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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, continuous production, and small footprint.

Inactive Publication Date: 2010-10-27
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.

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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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Embodiment 1

[0020] The material of this embodiment is 45 steel (the main chemical components are: 0.43% C, 0.58% Mn, 0.22% Si, 0.003% S, 0.02% P), which is melted by an intermediate frequency induction furnace to make the molten steel temperature reach about 1540°C. And keep the temperature for 5min to make the molten steel composition and temperature uniform. After deoxidizing with aluminum wire, it is cast into a square mold (dimension 75×75×75mm 3 ), start the pulse signal generator and conduct electrical 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), and capacitor capacity 200μF. Figures (a) and (b) are the macroscopic solidification structure of 45 steel without electric pulse treatment and after 2600V electric pulse treatment. It can be clearly seen from the figure that after the electrical pulse treatment, the coarse dendrites are refined into fine and...

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 it is energized. Heat and melt the molten steel so that the temperature of the molten steel reaches about 1540℃, and keep it 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 induction furnace power switch, 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 60s, and cast the treated molten steel to pre-use In the square mold of the combination of thermal insulation board (size 75×75×75mm 3 ). image 3 (a) and (b) are...

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), first use an intermediate frequency induction furnace (CW-1JJ) to melt the 30Mn steel , Make the temperature of molten steel reach about 1560℃, keep it for 5min, deoxidize with aluminum wire and cast into a heat-insulating plate mold with better heat preservation effect, quickly insert the electrode, turn on the pulse signal generator for electric pulse treatment, 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 (charge time 0.58s, discharge time 0.30s), and the capacitor capacitance is 500μF.

[0025] Figure 4 (a) and (b) are the macroscopic solidification structure of 30Mn steel without electric pulse treatment and 3670V electric pulse treatment. It can be clearly seen from the figure that after the electric pulse treatment, the coarse dendri...

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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 isespecially 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 particularly suitable for improving the steel grades with coarse crystal grains, developed dendrites, and component segregation in the solidification structure. Background technique [0002] At the end of the last century, the concept of a new generation of steel materials (super steels) was proposed, which has attracted great attention from all over the world. The method is mainly to control the chemical composition of the steel (microalloying), microstructure morphology, solid-state deformation and crystal grains. 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. The application of a sel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115C21D10/00
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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