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Ultra-supercritical martensite heat resisting cast steel original austenite grain size display method

A technology of austenitic grain and heat-resistant cast steel, which is applied in particle size analysis, particle and sedimentation analysis, measuring devices, etc. It can solve the problems of complex operation, high operator requirements, and difficulty in mastering, and achieve simple corrosion conditions , easy to master, and easy to obtain raw materials

Active Publication Date: 2015-11-25
CHINA FIRST HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these corrosion methods can display the original austenite grain boundary, the operation is complicated, the operator is demanding, and it is difficult to master

Method used

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  • Ultra-supercritical martensite heat resisting cast steel original austenite grain size display method
  • Ultra-supercritical martensite heat resisting cast steel original austenite grain size display method
  • Ultra-supercritical martensite heat resisting cast steel original austenite grain size display method

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Experimental program
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Effect test

Embodiment 1

[0037]To perform grain display on ZG13Cr9Mo2Co1NiVNbNB cast steel material, the following steps are adopted:

[0038] first step:

[0039] Heat treatment for displaying original austenite grains: raise the temperature of the high-temperature furnace to 1100°C, and after the temperature stabilizes, put the sample in the furnace for 30 minutes, then quickly drop the temperature in the furnace to 800°C, and continue to hold the sample for 100 hours, then cooled to room temperature;

[0040] Step two:

[0041] Grinding and polishing of metallographic samples:

[0042] a. Cutting of metallographic samples: Cut a 15×15mm metallographic sample from the heat-treated sample showing the original austenite grains, remove the oxidized and decarburized part of the surface, and cut off about 5mm±1mm;

[0043] b. Grinding and polishing of metallographic samples: first remove the cutting marks on the surface of the sample with a grinding wheel, and then grind with water-resistant sandpaper...

Embodiment 2

[0051] To perform grain display on ZG13Cr9Mo2Co1NiVNbNB cast steel material, the following steps are adopted:

[0052] The first step: heat treatment for displaying the original austenite grains: raise the temperature of the high-temperature furnace to 1150°C, and after the temperature is stable, put the sample in the furnace for 16 hours, and then quickly drop the temperature in the furnace to 800°C, test The sample was kept warm for 100 hours, and then cooled to room temperature;

[0053] The second step: Grinding and polishing of the metallographic sample:

[0054] a. Cutting of metallographic samples: Cut a 15×15mm metallographic sample from the heat-treated sample showing the original austenite grains, remove the oxidized and decarburized part of the surface, and cut off about 5mm±1mm;

[0055] b. Grinding and polishing of metallographic samples: first remove the cutting marks on the surface of the sample with a grinding wheel, and then grind with water-resistant sandpap...

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Abstract

The invention discloses an ultra-supercritical martensite heat resisting cast steel original austenite grain size display method, and belongs to the technical field of smelting metallographic structure sample analysis and inspection. The method comprises the steps that 1, austenitizing heat preservation is performed on a sample, wherein the temperature of a high-temperature furnace is increased to 1100 DEG C to 1150 DEG C, the sample is placed in the furnace for heat preservation, the temperature of the sample is quickly lowered to 800 DEG C in the furnace, heat preservation is performed, and then the temperature is lowered to the room temperature; 2, metallographic sample cutting is performed, wherein oxidation and decarbonization portions on the surface of a metallographic sample, with the specification of 15*15 mm, of the sample material processed through heat treatment are removed, and metallographic sample grinding and polishing are performed, wherein the surface of the sample is washed clean, and the sample is placed on a polishing machine to be polished; 3, a corrosive agent is prepared, wherein the volume ratio of nitric acid to alcohol is (6-10):(94-90), and chemical corrosion is performed, wherein the polished surface of the sample is upwards placed in a corrosive solution to enable the solution to cover the surface of the sample, and then the sample is taken out after being stood for 15-30 minutes on the room temperature condition; 4, grain size observation and statistics are performed, wherein a metallograph is taken for the sample.

Description

technical field [0001] The invention relates to a display method capable of clearly displaying the original austenite grain size of ultra-supercritical martensitic heat-resistant cast steel, and belongs to the technical field of analysis and inspection of smelting metallographic structure samples. Background technique [0002] The original austenite grain size and its uniformity directly affect various properties of steel, such as strength, hardenability, oxidation resistance and so on. In the field of actual production, ordering manufacturers often require suppliers to provide grain size grades of ultra-supercritical 9-12% Cr martensitic heat-resistant cast steel products. In the field of material research and development, the influence of different normalizing or quenching processes on the grain size of ultra-supercritical 9-12% Cr martensitic heat-resistant cast steel can be studied by means of grain size display, and the austenite grain size can also be studied. Grain g...

Claims

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Application Information

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IPC IPC(8): G01N15/02G01N1/32
Inventor 董治中李云婷李康高敬恩陈席国周应应
Owner CHINA FIRST HEAVY IND
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