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Method for displaying and treating Cr12 type martensitic heat-resistant steel primary austenite grain boundary

A technology for displaying processing methods and austenite grain boundaries, which is applied in the field of metallographic preparation and can solve problems such as difficulty in displaying grain boundaries

Inactive Publication Date: 2013-08-07
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for displaying the original austenite grain boundary in the experiment of studying the grain growth law of Cr12 type martensitic heat-resistant steel, so as to solve the problem in the experiment of studying the grain growth law of Cr12 type martensitic heat-resistant steel. Difficult Problems of Grain Boundary Display

Method used

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  • Method for displaying and treating Cr12 type martensitic heat-resistant steel primary austenite grain boundary
  • Method for displaying and treating Cr12 type martensitic heat-resistant steel primary austenite grain boundary
  • Method for displaying and treating Cr12 type martensitic heat-resistant steel primary austenite grain boundary

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Experimental program
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Effect test

Embodiment 1

[0029] Select 10Cr12Ni3Mo2VN as the sample, and carry out the processing method of displaying the grain boundary of the steel body prior to austenite. The chemical composition of the 10Cr12Ni3Mo2VN is: C: 0.11%, Si: 0.20%, Mn: 0.75%, Cr: 11.8%, Ni: 2.7%, Mo: 1.7%, V: 0.3%.

[0030] The processing method includes the following steps:

[0031] Step 1. First cut a 10×12×15mm block sample, place one of the planes of the sample on 240#, 400#, 600#, 800#, 1000# (that is, the particle size is 240 mesh, 400 mesh, 600 mesh, respectively). mesh, 800 mesh, 1000 mesh) on metallographic sandpaper from coarse to fine.

[0032] Before changing the sandpaper each time, ensure that there is no scratch on the surface of the sample perpendicular to the polishing direction. When changing the sandpaper, the sample is rotated at an angle of 90 degrees, and finally polished with 1000# sandpaper.

[0033] Step 2. Raise the temperature of the heating furnace to a predetermined temperature, and then ...

Embodiment 2

[0039] 12Cr12 is selected as the sample for the processing method of displaying the grain boundary of prior austenite in the steel body, wherein the chemical composition of the selected 12Cr12 is: C≤0.15%, Si≤0.50%, Mn≤1.00%, P≤0.040%, S≤0.030%, Ni≤0.60%, Cr: 11.50%-13.00%.

[0040] The processing method includes the following steps:

[0041] Step 1. First cut a 10×12×15mm block sample, and polish one of the planes of the sample on 320#, 600#, 800#, 1000# metallographic sandpaper from coarse to fine.

[0042] Before changing the sandpaper each time, ensure that the polished surface of the sample has no scratches perpendicular to the polishing direction. When changing the sandpaper, the sample is rotated at an angle of 90 degrees, and finally polished with 1000# sandpaper.

[0043] Step 2. Raise the temperature of the heating furnace to a predetermined temperature, and then put the polished sample into the heating furnace, wherein the polished surface is in contact with the ai...

Embodiment 3

[0048] Select 10Cr12Ni3Mo2VN as the treatment method for the sample to display the grain boundary of prior austenite in steel body.

[0049] The processing method includes the following steps:

[0050] Step 1. First cut a 10×12×15mm block sample, and polish one of the planes of the sample on 240#, 400#, 600#, 800#, 1200# metallographic sandpaper from coarse to fine.

[0051] Before changing the sandpaper each time, ensure that there is no scratch on the surface of the sample perpendicular to the polishing direction. When changing the sandpaper, the sample is rotated at an angle of 90 degrees, and finally polished with 1200# sandpaper.

[0052] Step 2. Raise the temperature of the heating furnace to a predetermined temperature, and then put the polished sample into the heating furnace, wherein the polished surface is in contact with the air, and keep the temperature for a predetermined time. After the heat preservation is completed, the sample is quenched.

[0053] Step 3. Wat...

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Abstract

The invention relates to the technical field of metallographic phase preparation, and in particular relates to a method for displaying and treating Cr12 type martensitic heat-resistant steel primary austenite grain boundary by high-temperature oxidation and room temperature erosion. The method comprises four steps of preparing a polished sample, carrying out heat treatment, finely grinding and polishing, and etching. The method concretely comprises the steps of: firstly, preparing the sample, and grinding one of the planes of the sample to be smooth; then, putting the sample into a heating furnace, carrying out heat preservation under the condition of the temperature and time parameters to be researched, and quenching after heat preservation; carrying out water milling on the sample, keeping a certain angle between the polished surface and abrasive paper during water milling, guaranteeing that the surface of the sample is provided with a matrix-oxidation zone transition area, polishing, etching by an erosion reagent, cleaning by alcohol and then blowing the product to be dry; and observing the clear primary austenite grain boundary under a microscope. According to the technical scheme of the method, the implementation is simple and convenient; and after the technical scheme is implemented, the material primary austenite grain boundary is not influenced by a matrix metallographic structure simultaneously when being clearly and integrally displayed.

Description

technical field [0001] The invention belongs to the technical field of metallographic preparation, in particular to a method for displaying the original austenite grain boundary of Cr12 type martensitic heat-resistant steel by means of high temperature oxidation and room temperature etching. Background technique [0002] The austenite grain size of steel is one of the main indicators affecting the performance of steel. The study of austenite grain size is of great significance for the production process of steel and the quality and performance control of steel products. Cr12-type martensitic heat-resistant steel has strict requirements on grain size, so it is an essential work to study the grain size of prior austenite under different heating temperatures and different holding times. This shows that the technology that can clearly and completely display the prior austenite grain boundary plays an important role. At present, some scholars have explored the method of displayi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
Inventor 李俊儒刘雅政周乐育龚臣宋明强
Owner UNIV OF SCI & TECH BEIJING
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