after heat treatment, and then grind and polish one surface of the TC6 forging after heat treatment, then place the polished surface upwards at 980 ° C for 40 minutes, then water quench, and then use fine sandpaper to form an angle of 15° on the oxide layer Grinding is carried out to obtain the metallographic structure of the oxide layer and the transition area of ​​the grinding surface, and the grain size of the β phase in the metallographic structure of the oxide layer and the grinding surface transition area is measured by the intercept method in GB / T6394-2017. Grade 6.0, and recorded as the initial β grain...

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Abstract

The invention discloses a method for measuring grain size of a two-phase titanium alloy basket-weave microstructure. The method for measuring the grain size of the two-phase titanium alloy basket-weave microstructure comprises the following steps that a two-phase titanium alloy is heated at 10 DEG C or 15 DEG C below the beta phase transformation point temperature of the two-phase titanium alloy,the temperature is kept for 20 minutes, then air cooling is carried out, then a method in GB / T6394-2017 is used for performing measuring, the grain size grade index of a beta phase of the heat-treatedtwo-phase titanium alloy is obtained, an initial beta grain size G<q[beta]> grade index is recorded to be used as the grain size of the two-phase titanium alloy basket-weave microstructure. Accordingto the method for measuring the grain size of the two-phase titanium alloy basket-weave microstructure, the two-phase titanium alloy is subjected to heat treatment at 10 DEG C or 15 DEG C below the beta phase transformation point temperature, so that an alpha sheet shows original beta grains again, and then the original beta grains are utilized to measure the grain size of the basket-weave microstructure in the two-phase titanium alloy, the problems that only the grain size measuring can be carried out on the structure with an original beta trace and no method measurement can be carried out on the broken structure on the grain boundary part of the original beta grains in the prior art are solved, and the method for measuring the grain size of the two-phase titanium alloy basket-weave microstructure is provided.

Description

technical field [0001] The invention belongs to the technical field of material microstructure measurement, and in particular relates to a method for measuring the grain size of a two-phase titanium alloy basket structure. 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 temperature propertie...

Claims

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Application Information

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IPC IPC(8): G01N15/02
CPCG01N15/02G01N15/0205
Inventor 马红征杨军红白新房何伟王松茂武晶晶
Owner 西安汉唐分析检测有限公司
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