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Method for improving carbon steel solidification structure using high voltage electropulse

A technology of high-voltage electric pulse and solidification structure is applied in the field of improving the coarse grains in the solidification structure, which can solve the problems of small electric parameters in electric pulse processing, and achieve the effects of convenient operation, simple equipment and low investment.

Inactive Publication Date: 2009-02-04
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are few studies on high-melting-point metals such as iron and steel materials, and the electric parameters selected for electric pulse treatment are small, and the pulse voltage is generally around 1000V, and there is almost no experimental research on the influence of electric pulses on the microscopic solidification structure and mechanical properties of carbon steel.

Method used

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  • Method for improving carbon steel solidification structure using high voltage electropulse
  • Method for improving carbon steel solidification structure using high voltage electropulse
  • Method for improving carbon steel solidification structure using high voltage electropulse

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Effect test

Embodiment 1

[0020] The material of this embodiment is 45 steel (its main chemical composition is: 0.43%C, 0.58%Mn, 0.22%Si, 0.003%S, 0.02%P), which is melted in an intermediate frequency induction furnace to make the molten steel temperature reach about 1540°C, And keep it warm for 5 minutes to make the composition and temperature of molten steel uniform. After deoxidizing with aluminum wire, cast it into a square mold (dimensions 75×75×75mm) combined with heat insulating boards in advance 3 ), start the pulse signal generator, and perform electric pulse processing until the molten steel is completely solidified. The main electrical parameters are: voltage 2600V, frequency 0.86Hz (charging time 0.73s, discharging time 0.43s), capacitor capacitance 200μF. Figures (a) and (b) are the macroscopic solidification structures of 45 steel without electric pulse treatment and with 2600V electric pulse treatment respectively. It can be clearly seen from the figure that after electric pulse treatmen...

Embodiment 2

[0022] The material of this embodiment is 45 steel (its main chemical composition is: 0.43%C-0.58%Mn-0.22%Si-0.003%S-0.02%P), the pre-weighed 45 steel is added to the intermediate frequency induction furnace, and the power is carried out Heat and melt to make the temperature of the molten steel reach about 1540°C, and keep it warm for 5 minutes to make the composition and temperature of the molten steel uniform. After deoxidizing with aluminum wire, directly insert the electrode into the molten steel of the induction furnace, turn off the power switch of the induction furnace, and then start the pulse signal generator , the main electrical parameters are: voltage 2900V, frequency 0.96Hz (charging time 0.73s, discharging time 0.43s), capacitor capacitance 300μF, electric pulse treatment before solidification, treatment time is 60s, and the treated molten steel is cast into pre-used In the square mold of the heat insulation board combination (the size is 75×75×75mm 3 ). image ...

Embodiment 3

[0024] The material of this embodiment is 30Mn steel (its main chemical composition is: 0.28%C-0.84%Mn-0.32%Si-0.028%S-0.032%P), and the 30Mn steel is first melted with a medium frequency induction furnace (CW-1JJ) , so that the temperature of the molten steel reaches about 1560 ° C, and keep it warm for 5 minutes, deoxidize it with aluminum wire and cast it into a heat insulation board mold with good heat preservation effect, insert the electrode quickly, turn on the pulse signal generator for electric pulse processing, until the molten steel is completely solidified until. The parameters of the pulse signal generator are: the pulse voltage is 3670V, the frequency is 1.14Hz (charging time 0.58s, discharging time 0.30s), and the capacitance of the capacitor is 500μF.

[0025] Figure 4 (a) and (b) are the macroscopic solidification structures of 30Mn steel without electric pulse treatment and with 3670V electric pulse treatment, respectively. It can be clearly seen from the ...

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Abstract

The invention discloses a method for improving the carbon steel solidification structure by adopting high voltage electrical pulse. The method is that in a continuous casting tundish and a continuous casting mould or a moulded casting mould, a selected high voltage electrical pulse is applied to the carbon steel solidification process or before carbon steel solidifying; the high voltage electrical pulse has the following parameters: the pulsed voltage is from 1000V to 3900V, the pulse rate is from 0.50Hz to 1.5Hz, and the pulse capacitor is from 100 microfarad to 500 microfarad. The method is especially suitable for steel grades to improve large coarse grains in the solidification structure, developed dendrite and easy generation of composition segregation, can increase the nucleation rate of metal solidification, reduce dendrite, increase equiaxed grains, reduce the internal cracks, the shrinkage holes and the loose of the solidification structure, and improve the composition segregation; and the mechanical properties of the processed steel are improved.

Description

technical field [0001] The invention relates to a method for improving the solidification structure and performance of carbon steel by high-voltage electric pulses, and is especially suitable for improving the steel types in the solidification structure with coarse crystal grains, developed dendrites, and easy composition segregation. Background technique [0002] At the end of the last century, the concept of a new generation of steel materials (super steel) was proposed, which has attracted great attention from all over the world. The method is mainly by controlling the chemical composition of steel (microalloying), microstructure, solid state deformation and grain Refinement and so on to achieve. The core technology is grain refinement, that is, ultra-fine grain technology. By refining the current steel grain size by an order of magnitude, the strength of steel materials can be doubled while maintaining good plasticity and toughness. However, applying a selected high-vol...

Claims

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Application Information

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IPC IPC(8): C21D10/00B22D11/115
Inventor 袁守谦张西锋杨拉道魏颖娟王超
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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