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Display method of original austenite crystal boundary of steel for making Co containing type ultra-supercritical set

An ultra-supercritical unit and austenite grain boundary technology, applied in the preparation of test samples, etc., can solve the problems of difficult and accurate evaluation of steel grain thickness and uniformity, and achieve effective display and simple operation

Active Publication Date: 2016-05-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for displaying the original austenite grain boundary of steel used in Co-containing ultra-supercritical units, so as to solve the problem of accurately evaluating the grain size and uniformity of a Co-containing ultra-supercritical unit steel The problem

Method used

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  • Display method of original austenite crystal boundary of steel for making Co containing type ultra-supercritical set
  • Display method of original austenite crystal boundary of steel for making Co containing type ultra-supercritical set
  • Display method of original austenite crystal boundary of steel for making Co containing type ultra-supercritical set

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1. Grinding - polishing

[0031] Take a steel sample for a Co-containing ultra-supercritical unit, grind the original austenite grain interface of the sample to be displayed, and then polish it. After polishing to no scratches, rinse and dry with alcohol;

[0032] 2. Pre-chemical etching

[0033] Cover the surface of the polished sample with saturated picric acid solution, let it stand for 60s, rinse it with clean water, and then dry it with alcohol;

[0034] 3. Electrolytic etching

[0035] A DC voltage controllable device equipped with a DC ammeter and a sliding resistor is used, the sample is used as an anode, and a stainless steel sheet is selected as a cathode, which is placed in an 8% dilute sulfuric acid aqueous solution; the sample has been chemically corroded in advance. Cathode stainless steel sheet, adjust the output voltage to 20V, move the sliding rheostat to make the current density reach 1.6A / cm 2 , keep the power-on time for 120s, so that the original...

Embodiment 2

[0039] 1. Grinding and polishing

[0040]Take a steel sample for a Co-containing ultra-supercritical unit, grind the original austenite grain interface of the sample to be displayed, and then polish it. After polishing to no scratches, rinse and dry with alcohol;

[0041] 2. Pre-chemical etching

[0042] Cover the surface of the polished sample with saturated picric acid solution, let it stand for 120s, rinse it with clean water, and then dry it with alcohol;

[0043] 3. Electrolytic etching

[0044] A DC voltage controllable device equipped with a DC ammeter and a sliding resistor is used, the sample is used as an anode, and a stainless steel sheet is selected as a cathode, and put into a dilute sulfuric acid aqueous solution with a mass fraction of 4% at the same time; the sample has been chemically etched in advance. Cathode stainless steel sheet, adjust the output voltage to 10V, move the sliding rheostat to make the current density reach 0.8A / cm 2 , keep the power-on t...

Embodiment 3

[0048] 1. Grinding and polishing

[0049] Take a steel sample for a Co-containing ultra-supercritical unit, grind the original austenite grain interface of the sample to be displayed, and then polish it. After polishing to no scratches, rinse and dry with alcohol;

[0050] 2. Pre-chemical etching

[0051] Cover the surface of the polished sample with saturated picric acid solution, let it stand for 80s, rinse it with clean water, and then dry it with alcohol;

[0052] 3. Electrolytic etching

[0053] A DC voltage controllable device equipped with a DC ammeter and a sliding resistor is used, the sample is used as the anode, and a stainless steel sheet is selected as the cathode, and it is placed in a dilute sulfuric acid aqueous solution with a mass fraction of 7%. Cathode stainless steel sheet, adjust the output voltage to 18V, move the sliding rheostat to make the current density reach 1.4A / cm 2 , keep the power-on time for 150s, so that the original austenite grain interf...

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Abstract

The invention relates to a technical field of metallographic sample crystal boundary observation, and specifically relates to a display method of an original austenite crystal boundary of steel for making a Co containing type ultra-supercritical set, which has the advantages of high alloy content, strong corrosion resistant performance, and good antioxidant property. The display method comprises the following steps: at first, grinding and polishing a sample of steel, which is used to produce a Co containing type ultra-supercritical set, subjecting the steel sample to chemical corrosion and electrolytic corrosion in sequence, and finally mechanically polishing the steel sample so as to clearly display the original austenite grain and crystal boundary. The provided method can completely and individually display the grains and crystal boundary of original austenite of steel for producing Co containing type ultra-supercritical set; thus the size and distribution of original austenite grains can be comprehensively displayed; and the problem that the size and uniformity of grains of steel for producing Co containing type ultra-supercritical set are hard to judge is solved.

Description

technical field [0001] The invention relates to the technical field of metallographic sample preparation and prior austenite grain boundary observation, in particular to a steel former austenite for a Co-containing ultra-supercritical unit with high alloy content, strong corrosion resistance and good oxidation resistance The grain boundary display method can obtain the complete prior austenite size and distribution in the process of evaluating the grain thickness and uniformity of the Co-containing ultra-supercritical unit steel, and finally obtain accurate inspection results. Background technique [0002] As we all know, the microstructure thickness and uniformity of steel have a great influence on various performance indicators of steel, and the evaluation of steel microstructure thickness and uniformity has important index significance in actual production. Co-containing ferritic heat-resistant steel is the fourth-generation casting steel for ultra-supercritical thermal p...

Claims

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Application Information

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IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 刘越马煜林刘春明古金涛屈光倪楠周玲
Owner NORTHEASTERN UNIV