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Treatment method for improving iron casting frozen tissue

A treatment method and solidification structure technology, which is applied in the field of improving the solidification structure of cast iron, can solve the problems of unsatisfactory temperature field and composition homogenization, insignificant refinement, and metal liquid pollution, etc., to achieve solidification Clear organization, simple and convenient process operation, energy saving effect

Inactive Publication Date: 2005-02-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, compared with the common solidification method, this method does not significantly change the nucleation rate of crystal nuclei, so the refinement effect is not obvious
Secondly, strong stirring makes the molten metal turn up and down, which is also easy to get involved in air and other oxidized inclusions, which will inevitably pollute the molten metal
Furthermore, the stirring is limited by its stirring intensity, and the effect on the homogenization of the temperature field and components is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1: Sand casting the molten iron into a cylindrical iron rod with a diameter of 50×200 mm. After pouring, pulse current treatment is performed on the molten iron during the solidification process until the solidification of the molten iron is completed.

[0007] The composition and content (weight percentage) of cast iron are: C 4.10%, Si 1.92%, Mn 0.22%, P0.058%, S 0.023%, Fe balance, the temperature at which the molten iron begins to be processed is 1250 ° C, when the temperature drops to When the temperature is 1000°C, the energization treatment is stopped; the process parameters are as follows: the pulse frequency is 0.8Hz, the output voltage U is 2000V, and the current intensity I is 30000A.

Embodiment 2

[0008] Embodiment 2: The test process is exactly the same as that of Embodiment 1, and the chemical composition and content (weight percent) of the cast iron are also the same. However, different process parameters are used. The process parameters are: pulse frequency 1000Hz, output voltage U is 50V, and current intensity I is 800A.

Embodiment 3

[0009] Example 3: The test process is exactly the same as Example 1. The composition and content (weight percentage) of cast iron are: C 3.58%, Si 1.60%, Mn 0.18%, P 0.045%, S 0.020%, Fe balance, iron The temperature at the beginning of the liquid treatment is 1250°C. When the temperature drops to 1000°C, the energization treatment is stopped; the process parameters are as follows: the pulse frequency is 0.1Hz, the output voltage U is 5000V, and the current intensity I is 100000A.

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PUM

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Abstract

The cast iron solidifying structure improving method features that to grey cast iron with carbon equivalent of 2.5-5.0 %, pulse current is led in before and during cast iron solidification while the cast iron temperature is 1000 deg.c to 1500 deg.c. The pulse current parameters includes pulse frequency of 0.1-10000 Hz, pulse voltage of 50-5000 V, and pulse current peak value of 400-100,000 A. The current may be led into the crucible or ladle or in the cast mold.

Description

technical field [0001] The invention relates to a treatment method for improving the solidification structure of cast iron, and belongs to the technical field of thermal processing of metal materials. Background technique [0002] In order to change the solidification structure of cast iron, obtain uniform and refined graphite, and at the same time prevent whitening of cast iron, there are three main measures taken in the production process of castings or billets at home and abroad: one is chemical method, that is, before the solidification of cast iron, the Chemical substances such as ferrosilicon, rare earth or magnesium are added to the molten iron to achieve the purpose of inoculation, spheroidization or vermicularization, so that the cast iron can avoid white mouths, and the precipitated graphite is uniform and small, or the shape of the graphite is changed to make the graphite spherical. or worm-like. These substances change the shape of graphite by changing the therm...

Claims

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Application Information

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IPC IPC(8): B22D27/02
Inventor 翟启杰范金辉陈宇富知愚华勤李仁兴侯旭李祖齐
Owner SHANGHAI UNIV
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