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Corrosive for displaying heat-resistant steel original austenite grain-boundary and displaying method thereof

A technology of austenite grain boundaries and heat-resistant steel, which is applied in the preparation of test samples, test crystals, and measuring devices, and can solve problems such as unfavorable large-scale industrial applications, complicated operation of display methods, and unclear display of grain boundaries. , to achieve the effect of simple and convenient preparation process, simple and convenient operation, and good corrosion effect

Active Publication Date: 2019-01-11
TIANJIN HEAVY EQUIP ENG RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide an etchant and a display method for displaying prior austenite grain boundaries of heat-resistant steel, to solve the problem of complex operation, unclear display of grain boundaries and high requirements for operators in existing display methods. , a problem that is not conducive to large-scale industrial application

Method used

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  • Corrosive for displaying heat-resistant steel original austenite grain-boundary and displaying method thereof
  • Corrosive for displaying heat-resistant steel original austenite grain-boundary and displaying method thereof
  • Corrosive for displaying heat-resistant steel original austenite grain-boundary and displaying method thereof

Examples

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Embodiment 1

[0038] The components of the etchant in this embodiment are: 1.2g of potassium permanganate, 10ml of concentrated sulfuric acid with a mass fraction of 98%, and 90ml of distilled water.

[0039] A method for displaying prior austenite grain boundaries of heat-resistant steel in this embodiment includes the following steps:

[0040] S1. Sample preparation, grinding and polishing;

[0041] The steps are specifically:

[0042] a. Sample preparation: Cut a metallographic sample with a size of 10×10×20mm from 13Cr9Mo2Co1NiVNbNB steel with a wire electric discharge machine;

[0043]b. Grinding of the sample: Grind the sample with silicon carbide water-resistant sandpaper of 180 mesh, 400 mesh, 600 mesh, 800 mesh, 1000 mesh, and 1200 mesh in sequence, and set the speed of the grinding disc to 300-600rpm, and replace the next When using sandpaper for the first time, rotate the sample 90 degrees along the grinding surface, so that the grinding marks of the new pass are perpendicular ...

Embodiment 2

[0053] The difference between this example and Example 1 is that the components of the etchant are different, specifically: 0.8g potassium permanganate, 10ml concentrated sulfuric acid with a mass fraction of 98%, and 90ml distilled water.

[0054] Other steps of the display method in Embodiment 2 are the same as Embodiment 1.

[0055] The original austenite grain boundary of the 13Cr9Mo2Co1NiVNbNB heat-resistant steel shown in Example 2 is as follows figure 2 As shown in the figure, the grain boundary in the figure is clear and complete, and it is approximately grid-like.

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Abstract

The invention relates to a corrosive for displaying heat-resistant steel original austenite grain-boundary and a displaying method thereof, belongs to the technical field of gold-phase sample preparation, and solves the problems of unclear display and complicated displaying method for heat-resistant steel original austenite grain-boundary. The corrosive is prepared from potassium permanganate, concentrated sulfuric acid and distilled water. The displaying method comprises the following steps: S1, preparing, grinding and polishing a sample; S2, preparing corrosive and performing chemical corrosion; and S3, observing the original austenite grain-boundary. The corrosive can quickly and easily display the original austenite grain-boundary of heat-resistant steel and determine the performance by analyzing and determining whether the original austenite grain-boundary has thick grains or not, and provides important accordance to constitution of the production process.

Description

technical field [0001] The invention relates to the technical field of metallographic sample preparation, in particular to an etchant and a display method for displaying the original austenite grain boundary of heat-resistant steel. Background technique [0002] Heat-resistant steel is widely used in ultra-supercritical steam turbines, boilers, and cylinder blocks. Due to its high service temperature, its performance requirements are strict, and the original austenite grains and their uniformity directly affect various properties of steel, such as The strength, toughness, oxidation resistance, fatigue life and other performance indicators of steel, the coarse austenite grains often lead to the coarse structure of the material after cooling, resulting in lower toughness and plasticity of the material, which greatly reduces the comprehensive mechanical properties of the material . Therefore, grain boundary display technology is an indispensable work in the process of steel pr...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N21/84
CPCG01N1/32G01N21/84G01N2021/8477
Inventor 常军委李康朱琳
Owner TIANJIN HEAVY EQUIP ENG RES
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