Metallographic corrosion method for clearly displaying original austenite grain boundary of NiCrMoV type rotor steel

A technology of austenite grain boundary and metallographic corrosion, applied in the preparation of test samples, etc., can solve problems such as difficulty in displaying original austenite grains

Inactive Publication Date: 2013-06-26
SHANGHAI UNIV +1
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  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to provide a metallographic corrosion method for displaying the original austenite grain boundary of NiCrMoV rotor s

Method used

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  • Metallographic corrosion method for clearly displaying original austenite grain boundary of NiCrMoV type rotor steel
  • Metallographic corrosion method for clearly displaying original austenite grain boundary of NiCrMoV type rotor steel
  • Metallographic corrosion method for clearly displaying original austenite grain boundary of NiCrMoV type rotor steel

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Embodiment 1

[0027] The technical process and steps of this implementation example are as follows:

[0028] a Coarse grinding: put the cut 25Cr2Ni2MoV rotor steel metallographic sample on the grinding wheel for grinding, grind off the surface oxide skin and roughly smooth it, put the polished sample in turn on 240 mesh, 400 mesh, 600 mesh , 800 mesh and 1000 mesh sandpaper (sandpaper placed on a smooth glass plate) for grinding. During the grinding process, it is necessary to observe frequently to ensure that all scratches are along the grinding direction of the pass and there are no obvious coarse scratches. When grinding the next pass, the sample should be rotated 90° before continuing to grind .

[0029] b Fine Grinding-Polishing: Put the coarsely ground sample on 1500 mesh and 2000 mesh sandpaper successively for grinding, the grinding method is the same as that of coarse grinding. Clean the ground sample, and polish it on a polishing cloth, using water as a lubricant, and using 1.0 ...

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Abstract

The invention relates to a metallographic corrosion method for clearly displaying the original austenite grain boundary of a NiCrMoV type rotor steel, and belongs to the field of metallographic sample preparation. The method comprises the steps of: coarse grinding, fine grinding, polishing and corroding; putting a polished sample into a corrosive liquid of 75 DEG C, wherein the formula of the corrosive liquid comprises 200ml of distilled water, 5g of picric acid, 2ml of 5% diluted hydrochloric acid and 4g of sodium dodecyl benzene sulfonate; etching for 2minutes, taking the sample out, cleaning the sample with flowing water, cleaning the sample with alcohol and drying; and observing the clear original austenite grain boundary through an optical microscope. The method has the advantages that a difficult displaying problem of the original austenite grains of the NiCrMoV type rotor steel is solved, the original austenite grain boundary can be very clearly displayed, and the method is simple and practicable.

Description

technical field [0001] The invention belongs to the field of metallographic sample preparation, in particular to a metallographic corrosion method for clearly displaying the original austenite grain boundaries of NiCrMoV type rotor steel. Background technique [0002] The original austenite grains of the steel directly affect the change of the structure during the subsequent processing. The original austenite grains not only affect the strength of steel, but also have a great influence on the mechanical properties of materials such as cold-brittle transformation and fracture. In addition, the austenite grain size also affects the phase transformation behavior of steel and thus affects the strengthening ability of steel. Therefore, it is of great significance to accurately display the austenite grains of steel. [0003] There are many ways to display original austenite. Luo Hong et al. used supersaturated picric acid + sodium dodecylbenzenesulfonate to clearly display the o...

Claims

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Application Information

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IPC IPC(8): G01N1/32
Inventor 刘鹏刘霞赵炳戈高玉来
Owner SHANGHAI UNIV
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