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Electrolytic corrosion method of high strength and high toughness Fe-Mn-C series twinning induced plasticity steel

A technology of twin-induced plasticity and electrolytic corrosion, applied in the field of surface treatment of high-strength and high-toughness steel, can solve the problems of inability to obtain metallographic structure, change electrochemical properties, etc., and achieve clear corrosion structure, good reproducibility, and outstanding details. Effect

Inactive Publication Date: 2011-02-16
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inventor tried to use this method to similarly prepare Fe-Mn-C TWIP steel, and found that it was almost impossible to obtain a normal metallographic structure
The reason may be that although the two steels belong to TWIP steel, the huge difference in the alloy composition of the two steels significantly changes the electrochemical performance.

Method used

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  • Electrolytic corrosion method of high strength and high toughness Fe-Mn-C series twinning induced plasticity steel
  • Electrolytic corrosion method of high strength and high toughness Fe-Mn-C series twinning induced plasticity steel
  • Electrolytic corrosion method of high strength and high toughness Fe-Mn-C series twinning induced plasticity steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] TWIP steel composition (by weight): 0.7% C, 17% Mn, and the rest are Fe and unavoidable impurities in the smelting process.

[0022] Experimental method: the first step, deploy corrosion electrolyte, measure perchloric acid, glacial acetic acid and glycerol by volume fraction (10% perchloric acid, 80% glacial acetic acid, 10% glycerol), inject electrolyzer and Stir evenly; in the second step, connect the TWIP steel sample to the anode of the electrolytic corrosion instrument, place it in the electrolyte together with the cathode of the electrolytic corrosion instrument, keep the distance between the cathode and the anode at 5cm, apply a working voltage of 30V, and a current density of 0.5A / cm2 , and use a stirrer to stir the electrolyte at a constant speed; the corrosion time is 120s. After the end, take out the sample, immediately put it in distilled water and ultrasonically clean it for 10s to remove the residual electrolyte, then rinse it with absolute ethanol and dry...

Embodiment 2

[0025] TWIP steel composition (by weight): 0.2% C, 24% Mn, and the rest are Fe and unavoidable impurities in the smelting process.

[0026] Experimental method: the first step is to prepare the corrosion electrolyte, measure the perchloric acid and glacial acetic acid according to the volume fraction (10% perchloric acid, 90% glacial acetic acid), inject them into the electrolytic tank and stir them evenly; the second step is to put the TWIP steel The sample is connected to the anode of the electrolytic corrosion instrument, placed in the electrolyte with the cathode of the electrolytic corrosion instrument, the distance between the cathode and the anode is kept 1cm, the applied working voltage is 45V, the current density is 1.5A / cm2, and the electrolyte is stirred at a constant speed with a stirrer; The time is 30s. After the end, take out the sample, put it in distilled water and ultrasonically clean it for 10s to remove the residual electrolyte, then rinse it with absolute e...

Embodiment 3

[0029] TWIP steel composition (by weight): 0.45% C, 21% Mn, and the rest are Fe and unavoidable impurities in the smelting process.

[0030] Experimental method: the first step, deploy corrosion electrolyte, measure perchloric acid, glacial acetic acid and glycerol by volume fraction (10% perchloric acid, 85% glacial acetic acid and 5% glycerol), inject electrolyzer and Stir evenly; in the second step, connect the TWIP steel sample to the anode of the electrolytic corrosion instrument, place it in the electrolyte together with the cathode of the electrolytic corrosion instrument, keep the distance between the cathode and the anode at 3cm, apply a working voltage of 37V, and a current density of 1A / cm2, And use a stirrer to stir the electrolyte at a constant speed; the corrosion time is 85s. After the end, take out the sample, put it in distilled water and ultrasonically clean it for 10s to remove the residual electrolyte, then rinse it with absolute ethanol and dry it with cold...

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Abstract

The invention discloses an electrolytic corrosion method of high strength and high toughness Fe-Mn-C series twinning induced plasticity (TWIP) steel. The steel is the second generation of the TWIP steel and is suitably used in the car impact resistant structural component and in other fields. The steel contains the following chemical components by weight percent: 0.2-0.7% of C, 17-24% of Mn and the balance Fe and inevitable impurities generated by the smelting process. The electrolytic corrosion method is characterized in that the electrolytic corrosion liquid is the mixed solution of 10% of perchloric acid, 80%-90% of glacial acetic acid and 0-10% of glycerol by volume, the working voltage is 30-45V; the current density is 0.5-1.5A / cm<2>, the corrosion time is 30-120s, the temperature of the corrosion liquid is 10-50 DEG C and the distance between the cathode and the anode is 1-5cm. The method of the invention is simple and practical and has good repeatability; the surface of the prepared TWIP steel does not have scratches and the surface deformations caused by polishing deformation such as the disturbing layer and the deformation twin, and the TWIP steel of the invention can satisfy the experimental requirements of the metallurgical phase, the type analysis of grain boundary, the strain test and the texture measurement on different sizes of Fe-Mn-C series TWIP steel samples.

Description

technical field [0001] The invention belongs to the field of surface treatment of high-strength and high-toughness steel, and relates to an electrolytic corrosion method for high-strength and high-toughness Fe-Mn-C series twinning-induced plasticity steel. Background technique [0002] Due to considerations of cost, energy, safety, and the environment, automobile lightweight is the development direction of the modern automobile industry. The pursuit of high strength and high plasticity has become a trend in the design and research of automotive steel in the future. In recent years, major iron and steel enterprises and research departments in the world have carried out concentrated research and developed a series of high-strength and high-toughness automotive steels, such as dual-phase steels, phase transformation-induced plasticity steels, and twinning-induced plasticity steels (TWIP steels), among which The overall performance of TWIP steel is the best, and its strength-pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/06C22C38/04
Inventor 刘嘉斌刘向海舒康颖刘薇
Owner CHINA JILIANG UNIV
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