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A Directional Solidification Process of Electroslag Metallurgy

A directional solidification and electroslag metallurgy technology, applied in the field of electroslag metallurgy, can solve the problems of unable to fully realize directional solidification, unable to meet directional solidification, large fluctuation of parameter voltage, etc. Small, computationally simple and easy-to-operate effects

Active Publication Date: 2020-07-28
丁信芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The accuracy control of the slag surface height of the domestic down-pumping electroslag furnace is >±6mm, which cannot meet the requirements of directional solidification. Since the control accuracy of the slag surface height directly affects the drastic change of the current in the melting process, the voltage fluctuation, the most important parameter of metal directional solidification, is large. , the process of directional solidification cannot be fully realized

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  • A Directional Solidification Process of Electroslag Metallurgy
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  • A Directional Solidification Process of Electroslag Metallurgy

Examples

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Embodiment 1

[0048] The present invention is equipped with an electroslag furnace, equipped with a magnetic modulation transformer and a main actuator, and the lifting system is composed of a servo motor and a ball screw.

[0049] A directional solidification process of electroslag metallurgy, comprising the following steps:

[0050] (1) Divide the base crystallizer into 4 sections along the height direction. The height of the crystallizer is 600mm, and every 150mm is a section from bottom to top. The crystallizer is conical, with a maximum diameter of 200mm and a minimum diameter of 180mm ; The diameter of the consumable electrode plate is 150mm; the following examples are medium and high carbon steel r 2.5; the calculated voltages are respectively 36V, 35V, 34.5V, 34V, 33.5V; the set currents are respectively 800A, 1500A, 3500 A, 5000 A, 6600 A; 800A-1500 A is the arc striking and slag melting current, 3500A, 5000 A is the transition current, the transition current is set according to ex...

Embodiment 2

[0074] The preparation process is the same as in Example 1, the difference being: the material of the consumable electrode and the gasket are the same, both are ASP30 steel; the ASP30 steel is a powder high-speed tool steel, from Figure 6 with Figure 7 It can be known that the ASP30 steel produced by the present invention meets the standard of powder high-speed tool steel in terms of crystal phase, and the traditional domestic method of fixed voltage and fixed current cannot produce high-speed tool steel of this standard.

[0075] Table 4 is the element percentage composition table of ASP30 steel, and the balance is iron;

[0076] Table 4

[0077] C Gr W Mo V co 1.28% 4.20% 6.40% 5.00% 3.20% 8.5%

Embodiment 3

[0079] The present invention is equipped with an electroslag furnace, equipped with a magnetic modulation transformer and a main actuator, and the lifting system is composed of a servo motor and a ball screw.

[0080] The preparation process is the same as that of Example 1, the difference is: the material of the consumable electrode and the gasket are the same, both are high manganese austenitic hot work die steel; Table 5 shows the high manganese austenitic hot work die steel electroslag The element percentage composition table of the ingot, the balance is iron;

[0081] table 5

[0082] C Si mn Gr Mo V 0.65% 0.85% 14.0% 3.2% 1.7% 1.7%

[0083] from Figure 8 It can be seen that the crystallization angle of the electroslag ingot of high manganese austenitic hot work die steel is ≤13°;

[0084] The electroslag ingot of high manganese austenitic hot work die steel has been forged and heat treated, and the electroslag ingot of high manganese aus...

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Abstract

The invention relates to an electroslag metallurgical directional solidification technology which comprises the following steps: dividing a crystallizer into multiple sections, calculating the voltageand current of each section, carrying out ignition with an arc striking agent, adding slag twice, wherein the adding amount of the slag for the first time is 2 / 3 of the total amount of the slag, andthe adding amount of the slag for the second time is 1 / 3 of the total amount of the slag, starting the power switch of electroslag, turning off the power switch of electroslag when a consumable electrode fuses to the required height, uplifting the consumable electrode, hoisting the crystallizer out after the material obtained after the consumable electrode in the crystallizer fuses is cooled, andfinishing smelting to obtain electroslag ingot. According to the electroslag metallurgical directional solidification technology, the existing equipment is utilized without purchasing equipment once more, the calculating and operating method is simple, and the obtained electroslag ingot is more densified.

Description

technical field [0001] The invention relates to the technical field of electroslag metallurgy, in particular to a directional solidification process of electroslag metallurgy. Background technique [0002] The directional solidification (crystallization) process of metal was born in the United States in the 1950s. At that time, the main purpose of developing metal directional solidification was to solve the service life and safety of turbine engine blades, and at the same time improve the impact resistance of the blades to obtain high Fatigue life and creep capacity. [0003] The typical process is: by controlling the solidification parameters of the metal, the rate of the solidification process is controlled, so that the metal material or alloy generates crystals along a fixed direction. The turbine engine blade made by the directional solidification process has made a leap in mechanical properties, especially the high-temperature thermal fatigue life, and the high-tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/10B22D27/04
CPCB22D23/10B22D27/045
Inventor 丁信芳
Owner 丁信芳