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Method for displaying ultralow carbon IF (Interstitial-Free) sheet metallographic structure

A technology of metallographic structure and display method, which is applied in the field of metallographic inspection, can solve the problems that ferrite grain boundaries cannot be clearly displayed, and achieve the effects of easy embossment of grain boundaries, low cost, and simple preparation method

Active Publication Date: 2014-06-11
SHOUGANG CORPORATION
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for displaying the metallographic structure of an ultra-low carbon IF thin plate, which solves the problem that the ultra-low carbon steel with a carbon content below 0.002% cannot clearly display the ferrite grain boundary with conventional etching methods To solve the problem, metallographic specimens of ultra-low carbon IF steel sheets can be effectively prepared and their structures can be clearly displayed

Method used

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  • Method for displaying ultralow carbon IF (Interstitial-Free) sheet metallographic structure
  • Method for displaying ultralow carbon IF (Interstitial-Free) sheet metallographic structure
  • Method for displaying ultralow carbon IF (Interstitial-Free) sheet metallographic structure

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Embodiment Construction

[0020] Experiment 1 Preparation of metallographic samples of IF thin plate with carbon content of 0.0014% (mass percentage) and display of ferrite structure.

[0021] The steps for the preparation of the metallographic sample and the display of the ferrite structure are as follows:

[0022] 1) Mounting: Open the mounting machine, put 12g mounting powder in the mounting chamber, insert the IF steel thin plate sample into the mounted powder, cover the mounting machine cover, pressurize, set the mounting time as 3 minutes to cool The time is 2 minutes, after cooling, take out the mounted sample.

[0023] 2) Grinding: Grind the inlaid samples on water sandpaper, and the order of sandpaper grinding is No. 150, No. 300, No. 600 and No. 800. When grinding, make sure to rinse with water before changing each sandpaper and remove the wear marks of the previous sandpaper, and pay attention that the whole sample should be parallel to the top and bottom, and the same plane cannot be worn ...

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Abstract

The invention provides a method for displaying an ultralow carbon IF (Interstitial-Free) sheet metallographic structure, belonging to the technical field of metallographic examination. The method comprises the testing steps of inserting a test sample, roughly grinding, elaborately polishing and etching, and collecting pictures. The method has the advantages that clear and complete structure pictures of ferrite crystal grains can be obtained through the technology, the operation is simple, the problems that ultralow carbon sheet ferrite crystal grains are incompletely displayed and grain boundaries are embossed seriously can be solved, and the method is especially applicable to structure display of ultralow carbon IF sheet steel with the carbon content of 0.002% below.

Description

technical field [0001] The invention belongs to the technical field of metallographic inspection, and in particular provides a method for displaying the metallographic structure of an ultra-low carbon IF thin plate, which is suitable for detecting the ferrite structure of an ultra-low carbon IF thin plate metallographic sample with a carbon content below 0.002%. show. Background technique [0002] With the development of automobile manufacturing industry, in order to improve the deep drawing performance of automobile sheet, it has become a main research direction in the production of automobile sheet to vigorously develop ultra-low carbon series steel grades represented by IF steel. The carbon content of ultra-low carbon series steel is very low, generally C(wt)<0.002%, the steel is soft, and the structure is pure ferrite. It is difficult to clearly display its structure by conventional means. According to previous experience, the thin plate with 0.003%<C(wt)<0.006...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/32
Inventor 来萍温娟鞠新华刘卫平蔡宁胡佳利贾惠平其其格黄宁
Owner SHOUGANG CORPORATION
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