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Method for preparing large-scale titanium and titanium alloy metallographic samples

A technology for metallographic samples and titanium alloys, which is applied in the field of metallographic sample preparation of titanium and titanium alloys, and achieves the effects of high magnification and clear structure, solving preparation difficulties and complete grain boundaries.

Active Publication Date: 2015-09-02
西安赛特思迈钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing large-scale titanium and titanium alloy metallographic samples, which solves the problem in the prior art that samples need to be prepared separately for large-scale titanium alloy metallographic high-magnification and low-magnification structures

Method used

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  • Method for preparing large-scale titanium and titanium alloy metallographic samples
  • Method for preparing large-scale titanium and titanium alloy metallographic samples
  • Method for preparing large-scale titanium and titanium alloy metallographic samples

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preparation example Construction

[0026] The method for preparing large-scale titanium and titanium alloy metallographic samples includes the steps of sampling, grinding, polishing, cleaning, corrosion, drying and structure observation.

[0027] Sampling is to use a sawing machine to cut a 10-20mm titanium or titanium alloy thin slice sample;

[0028] Polishing is to fix the sawed sample and use a hand-held angle grinder to polish its surface; specifically, fix the sawed sample and use an angle grinder to grind its surface until it is removed. The damage layer caused by sawing; the angle grinder includes a body and a grinding wheel arranged on the body, and the body is also provided with a handle, a motor and a switch. The grinding wheel is a PVA wheel. The advantages of PVA wheels are: PVA is a self-consumable material, which will not damage the metal substrate during the grinding process; the heat generated during the grinding process is small, and will not cause tissue changes on the surface of the sample ...

Embodiment 1

[0040] For the TC4 titanium alloy □120mm square material that has been forged twice, use a sawing machine to cut a 10-20mm thin slice sample, and polish the sawed sample with an angle grinder (installed with a PVA polishing wheel) until it is removed. The damaged layer caused by sawing; then use a vertical polishing machine to perform mechanical polishing until the surface is bright and close to the mirror surface; then the surface is cleaned, corroded, and dried. At this time, the low-magnification metallographic structure of the sample can be observed; the clear high-magnification microstructure can be observed using a metallographic microscope, such as image 3 (100х), Figure 4 (200х), typical Widmanite structure.

Embodiment 2

[0042] The TC4 titanium alloy Φ120mm round bar that has been piered three times is cut into 10-20mm thin slices with a sawing machine, and the sawed sample is polished with an angle grinder (installed with a PVA polishing wheel) until the sawing is removed. The damaged layer; then use a vertical polishing machine to perform mechanical polishing until the surface is bright and close to the mirror surface; then the surface is cleaned, corroded, and dried. At this time, the low-magnification metallographic structure of the sample can be observed; the clear high-magnification microstructure can be observed using a metallographic microscope, such as Figure 5 (100х), Image 6 As shown in (200х), it is an equiaxed α+β processed structure.

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Abstract

The invention discloses preparation methods of large-size titanium and titanium alloy metallographic. The preparation method comprises the steps of sampling, grinding, polishing, cleaning, corroding, drying and texture observing, wherein the sampling is as follows: 10-20mm titanium or titanium alloy sheet specimens are sawn by utilizing a sawing machine, the grinding: the sawn specimens are fixed, the surfaces of the specimens are ground by utilizing an angular finishing grinder with PVA (Polyvinyl Acetate) wheels; and the polishing: the ground specimens are mechanically polished by using a vertical polishing machine until the surfaces are bright. The preparation method can be used for solving the problem that high and low power specimens of large-size titanium alloy metallographic samples need to be prepared separately, and solving the problem that the low power metallographic samples with special-shaped sections are difficult to prepare. After the metallographic specimens prepared by the preparation method is corroded, a macrostructure is clean and clear, and cracks, air holes, metal or nonmetal inclusions and other visible defects can be observed; a microstructure is clear and has a complete grain boundary, and the observation cannot be affected by foreign matters in a single grain.

Description

technical field [0001] The invention belongs to the technical field of titanium and titanium alloy metallographic sample preparation, and relates to a cross-sectional area S 2 ≥1926mm 2 , that is, the preparation method of large-scale titanium and titanium alloy metallographic samples of Φ50mm round material or square material with a side length of 45mm. Background technique [0002] The metallographic sample preparation of titanium and titanium alloys is more difficult than that of steel, and its grinding and polishing efficiency is very low. The traditional methods for preparing metallographic samples of titanium and titanium alloys are: sampling→mounting→polishing→polishing→corroding with corrosive solution→photographing with a metallographic microscope. Due to the small processing range of equipment used in traditional methods such as mosaic machines, pre-grinding machines and polishing machines, the cross-sectional area S 2 ≥1926mm 2 Large-scale titanium and titaniu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/32
Inventor 王海樊亚军陈志宏曹继敏杨华斌魏芬绒崔文俊李雷
Owner 西安赛特思迈钛业有限公司
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