Metallographic corrosive agent for advanced high-strength steel residual austenite dyeing and using method of metallographic corrosive agent

A technology of residual austenite and etchant, applied in metallographic etchant for advanced high-strength steel residual austenite staining and its application field, can solve the problem of small contrast difference between residual austenite and martensite and the stability of etchant Insufficient, unable to effectively distinguish and other problems, to achieve the effect of good stability, convenient configuration, and excellent effect

Active Publication Date: 2019-07-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems with this color metallographic method. One is that the etchant is not stable enough. Even if the corrosion time is precisely controlled, the structure cannot be effec

Method used

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  • Metallographic corrosive agent for advanced high-strength steel residual austenite dyeing and using method of metallographic corrosive agent
  • Metallographic corrosive agent for advanced high-strength steel residual austenite dyeing and using method of metallographic corrosive agent
  • Metallographic corrosive agent for advanced high-strength steel residual austenite dyeing and using method of metallographic corrosive agent

Examples

Experimental program
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Effect test

Embodiment 1-6

[0044] Table 1 lists the ratio of each component of the metallographic etchant of Examples 1-6.

[0045] Table 1.

[0046]

[0047] Table 2 lists the mass percentage proportions of metallographic samples corroded by the metallographic etchant of Examples 1-6.

[0048] Table 2.

[0049]

[0050] The using method of the metallographic etchant of embodiment 1-6 adopts the following steps:

[0051] The metallographic sample in Table 2 is polished, and the metallographic sample obtained after polishing is immersed in the metallographic etchant listed in Table 1 for 5-20 seconds, then the surface of the metallographic sample is cleaned and dried, and the surface of the metallographic sample is examined under a color microscope. Observation.

[0052] It should be noted that, in some other embodiments, when cleaning the surface of the metallographic sample, it is first cleaned with distilled water, and then cleaned with absolute alcohol.

[0053] See the results observed in ...

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Abstract

The invention discloses a metallographic corrosive agent for advanced high-strength steel residual austenite dyeing. The metallographic corrosive agent is prepared from an alcoholic solution and a surfactant; the alcoholic solution is prepared from the components in percentage by mass: 3.5-15% of sulfuric acid, 12-15% of hydrochloric acid, 7-10% of FeCl3, and the balance of anhydrous alcohol. In addition, the invention discloses a using method of the metallographic corrosive agent. The method includes the steps that a polished metallographic sample is immersed in the metallographic corrosive agent for a period of time, then the surface of the metallographic sample is cleaned and blow-dried, and the metallographic sample is observed on a color microscope. The metallographic corrosive agentis good in stability and simple in formula, in practical application, various structures of steel are corroded by the metallographic corrosive agent to achieve sufficient contrast and the structures are effectively distinguished, and especially when advanced high-strength steel is subjected to metallographic corrosion by the metallographic corrosive agent, the structures of bainite, martensite, ferrite and residual austenite in the metallographic structure are all displayed, and different colors are presented.

Description

technical field [0001] The invention relates to a corrosive agent and a using method thereof, in particular to a corrosive agent suitable for steel types and a using method thereof. Background technique [0002] Advanced high-strength steel is mainly strengthened by phase transformation, so its structure is relatively complex. The structure of advanced high-strength steel contains martensite, ferrite, bainite and / or retained austenite, and the main steel series include dual phase steel (DP), twinning induced plasticity (TRIP) steel, multiphase steel ( CP), Quenched Partition Steel (QP Steel) and Martensitic Grade Steel (Mart), etc. Advanced high-strength steel (AHSS) for automobiles is divided into hot-rolled, cold-rolled and hot-dip galvanized products, and their process characteristics are all strengthened through phase transformation. The tensile strength of advanced high-strength steel can be as high as 1000MPa or more. In order to achieve high strength, more alloying ...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N1/30
CPCG01N1/30G01N1/32
Inventor 郑庆胡暑名王迎春范正洁
Owner BAOSHAN IRON & STEEL CO LTD
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