Corrosive used for displaying initial austenite grain boundary of medium and low carbon steel and corrosion method
A technology of austenite grain boundary and corrosive agent, which is applied in the field of metallographic sample preparation, can solve the problem of difficulty in clearly displaying initial austenite grains, etc., and achieves the effects of good display effect, few types and simple operation.
Active Publication Date: 2018-12-14
SAIC GENERAL MOTORS +1
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Problems solved by technology
[0004] In view of this, the object of the present invention is to provide an etchant and corrosion method for displaying the initial austenite grain boundaries of medium and low carbon steels, so as to solve the problem that it is difficult to clearly display initial austenite grains in the corrosion of medium and low carbon steels
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Embodiment 1
[0034] The raw materials of the etchant are: 100ml of distilled water; 6g of picric acid; 6g of fatty acid polyoxyethylene ether (FMEE 80% of Shandong Youso Chemical Technology Co., Ltd.).
[0035] The process of corrosive liquid configuration is:
[0036] 1) Take 100ml of distilled water; put it in a glass container, and place it in a water bath at 60°C;
[0037] 2) Add 6g of picric acid, stir with a glass rod, and after fully dissolving, there are still some undissolved particles at the bottom, forming a saturated aqueous solution of picric acid;
[0038] 3) Add 6g fatty acid polyoxyethylene ether and stir with a glass rod to fully dissolve it.
[0039] Then follow the steps below for sample preparation and corrosion:
[0040] 1) Cutting and inlaying: cutting the fully austenitized and quenched sample to prepare a square sample with a size of about 10mm x 10mm, and then inlaying.
[0041] 2) Grinding: Grind the inlaid samples with 200#, 600#, 1200# sandpaper in sequence, ...
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The invention provides a corrosive used for displaying an initial austenite grain boundary of medium and low carbon steel and a corrosion method, and solves a problem that the medium and low carbon steel is corroded to be difficult to display the initial austenite grain boundary clearly. The corrosive used for displaying the initial austenite grain boundary of the medium and low carbon steel comprises water, picric acid and fatty alcohol-polyoxyethylene ether, wherein the amount of the fatty alcohol-polyoxyethylene ether relative to every 100 ml of water is 5 to 7 g, the amount of the picric acid is controlled to be dissolved in the water to form a picric acid saturated aqueous solution. According to the corrosive and the corrosion method, few types of chemical reagents are used by the corrosive, and the preparation is simple; the corrosion method is simple to operate; a display effect is good, and the corrosive can be repeatedly used.
Description
technical field [0001] The invention relates to the technical field of metallographic sample preparation in physical and chemical testing, in particular to a corrosive agent and a corrosion method for displaying initial austenite grain boundaries of medium and low carbon steels. Background technique [0002] The initial austenite grain size of the steel will directly affect the microstructure change in the process of controlled rolling and controlled cooling, thus having a great influence on the mechanical properties of the material. Therefore, it is of great significance to accurately display the initial austenite grains of steel. In addition, in the failure analysis, the initial austenite grains can reflect the structural state of the parts before quenching or normalizing heat treatment, which is helpful for engineers and technicians to judge whether there are structural defects such as coarse grains and mixed crystals in the parts. There are many methods to display auste...
Claims
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Login to View More IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 刘鹏鹏魏一凡叶又李迎超
Owner SAIC GENERAL MOTORS