Method for making super-low carbon steel gold-phase sample and displaying its tissue

Inactive Publication Date: 2007-08-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing ultra-low carbon steel metallographic samples and displaying structures, which solves the problem of difficulty in displaying austenite grains in ultra-low carbon steel

Method used

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  • Method for making super-low carbon steel gold-phase sample and displaying its tissue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Grinding

[0029] a. Coarse grinding

[0030] The sample is first subjected to 120 # →320 # →600 # Grinding with silicon carbide water sandpaper, use water as lubricant. The grinding disc rotates at 150 rpm to avoid scratches. When grinding, the sample should be rotated 90 degrees in the same direction every time the sand paper is changed, and the surface of the sample should be observed with a microscope to determine the state of the grinding surface.

[0031] b. Fine grinding-polishing

[0032] Clean the roughly ground sample in an ultrasonic instrument, and polish it on a polishing flannelette. At this time, use 6 μm diamond polishing agent and ethanol as a lubricant. After polishing for 3 minutes, observe the surface state under a microscope to confirm that the surface scratches are along one direction. Clean the ground sample in an ultrasonic instrument, replace it with a 3 μm diamond polishing agent, and use ethanol as a lubricant. After polishing for 3...

Embodiment 2

[0046] 1. Grinding

[0047] a. Coarse grinding

[0048] The sample is first subjected to 120 # →320 # →600 # Grinding with silicon carbide water sandpaper, use water as lubricant. The grinding disc rotates at 150 rpm to avoid scratches. When grinding, the sample should be rotated 90 degrees in the same direction every time the sand paper is changed, and the surface of the sample should be observed with a microscope to determine the state of the grinding surface.

[0049] b. Fine grinding-polishing

[0050]Clean the roughly ground sample in an ultrasonic instrument, and polish it on a polishing flannelette. At this time, use 6 μm diamond polishing agent and ethanol as a lubricant. After polishing for 3 minutes, observe the surface state under a microscope to confirm that the surface scratches are along one direction. Clean the ground sample in an ultrasonic instrument, replace it with a 3 μm diamond polishing agent, and use ethanol as a lubricant. After polishing for 3 ...

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Abstract

The invention relates to a method of preparing dead mild steel ultra-low-carbon steel golden phase sample and indicating structure, it belongs to preparation technology field of golden phase sample. The invention includes the following steps: thick grinding, thin grinding-polishing, eroding, arranging corrosion fluid. Its advantages are that: solves the difficult display problems of dead mild steel ultra-low-carbon steel austenite grain, obtains the clear photograph of austenite grain, The implementation of this invention is simple, it can easily prepare dead mild steel ultra-low-carbon steel golden phase sample.

Description

technical field [0001] The invention belongs to the technical field of metallographic sample preparation, and in particular provides a method for preparing a metallographic sample of an ultra-low carbon steel and a method for displaying a structure. It is used for preparing a metallographic sample of an ultra-low carbon steel. A technique for revealing the metallographic structure of mild steel. Background technique [0002] The austenite grain size of steel has a great influence on the strength, toughness, fatigue resistance and other performance indicators of steel, and it is an indispensable research method for studying the hereditary structure of steel. Assessing the austenite grain size of steel is an indispensable technical index for evaluating materials and has important practical significance. Yang Mei and Hu Zhihua studied the display of prior austenite grain boundaries of 45 steel and 40Cr steel in the state of quenching at different temperatures. 100ml of water, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G01N1/28G01N13/10G01Q30/20
Inventor 杨峰田文怀李春华苏永安
Owner UNIV OF SCI & TECH BEIJING
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