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Method for obtaining intergranular fractures in oriented silicon steel

A technology of oriented silicon steel and fracture, which is applied in the field of preparation of iron and steel material analysis samples, can solve the problems of chronic poisoning or acute poisoning, hinder grain boundary migration and grain growth, etc., achieve short time consumption, improve brittleness, and improve permeability Effect

Pending Publication Date: 2021-05-28
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] The problem of grain boundary segregation in grain-oriented silicon steel has been widely concerned by material scientists, mainly because some elements such as Sn, Sb and Bi are easily enriched at grain boundaries, hindering the migration of grain boundaries and the growth of grains. This can improve the strength of the inhibitor in grain-oriented silicon steel and promote the development of secondary recrystallization, but the relevant mechanism needs further research
Improper use can lead to accidents such as chronic poisoning or acute poisoning

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  • Method for obtaining intergranular fractures in oriented silicon steel

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Embodiment 1

[0028] A method for obtaining intergranular fractures in grain-oriented silicon steel, the steps of which are:

[0029] 1) Process the grain-oriented silicon steel sample into a standard sample of the Auger electron spectrometer;

[0030] 2) Clean the surface of the processed standard sample, that is, immerse the sample in alcohol and perform ultrasonic cleaning. The cleaning time is controlled at 15 minutes; then rinse with deionized water and dry;

[0031] 3) Carry out hydrogen charging

[0032] Put the preset fracture set by the standard sample into the thiourea mixed solution of the hydrogen charging device, and make the oriented silicon steel sample as the cathode; put the platinum sheet in and use it as the anode; the cathode hydrogen charging current is 1.3A, Hydrogen charging current density at 0.5A / m 2 , hydrogen charging time is 48h, hydrogen charging voltage is 38V;

[0033] 4) Carry out pressure breaking

[0034] The standard sample after hydrogen charging was ...

Embodiment 2

[0039] A method for obtaining intergranular fractures in grain-oriented silicon steel, the steps of which are:

[0040] 1) Process the grain-oriented silicon steel sample into a standard sample of the Auger electron spectrometer;

[0041] 2) Clean the surface of the processed standard sample, that is, immerse the sample in alcohol and perform ultrasonic cleaning. The cleaning time is controlled at 11 minutes; then rinse with deionized water and dry;

[0042] 3) Carry out hydrogen charging

[0043] Put the preset fracture set by the standard sample into the thiourea mixed solution of the hydrogen charging device, and make the oriented silicon steel sample as the cathode; put the platinum sheet in and use it as the anode; the cathode hydrogen charging current is 1.25A, Hydrogen charging current density at 0.3A / m 2 , hydrogen charging time is 24h, hydrogen charging voltage is 36V;

[0044] 4) Carry out pressure breaking

[0045] The standard sample after hydrogen charging was...

Embodiment 3

[0051] A method for obtaining intergranular fractures in grain-oriented silicon steel, the steps of which are:

[0052]1) Process the grain-oriented silicon steel sample into a standard sample of the Auger electron spectrometer;

[0053] 2) Clean the surface of the processed standard sample, that is, immerse the sample in alcohol and perform ultrasonic cleaning. The cleaning time is controlled at 20 minutes; then rinse with deionized water and dry;

[0054] 3) Carry out hydrogen charging

[0055] Put the preset fracture set by the standard sample into the thiourea mixed solution of the hydrogen charging device, and make the oriented silicon steel sample as the cathode; put the platinum sheet in and use it as the anode; the cathode hydrogen charging current is 1.35A, Hydrogen charging current density at 0.6A / m 2 , the hydrogen charging time is 50h, and the hydrogen charging voltage is 39V;

[0056] 4) Carry out pressure breaking

[0057] The standard sample after hydrogen c...

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Abstract

The invention discloses a method for obtaining intergranular fractures in oriented silicon steel. The method comprises the following steps of: processing an oriented silicon steel sample into an Auger electron spectrometer standard sample; cleaning the surface of the standard sample; carrying out hydrogen charging, namely putting a preset fracture of the standard sample into a thiourea-containing solution of a hydrogen charging device, and taking the oriented silicon steel sample as a cathode; placing a platinum sheet and taking the platinum sheet as an anode; performing hydrogen charging on the cathode for 12-50 h at the hydrogen charging current of 1.25-1.35 A, the hydrogen charging current density of 0.1-0.8 A / m<2> and the hydrogen charging voltage of 36-39 V; and performing surface analysis. The method is simple in process, convenient to operate and short in consumed time, the used poisoning agent is thiourea, so that the problem that extremely toxic arsenic trioxide is adopted as the poisoning agent, and the human health is greatly threatened is solved, the obtained fractures of the oriented silicon steel are typical intergranular fractures, and the method is suitable for grain boundary segregation behavior and grain boundary microcell component analysis of the oriented silicon steel.

Description

technical field [0001] The invention relates to a method for preparing a steel material analysis sample, in particular to a method for obtaining intergranular fractures in oriented silicon steel. Background technique [0002] The problem of grain boundary segregation in grain-oriented silicon steel has been widely concerned by material scientists, mainly because some elements such as Sn, Sb and Bi are easily enriched at grain boundaries, hindering the migration of grain boundaries and the growth of grains. Thus, the strength of the inhibitor in grain-oriented silicon steel can be improved and the development of secondary recrystallization can be promoted, but the related mechanism needs further research. Generally, surface analysis devices such as Auger electron spectroscopy can be used to analyze the grain boundary segregation behavior and the composition of grain boundary microdomains, but this requires clean intergranular fractures. For general iron and steel materials, ...

Claims

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Application Information

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IPC IPC(8): G01N23/2202
CPCG01N23/2202
Inventor 鲍思前雷小玲徐帅肖欢徐耀文杨庚蔚叶传龙甘晓龙
Owner WUHAN UNIV OF SCI & TECH
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