Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 steel, which solves the difficulty in displaying the original austenite grain of NiCrMoV rotor steel after long-term high-temperature tempering treatment the puzzle

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N1/32
Inventor 刘鹏刘霞赵炳戈高玉来
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com