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Method for controlling solidified structure of ultra-high carbon steel

A technology of ultra-high carbon steel and solidification structure, applied in the field of control of ultra-high carbon steel solidification structure, can solve the problems of high cost, complicated technical process, high energy consumption, etc., and achieve the effect of inhibiting the formation

Inactive Publication Date: 2018-07-27
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although secondary processing such as thermomechanical processing and multiple heat treatments can improve the as-cast st

Method used

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  • Method for controlling solidified structure of ultra-high carbon steel
  • Method for controlling solidified structure of ultra-high carbon steel
  • Method for controlling solidified structure of ultra-high carbon steel

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Experimental program
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Embodiment 1

[0015] Embodiment 1: Method for controlling the solidification microstructure of ultra-high carbon steel

[0016] 1) Preparation of amorphous modifier: select a commercially available rare earth (45-70)%-silicon calcium (55-30)% composite modifier, put it into a vacuum furnace and melt it, and melt the molten composite modifier It is led through the flow channel to a water-cooled tank with a rotation speed of 35m / s and a temperature of 15°C for quenching and solidification to obtain amorphous modifier particles.

[0017] 2) Material smelting: For ultra-high carbon steel with a composition of Fe-1.75C-0.32Si-1.45Cr-0.5Mn-0.3Al, industrial pure iron, ferrochrome and ferromanganese with a purity of 99.9% are selected as raw materials. Smelting is carried out in an intermediate frequency induction furnace at a temperature of 1490°C, and it is left to stand for 4 minutes after deoxidation and slag removal.

[0018] 3) Casting: when the melt temperature is 1470°C, pour the melt in ...

Embodiment 2

[0021] 1) Preparation of amorphous modifier: select a commercially available rare earth (45-70)%-silicon calcium (55-30)% composite modifier, put it into a vacuum furnace and melt it, and melt the molten composite modifier It is led through the flow channel to a water-cooled tank with a rotation speed of 40m / s and a temperature of 20°C for quenching and solidification to obtain amorphous modifier particles.

[0022] 2) Material smelting: For ultra-high carbon steel with a composition of Fe-1.8C-0.35Si-1.5Cr-0.55Mn-0.35Al, industrial pure iron, ferrochrome and ferromanganese with a purity of 99.9% are selected as raw materials. Smelting is carried out in an intermediate frequency induction furnace at a temperature of 1500°C, and it is left to stand for 5 minutes after deoxidation and slag removal.

[0023] 3) Casting: when the melt temperature is 1480°C, pour the melt in step 2) into a metal mold, and add 0.15wt.% (accounting for the weight percentage of molten steel) step 1 )...

Embodiment 3

[0026] 1) Preparation of amorphous modifier: select a commercially available rare earth (45-70)%-silicon calcium (55-30)% composite modifier, put it into a vacuum furnace and melt it, and melt the molten composite modifier It is led through the flow channel to a water-cooled tank with a rotation speed of 45m / s and a temperature of 25°C for quenching and solidification to obtain amorphous modifier particles.

[0027] 2) Material smelting: For ultra-high carbon steel with a composition of Fe-1.85C-0.38Si-1.55Cr-0.6Mn-0.4Al, industrial pure iron, ferrochrome and ferromanganese with a purity of 99.9% are selected as raw materials. Melting in an intermediate frequency induction furnace at a temperature of 1510°C, after deoxidation and slag removal, stand still for 6 minutes;

[0028] 3) Pouring: when the temperature of the melt is 1490°C, pour the melt into a metal mold, and add 0.2wt.% (accounting for the weight percentage of the molten steel) of the non- Crystalline modifier par...

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Abstract

A method for controlling a solidified structure of ultra-high carbon steel comprises the following steps: 1) selecting a commercialized rare earth (45-70)%-silicon calcium (55-30)% composite modifier,melting in a vacuum furnace, introducing into a water cooling trough with the temperature of 15-25 DEG C at a rotating speed of 30-45 m/s through a runner, chilling, and solidifying to obtain amorphous modifier particles; 2) selecting industrial pure iron, ferrochrome, ferromanganese and the like with the purity of 99.9% as raw material, smelting in a medium frequency induction furnace, and allowing the obtained melt to stand for 2 min-8 min after deoxidizing drossing; and 3) keeping the melt temperature at 1450-1550 DEG C, pouring the molten liquid into a metal mold, and adding the amorphousmodifier particles by a pressing method in the pouring process. According to the method, the material is subjected to modification treatment by addition of the amorphous modifier in a thermodynamic non-stable state, so the precipitation of dendrite austenite can be effectively controlled and the formation of coarse reticulated eutectic lastecreite is effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of controlling the solidification microstructure of ultra-high carbon steel. Background technique [0002] Ultra-high carbon steel is an iron-based alloy with a carbon content between high carbon steel and cast iron. In the conventional solidification process, austenite is mostly precipitated in the form of dendrites, and coarse network eutectic ledeburite is formed between the dendrites. Therefore, controlling the precipitation of dendritic austenite during solidification and inhibiting the formation of reticular eutectic ledeburite is the key to enable ultra-high carbon steel to be used in engineering applications. Although secondary processing such as thermomechanical processing and multiple heat treatments can improve the as-cast structure and mechanical properties of ultra-high carbon steel, these technologies are complex, energy-intensive and costly. In recent years, the method of using modification ...

Claims

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Application Information

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IPC IPC(8): C22C33/06B22D27/20
CPCC22C33/06B22D27/20
Inventor 王芳刘庆锁张鑫王惠斌
Owner TIANJIN UNIVERSITY OF TECHNOLOGY