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Electroslag metallurgical directional solidification technology

A directional solidification and electroslag metallurgy technology, applied in the field of electroslag metallurgy, can solve the problems of large parameter voltage fluctuation, unable to fully realize directional solidification, unable to meet directional solidification and other problems, and achieve smaller segregation degree and eutectic carbide size change. Small, computationally simple and easy-to-operate effects

Active Publication Date: 2018-09-18
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

Method used

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  • Electroslag metallurgical directional solidification technology
  • Electroslag metallurgical directional solidification technology
  • Electroslag metallurgical directional solidification technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The invention is equipped with an electroslag furnace, equipped with a magnetic tuning 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 includes the following steps:

[0050] (1) The pedestal crystallizer is divided into 4 sections along the height direction. The height of the crystallizer is 600mm, and one section is 150mm from bottom to top. The crystallizer is cone-shaped, with a maximum diameter of 200mm and a minimum diameter of 180mm. The diameter of the consumable electrode plate is 150mm; the following example is for medium and high carbon steel r to take 2.5; the calculated voltages are 36V, 35V, 34.5V, 34V, 33.5V; the set currents are 800A, 1500 A, 3500 A, 5000 A, 6600 A; 800A-1500 A is the arc ignition and slagging current, and the transition current is from 3500A and 5000 A. The transition current is set based on experience. The normal wor...

Embodiment 2

[0074] The preparation process is the same as in Example 1. The difference is: the material of the consumable electrode and the gasket are the same, both of ASP30 steel; ASP30 steel is powder high-speed tool steel, from Image 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 domestic traditional fixed voltage and fixed current method cannot produce this standard high-speed tool steel.

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

[0076] Table 4

[0077] C

Embodiment 3

[0079] The invention is equipped with an electroslag furnace, equipped with a magnetic tuning 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 in Example 1. The difference is: the material of the consumable electrode and the gasket are the same, both are high manganese austenite hot work die steel; Table 5 is high manganese austenite hot work die steel electroslag The composition table of the element percentage 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 high manganese austenite hot working die steel electroslag ingot is ≤13°;

[0084] High-manganese austenitic hot-working die steel electroslag ingots are forged and heat-treated, and high-manganese austenitic hot-working die steel electroslag ingots pass the post-heat treatment process. T...

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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 the research and development of directional solidification of metal 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 ability. [0003] The typical process is to control the rate of the solidification process by controlling the solidification parameters of the metal, so that the metal material or alloy can generate crystals in a fixed direction. Turbine engine blades made by the directional solidification process have made a leap in mechanical properties, especially the high-temperature thermal fatigue life, and the hig...

Claims

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Application Information

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