Electrolytic polishing method for high-strength hot rolling low carbon twinning induced plasticity (TWIP) steel

Abstract

The invention relates to an electrolytic polishing method for a high-strength hot rolling low carbon twinning induced plasticity (TWIP) steel (comprising 25-33 percent of Mn, 2.3-2.55 percent of Si, 2-4 percent of Al, 0.005-0.02 percent of C and the balance of Fe). According to the method, an electrolytic polishing solution is a sand extracting solution (comprising the following components in percentage by mass: 20 percent of perchloric acid, 10 percent of glycerin and 70 percent of alcohol), and the voltage is 18-28V, the current density is 0.9-1.9A/cm2, the polishing time is 50-150S and the polishing solution temperature is 25-40 DEG C. The method does not generate a deformed twin crystal caused by stress strain in the electrolytically polished texture, the electrolytically polished metal surface is smooth and bright like a mirror face, and the method is widely applied to various occasions needing electrolytic polishing, such as low carbon TWIP steel metallographic phases in different dimensions, texture, stress tests, and the like in a laboratory. The invention belongs to the field of electrolytic polishing of high-strength steel.

Description

technical field [0001] The invention relates to the field of high-strength steel electrolytic polishing, in particular to an electrolytic polishing method for a novel high-strength hot-rolled low-carbon twinning induced plasticity steel (TWIP steel). "TWIP" is the abbreviation of Twinning Induced Plasticity. TWIP steel refers to "twin induced plasticity" steel. The main feature is high manganese content. TWIP steel will also produce deformation twins under the action of small stress and strain, thereby changing the structure and properties of TWIP steel. Therefore, when the laboratory observes its original tissue or conducts related tests without external stress (such as back-projection electron diffraction test, X-ray stress detection), electropolishing without stress and strain is required to ensure that the polished tissue is the original tissue, And there is no deformation layer caused by polishing. Background technique [0002] In 1997, Grassel et al. observed when st...

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Problems solved by technology

[0003] In the experimental research of TWIP steel, it is necessary to observe the original structure of TWIP steel, conduct electron back diffraction and X-ray stress testing, and TWIP steel will produce deformation twins due to stress and strain during mechanical polishing, which will change the structure of TWIP steel and generate stress layers. , affecting the authenticity of original tissue observation and the accuracy of experimental testing

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