Method for observing TA7 titanium alloy metallographic structure

A technology of metallographic structure and titanium alloy, applied in the field of observation of metallographic structure of TA7 titanium alloy, can solve the problems of easy misjudgment, unclear metallographic structure, difficult to obtain clear structure, etc., and achieve the effect of easy operation.

Active Publication Date: 2014-07-23
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively solve the problem that it is difficult to obtain a clear structure of the existing TA7 titanium alloy metallographic sample, and avoid the shortcomings of the observed metallographic structure being unclear and prone to misjudgment due to improper polishing

Method used

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  • Method for observing TA7 titanium alloy metallographic structure
  • Method for observing TA7 titanium alloy metallographic structure
  • Method for observing TA7 titanium alloy metallographic structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1. Machining the TA7 titanium alloy into a metallographic observation plane, and then using the metallographic observation plane with a particle size of 150 in turn on the metallographic grinding machine # 、320 # 、400 # and 1000 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the metallographic water sandpaper is replaced to ensure that the last grinding trace is completely eliminated, and the sand grains on the metallographic observation plane are washed away after grinding;

[0032] Step 2. Place the metallographic observation plane where the sand grains have been washed out in step 1 on the polishing machine, and use Cr 2 o 3 solution and Al with a particle size of 5 μm 2 o 3 The powder is used as a polishing agent for mechanical polishing until there are no scratches and drags on the surface of the metallographic observation plane;

[0033] Step 3, immerse the mechanically polished metallog...

Embodiment 2

[0044] Step 1. Machining the TA7 titanium alloy into a metallographic observation plane, and then using the metallographic observation plane with a particle size of 150 in turn on the metallographic grinding machine # 、320 # 、400 # and 1000 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the metallographic water sandpaper is replaced to ensure that the last grinding trace is completely eliminated, and the sand grains on the metallographic observation plane are washed away after grinding;

[0045] Step 2. Place the metallographic observation plane where the sand grains have been washed out in step 1 on the polishing machine, and use Cr 2 o 3 solution and Al with a particle size of 5 μm 2 o 3 The powder is used as a polishing agent for mechanical polishing until there are no scratches and drags on the surface of the metallographic observation plane;

[0046] Step 3, immerse the mechanically polished metallog...

Embodiment 3

[0051] Step 1. Machining the TA7 titanium alloy into a metallographic observation plane, and then using the metallographic observation plane with a particle size of 150 in turn on the metallographic grinding machine # 、320 # 、400 # and 1000 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the metallographic water sandpaper is replaced to ensure that the last grinding trace is completely eliminated, and the sand grains on the metallographic observation plane are washed away after grinding;

[0052] Step 2. Place the metallographic observation plane where the sand grains have been washed out in step 1 on the polishing machine, and use Cr 2 o 3 solution and Al with a particle size of 5 μm 2 o 3 The powder is used as a polishing agent for mechanical polishing until there are no scratches and drags on the surface of the metallographic observation plane;

[0053] Step 3, immerse the mechanically polished metallog...

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Abstract

The invention discloses a method for observing a TA7 titanium alloy metallographic structure. The method comprises the following steps: machining TA7 titanium alloy to form a metallographic observation plane, grinding on a metallographic grinder, and washing sand grains after grinding; 2, mechanically polishing the metallographic observation plane; 3, immersing the metallographic observation plane in a corrosive solution for corroding; 4, with the metallographic observation plane as an anode, a stainless steel plate as a cathode and a sulfuric acid solution as electrolyte, performing anodic oxidation treatment on the metallographic observation plane; and 5, observing the metallographic structure under a metallographic microscope by adopting a polarization observation mode. According to the method, the problem that a clear structure is difficultly obtained in a conventional TA7 titanium alloy metallographic sample can be effectively solved, and the defects that the observed metallographic structure is not clear and misjudgment easily occurs due to improper polishing are overcome.

Description

technical field [0001] The invention belongs to the technical field of metallographic structure observation of metal materials, and in particular relates to a method for observing the metallographic structure of a TA7 titanium alloy. Background technique [0002] Titanium alloy has the characteristics of high strength and low density, good mechanical properties, good toughness and corrosion resistance. Therefore, titanium alloy is mainly used to make aircraft engine compressor components, followed by structural parts of rockets, missiles and high-speed aircraft. Due to the comprehensive excellent performance of titanium alloy, it can be widely used in high-precision equipment. In order to study the properties of titanium alloys, it is necessary to observe the microstructure of titanium alloys to determine the type of structure and its uniformity, so as to lay the foundation for improving the properties of titanium alloys. TA7 titanium alloy is a kind of titanium alloy, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/21G01N1/32
Inventor 王松茂白新房朱波夏金华马晓晨王涛胡涛涛李波
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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