Method for fast displaying original austenite grains of maraging steel containing Cr

A technology of maraging steel and austenite grains, applied in the field of physical detection, can solve the problems of difficulty in displaying austenite grains, and achieve the effects of short corrosion time, good reproducibility, and simple operation

Inactive Publication Date: 2013-11-27
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for quickly and clearly displaying the original austenite grains of Cr

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  • Method for fast displaying original austenite grains of maraging steel containing Cr
  • Method for fast displaying original austenite grains of maraging steel containing Cr

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[0020] Example 1: Chemical composition (wt%) of sample 1: C: 0.002, Ni: 14.06, Cr: 3.19, Ti: 1.32, Al: 0.16, Si: 0.064, Mn: 0.032, S: 0.002, P: 0.0019 , the remainder for inevitable inclusions and iron. The solution-treated sample was ground and polished after being kept at 510 °C for 5 hours and aging; the corrosive agent was prepared according to the following ratio: mass percentage of 36% hydrochloric acid: 10 ml, mass percentage of 68% nitric acid: 1 ml, distilled water: 10 ml. When preparing, first measure 10ml of distilled water and put it into a vessel, then add hydrochloric acid and nitric acid to the distilled water, and stir with a glass rod. Due to the exothermic reaction, the prepared caustic needs to stand for 3 minutes. Put a little absorbent cotton at the bottom of the vessel, and then put the polished sample into the solution for etching, the etching surface of the sample is facing down, and the etching time is 20s. When the polished surface of the sample tu...

Example Embodiment

[0021] Example 2: Chemical composition (wt%) of sample 2: C: 0.0018, Ni: 12.64, Cr: 8.92, Ti: 1.37, Al: 0.052, Si: 0.016, Mn: 0.010, S: 0.003, P: 0.0024 , the remainder for inevitable inclusions and iron. The solution-treated + cold-treated samples were ground and polished after being kept at 510°C for 5 hours and aging; the corrosive agent was prepared according to the following ratio: 36% hydrochloric acid: 10ml, 68% nitric acid: 2ml, distilled water: 10ml . When preparing, first measure 10ml of distilled water and put it into a vessel, then add hydrochloric acid and nitric acid to the distilled water, and stir with a glass rod. Due to the exothermic reaction, the prepared caustic needs to stand for 3 minutes. Put a little absorbent cotton at the bottom of the vessel, and then put the polished sample into the solution for etching, the etching surface of the sample is facing down, the etching time is 30s, when the polished surface of the sample turns gray, take it out, wash ...

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Abstract

The invention relates to a method for fast displaying original austenite grains of maraging steel containing Cr. The method is characterized by comprising the following steps: a, preparing a sample, wherein an aging state sample is subjected to grinding and polishing; b, configuring a corrodent, wherein 10 ml distilled water is poured in a utensil, 10 ml hydrochloric acid and 1-2 ml nitric acid are added into the distilled water, stirring by a glass rod is performed, still standing is carried out, the weight percentage of the hydrochloric acid is 36%, and the weight percentage of the nitric acid is 68%; c, performing sample corrosion, wherein absorbent cotton is placed at the bottom of the utensil, the polished sample is placed in the corrodent for corrosion, the erosion surface of the sample is downward, the erosion time is 20-30 s, when the polished surface of the sample becomes gray, the sample is taken out, cleaned and dried, and the austenite grains are observed under a microscope. The method has the advantages that heating is eliminated, and the operation can be carried out at room temperature; the operation is simple, and the corrosion time is short; the repeatability is better.

Description

technical field [0001] The invention belongs to the technical field of physical detection, and in particular relates to a method for quickly displaying the original austenite grains of Cr-containing maraging steel. Background technique [0002] The austenite grains of steel have a great influence on the strength, toughness and fatigue resistance of steel and other performance indicators. Coarse austenite grains will reduce the comprehensive mechanical properties of the material. Therefore, it is important to detect the size of austenite grains. significance. [0003] Whether austenite grains can be clearly displayed depends on various factors such as the chemical composition of the sample, heat treatment state, etching time, etching method, etchant, etc. There are many commonly used display methods, among which the better effect is Grain boundary corrosion method, the most used method is saturated picric acid aqueous solution or alcohol solution, and sometimes a little dete...

Claims

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Application Information

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IPC IPC(8): G01N1/32C23F1/28
CPCC23F1/28G01N1/32G01N2001/2866
Inventor 杨维宇杨卓越吴静
Owner INNER MONGOLIA BAOTOU STEEL UNION
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