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Etchant manufacturing and etching method for displaying grain boundary of low-carbon super martensitic stainless steel

A martensitic stainless steel and etchant technology, which is applied in the field of metallographic inspection of metal materials, can solve the problems of unreasonable erosion methods and lack of suitable etchants for super martensitic stainless steel, so as to improve the success rate of erosion, stable composition and safety. high sex effect

Inactive Publication Date: 2020-03-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention mainly provides a production and etching method of an etchant that can display the grain boundaries of super martensitic stainless steel, and solves the problems that there is no suitable etchant for super martensitic stainless steel and the erosion method is unreasonable

Method used

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  • Etchant manufacturing and etching method for displaying grain boundary of low-carbon super martensitic stainless steel
  • Etchant manufacturing and etching method for displaying grain boundary of low-carbon super martensitic stainless steel

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1) The method of wire cutting and lathe processing is adopted to cut the metallographic sample blank of suitable size. This embodiment adopts a thermally compressed cylindrical sample. After the sample was austenitized at 1200°C for 2min, it was austenitized at 1200°C for 2.5s -1 The deformation speed is compressed and deformed, and the deformation amount is 60%. The above thermal compression process is carried out on the Gleeble 1500 thermal simulation test machine, and then the thermally compressed sample is wire-cut, which is used as the blank of the metallographic sample.

[0033] 2) Use multiple sandpapers from coarse to fine to grind the super martensitic stainless steel sample, and the order of sandpaper selection is 400 # ,600 # ,800 # ,1000 # ,1200 # ,1500 # ,2000 # . Polish the ground sample with a metallographic polishing machine until the surface of the sample is bright without scratches. Select one of the polished super martensitic stainless steel s...

Embodiment 2

[0040] 1) Adopt the method of wire cutting and lathe processing, cut the metallographic sample blank of suitable size, present embodiment adopts thermal compression cylindrical sample equally, and this cylindrical sample cross-sectional diameter is 8mm, and length is 15mm, and this cylindrical After the shaped sample was austenitized at 1200°C for 2min, it was austenitized at 1200°C for 2.5s -1 The deformation speed is compressed and deformed, and the deformation amount is 60%. The above thermal compression process is carried out on the Gleeble 1500 thermal simulation test machine, and then the thermally compressed sample is wire-cut, which is used as the blank of the metallographic sample.

[0041] 2) Use multiple sandpapers from coarse to fine to grind the super martensitic stainless steel sample, and the order of sandpaper selection is 400 # ,600 # ,800 # ,1000 # ,1200 # ,1500 # ,2000 # . Polish the ground sample with a metallographic polishing machine until the surf...

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Abstract

The invention discloses a manufacturing and etching method of an etchant for displaying the grain boundary of super martensitic stainless steel, and belongs to the field of metallographic examinationof metal materials. The method is used for observing the grain boundary and detecting the grain size, and specifically, the erodible steel is 13Cr super martensitic stainless steel. The corrosive agent comprises potassium permanganate, sulfuric acid and water according to a mass ratio of 1: 23-30: 83-87, and the water is deionized water or common tap water. The invention further discloses a methodfor displaying the grain boundary of the super martensitic stainless steel by adopting the etchant. By adopting the etchant and the etching method, the grain boundary of the super martensitic stainless steel can be well displayed, the etchant and the etching method have the advantages that the operation is simple, the display effect is good, the etching time is short, the etching can be completedwithin several minutes, and the etching success rate can be greatly improved by adopting a sample preparation method.

Description

technical field [0001] The invention belongs to the field of metallographic inspection of metal materials, and in particular relates to a production and erosion method of an etchant for low-carbon super martensitic stainless steel. Background technique [0002] Martensitic stainless steel is a very important type of stainless steel. Unlike other stainless steels, its hardenability is quite good. After quenching and tempering and other heat treatment processes, it can obtain higher strength, hardness and wear resistance. At present, martensitic stainless steel is widely used in steam turbine blades, hydropower station equipment and other fields. Super martensitic stainless steel is obtained by reducing the carbon content (≤0.03%) on the basis of martensitic stainless steel, and adding 3.5% to 4.5% nickel and 1.5% to 2.5% molybdenum. Super martensitic stainless steel not only has the advantages of high hardness and good wear resistance of traditional martensitic stainless ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 刘靖张久杨
Owner UNIV OF SCI & TECH BEIJING