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Etchant solution and method for displaying grain size of 0Cr17Ni4Cu4Nb precipitation hardening stainless steel

A technology of 0cr17ni4cu4nb and corrosion solution, which is applied in the field of metallographic detection and can solve the problem of unclear display of grain size

Pending Publication Date: 2021-05-11
C&U CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a corrosion solution and method for displaying the grain size of 0Cr17Ni4Cu4Nb precipitation-hardened stainless steel, which solves the problem of unclear grain size display in the metallographic detection of 0Cr17Ni4Cu4Nb in the prior art

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  • Etchant solution and method for displaying grain size of 0Cr17Ni4Cu4Nb precipitation hardening stainless steel
  • Etchant solution and method for displaying grain size of 0Cr17Ni4Cu4Nb precipitation hardening stainless steel
  • Etchant solution and method for displaying grain size of 0Cr17Ni4Cu4Nb precipitation hardening stainless steel

Examples

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Embodiment 1

[0027] Example 1 This example provides a corrosion solution for displaying the grain size of 0Cr17Ni4Cu4Nb precipitation hardening stainless steel, which includes two parts of corrosion solution A and corrosion solution B, wherein:

[0028] Corrosion solution A includes 10-15ml of 37% hydrochloric acid, 10-15g of ferric chloride and 85-90ml of deionized water;

[0029] Corrosion solution B includes 3-4ml of 40% HF solution, 10-15ml of alcohol (analytical grade), 6-7ml of 68% nitric acid solution, and 75-80ml of deionized water.

[0030] In this embodiment, the corrosion solution A is prepared with hydrochloric acid, which can prevent the hydrolysis of ferric ions in the ferric chloride solution during the process of corroding 0Cr17Ni4Cu4Nb precipitation hardened stainless steel. Since the potential of the ferric ions in the corrosion solution A is higher than that of the ferrous ions, the ferric ions can oxidize iron into ferrous ions and dissolve.

[0031] And due to the hig...

Embodiment 2

[0032] Example 2 This example provides a corrosion method for displaying the grain size of 0Cr17Ni4Cu4Nb precipitation hardening stainless steel, which includes the following steps:

[0033] Step 1. After inlaying and fixing the 0Cr17Ni4Cu4Nb precipitation hardened stainless steel sample through an automatic inlay machine, the inlay surface of the sample is polished on 180#, 400#, 1000#, 2000# water abrasive paper in turn——180#, 400 #, 1000#, and 2000# correspond to two coarse grinding processes and two fine grinding processes respectively, and then polish on a polishing machine until there are no scratches. Rinse with clean water first, then wash and dry with alcohol to make the sample to be corroded.

[0034] Step 2. Put 10-15ml of 37% hydrochloric acid, 10-15g of ferric chloride and 85-90ml of deionized water in proportion. Pour ferric chloride into deionized water fully, and stir fully with a glass until Dissolve everything to obtain solution a, then use a glass rod to dr...

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Abstract

The invention provides an etchant solution and method for displaying the grain size of 0Cr17Ni4Cu4Nb precipitation-hardened stainless steel, and belongs to the technical field of metallographic detection treatment. The etchant solution comprises an etchant solution A and an etchant solution B, wherein the etchant solution A comprises hydrochloric acid, ferric trichloride and deionized water, and the etchant solution B comprises an HF solution, alcohol (analytically pure), a nitric acid solution and deionized water. Compared with an electrolytic erosion method, the method is adopted for treating the 0Cr17Ni4Cu4Nb precipitation hardening stainless steel, the process is more moderate and easy to control, so that the problem of display blurring caused by excessive electrolytic erosion can be effectively avoided, and meanwhile, the defect of display blurring caused by insufficient chemical erosion degree in the prior art is overcome.

Description

technical field [0001] The invention relates to the technical field of metallographic detection, in particular to a corrosion solution and a method for displaying the grain size of 0Cr17Ni4Cu4Nb precipitation-hardened stainless steel. Background technique [0002] 0Cr17Ni4Cu4Nb is a martensitic precipitation hardening stainless steel. The carbon content of 0Cr17Ni4Cu4Nb steel is low, and its corrosion resistance, oxidation resistance, excellent formability and welding performance are all good, so it is widely used in aerospace, petroleum, chemical, nuclear Industry, energy and other industrial fields, as well as wear-resistant, corrosion-resistant, high-strength structural parts used below 370 °C. [0003] The grain size of metal materials has a decisive influence on its various mechanical properties at room temperature and high temperature, and is an important parameter of steel. The 0Cr17Ni4Cu4Nb precipitation hardening stainless steel must have high strength and has stri...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N1/34
CPCG01N1/32G01N1/34
Inventor 董周
Owner C&U CO LTD
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