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A method for displaying prior austenite grain boundaries in martensitic heat-resistant steel

A technology of austenite grain boundary and display method, which is applied in the preparation of test samples and other directions, can solve the problems of simultaneous display, little difference in corrosion degree, and poor grain boundary display effect.

Inactive Publication Date: 2020-03-17
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inventor found that: the existing technology for displaying the prior austenite grain boundary of martensitic heat-resistant steel not only displays the grain boundary, but also shows the structure and morphology inside the grain, which leads to the fundamental reason for the poor display effect of the grain boundary. The reason is that the corrosion resistance difference between the original austenite grain boundary and the inside of the grain after quenching of the martensitic heat-resistant steel is small, so the corrosion degree is often not much different during the corrosion process, resulting in the display of the original austenite grain boundary at the same time Will show the grain boundaries of the intra-grain structure, and eventually lead to poor display of prior-austenite grain boundaries
Therefore, the present invention changes the difference in corrosion resistance between the original austenite grain boundary and the interior of the grain by cooling the austenitized martensitic heat-resistant steel at a constant temperature and then cooling it, thereby solving the problem of original austenite in the corrosion process. Simultaneous display of the tenite grain boundary and the internal structure of the grain

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  • A method for displaying prior austenite grain boundaries in martensitic heat-resistant steel
  • A method for displaying prior austenite grain boundaries in martensitic heat-resistant steel

Examples

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Embodiment 1

[0060] A method for displaying prior austenite grain boundaries in martensitic heat-resistant steel, comprising the following steps:

[0061] (1) Keep the 10Cr12Ni3Mo2VN steel at 1050°C for 1h, carry out austenitization, then place it in a heating furnace at 700°C for 1h at a constant temperature, and then air cool to room temperature;

[0062] (2) the 10Cr12Ni3Mo2VN steel that is air-cooled to room temperature in step (1) is made into a sample, and one of the planes of the sample is polished successively with 240#, 400#, 600#, 800#, 1000# metallographic sandpaper; 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. After polishing, polish, polish to a mirror surface without scratches and stains, and then blow dry;

[0063] (3) Carry out electrolytic etching to the polished sample of step (2), the polished sa...

Embodiment 2

[0065] A method for displaying prior austenite grain boundaries in martensitic heat-resistant steel, comprising the following steps:

[0066] (1) Keep the 10Cr12Ni3Mo2VN steel at 1100°C for 0.5h for austenitization, then place it in a heating furnace at 750°C for 1h at a constant temperature, and then air cool to room temperature;

[0067](2) the 10Cr12Ni3Mo2VN steel that is air-cooled to room temperature in step (1) is made into a sample, and one of the planes of the sample is polished successively with 240#, 400#, 600#, 800#, 1000# metallographic sandpaper; 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. After polishing, polish, polish to a mirror surface without scratches and stains, and then blow dry;

[0068] (3) Carry out electrolytic etching to the polished sample of step (2), the polished sample i...

Embodiment 3

[0070] A method for displaying prior austenite grain boundaries in martensitic heat-resistant steel, comprising the following steps:

[0071] (1) Keep the 10Cr12Ni3Mo2VN steel at 1040°C for 1.5h for austenitization, then place it in a heating furnace at 700°C for 1.5h at a constant temperature, and then air cool to room temperature;

[0072] (2) the 10Cr12Ni3Mo2VN steel that is air-cooled to room temperature in step (1) is made into a sample, and one of the planes of the sample is polished successively with 240#, 400#, 600#, 800#, 1000# metallographic sandpaper; 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. After polishing, polish, polish to a mirror surface without scratches and stains, and then blow dry;

[0073] (3) Carry out electrolytic etching to the polished sample of step (2), the polished sampl...

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Abstract

The invention relates to a martensite type heat-resistant steel original austenite grain boundary display method, and relates to the technical field of original austenite grain boundary display. The display method comprises the steps that firstly, martensite type heat-resistant steel is subjected to heat preservation for 0.5-1.5 h at the temperature ranging from 1,000 DEG C to 1,100 DEG C, and then austenitizing can be conducted; secondly, the martensite type heat-resistant steel obtained after austenitizing in the first step is subjected to constant-temperature heat preservation for 1-2 h atthe temperature ranging from 650 DEG C to 750 DEG C, and then air cooling is conducted to the room temperature; thirdly, after the martensite type heat-resistant steel subjected to air cooling to theroom temperature in the second step is manufactured into a sample, grinding and polishing are conducted; and fourthly, the polished martensite type heat-resistant steel is subjected to electrolytic etching, and then martensite type heat-resistant steel original austenite grain boundary display can be achieved. According to the martensite type heat-resistant steel original austenite grain boundarydisplay method, corrosion resistance between the original austenite grain boundary and the intragranular structure grain boundary of the martensite type heat-resistant steel is changed through a constant-temperature heat preservation manner; and through the manner, the original austenite grain boundary can be clearly displayed while the intragranular structure is not displayed, and the display effect of the original austenite grain boundary is greatly improved.

Description

technical field [0001] The invention relates to the technical field of displaying prior austenite grain boundaries, in particular to a method for clearly displaying prior austenite grain boundaries of martensitic heat-resistant steel through preheating. Background technique [0002] The display of the original austenite grain boundary, that is, the martensite structure is obtained by quenching after the steel is austenitized and heated, and the original austenite grain boundary is still retained after quenching, and then the original austenite grain boundary in the steel is made technology shown. Since the size of prior-austenite grains has an extremely important impact on the properties of steel, the research on prior-austenite grain boundary display technology has always been one of the key tasks in the field of steel. How to quickly and clearly display the steel after heat treatment Prior-austenite grain boundaries are of great significance to the study of steel. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32
CPCC21D6/004C21D6/005C21D6/008C21D2211/008C22C38/02C22C38/04C22C38/44C22C38/46C23F1/28C25F3/06G01N1/32
Inventor 李俊儒王力伟程联军李红
Owner QINGDAO UNIV
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