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A kind of var smelting method for preparing full columnar crystal titanium alloy ingot

A titanium alloy and columnar crystal technology is applied in the field of VAR smelting for preparing full columnar crystal titanium alloy ingots, which can solve the problems of uneven structure in the edge and core of the bar and many forging times, and achieve the effect of solving the coarse solidification structure.

Active Publication Date: 2022-05-13
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention proposes a VAR smelting method for preparing a full columnar crystal titanium alloy ingot. Through this preparation method, a titanium alloy ingot with a vertical full columnar crystal can be obtained and the deviation of the main element content can be controlled within 2000ppm. Ingot, which effectively improves the problem of too many forging fires and uneven structure at the edge and center of the bar caused by the uneven structure of the transverse edge and center of the titanium alloy ingot, and is suitable for industrial production

Method used

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  • A kind of var smelting method for preparing full columnar crystal titanium alloy ingot
  • A kind of var smelting method for preparing full columnar crystal titanium alloy ingot
  • A kind of var smelting method for preparing full columnar crystal titanium alloy ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Put the secondary VAR melting Ti1023 alloy ingot with a weight of 1600kg and a specification of Φ440mm into a Φ520mm crucible, and place it in the melting station of the VAR furnace to seal the furnace and evacuate it. The water flow rate of the melting station is set to 1000L / min;

[0019] Step 2: When the pre-vacuum is ≤5Pa and the leakage rate is ≤1.0Pa / min, butt-weld the consumable electrode and the auxiliary electrode, and after cooling for 45 minutes, turn on the furnace to clean up the weld bumps, and then seal the furnace and evacuate after cleaning;

[0020] Step 3: When the pre-vacuum is ≤1Pa and the leakage rate is ≤0.6Pa / min, start arc melting. The melting voltage range is 28-30V, the melting current range is 10-14kA, and the arc-stabilizing current range is 5-10A AC. The arc stabilization period ranges from 6 to 10s.

[0021] Step 4: Start feeding when the remaining weight of the consumable electrode is 150kg. In the early stage of feeding, when th...

Embodiment 2

[0027] Step 1: Put the secondary VAR melting TC4 ingot with a weight of 5000kg and a specification of Φ640 into a Φ720mm crucible, and place it in the melting station of the VAR furnace to seal the furnace and evacuate it. Station water flow is set to 1200L / min;

[0028] Step 2: When the pre-vacuum is ≤5Pa and the leakage rate is ≤1.0Pa / min, butt-weld the consumable electrode and the auxiliary electrode, and after cooling for 45 minutes, turn on the furnace to clean up the weld bumps, and then seal the furnace and evacuate after cleaning;

[0029] Step 3: When the pre-vacuum is ≤1Pa and the leakage rate is ≤0.6Pa / min, start arc melting. The melting voltage range is 36-38V, the melting current range is 14-18kA, and the arc-stabilizing current range is 10-14A AC. The arc stabilization period ranges from 3 to 7s.

[0030] Step 4: Start feeding when the remaining weight of the consumable electrode is 350kg. In the early stage of feeding, when the current is greater than 8kA, the ...

Embodiment 3

[0037] Step 1: Put the secondary VAR melting Ti1023 ingot with a weight of 3500kg and a specification of Φ560mm into a Φ640mm crucible, and place it in the melting station of the VAR furnace to seal the furnace and evacuate it. Set the inlet water temperature of the melting station to 20°C and melt Station water flow is set to 1100L / min;

[0038] Step 2: When the pre-vacuum is ≤5Pa and the leakage rate is ≤1.0Pa / min, butt-weld the consumable electrode and the auxiliary electrode, and after cooling for 45 minutes, turn on the furnace to clean up the weld bumps, and then seal the furnace and evacuate after cleaning;

[0039] Step 3: When the pre-vacuum is ≤1Pa and the leakage rate is ≤0.6Pa / min, start arc melting, where the melting voltage range is 28-30V, the melting current range is 8-12kA, and the arc-stabilizing current range is 8-13A AC. The arc stabilization period ranges from 3 to 7s.

[0040] Step 4: Start feeding when the remaining weight of the consumable electrode is...

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Abstract

A VAR smelting method for preparing a full columnar crystal titanium alloy ingot. The second VAR smelted titanium alloy ingot is used as a consumable electrode for another vacuum arc melting; during the preparation process, the inlet water temperature and flow rate are controlled, and the The feeding stage is divided into the first, middle and last stages to reduce the melting current rate in stages, and to improve the quality of the alloy ingot by controlling the ingot cooling process and the size of the molten pool. The preparation method of the present invention can obtain a titanium alloy ingot with vertical full columnar crystals, and the deviation of the main element content can be controlled within the range of 2000ppm, which effectively improves the forging failure caused by the inhomogeneity of the transverse edge and center of the titanium alloy ingot. Many, the problem of uneven structure at the edge and center of the bar is suitable for industrial production.

Description

technical field [0001] The invention relates to a VAR smelting method for a full columnar crystal titanium alloy ingot, which belongs to the field of non-ferrous metal processing, and is suitable for producing an industrialized titanium alloy ingot with a whole columnar crystal and uniform structure and composition, especially a method using vacuum self-consumption The manufacturing method of electric arc furnace melting. Background technique [0002] Titanium alloy is a key metal material developed in the 1950s. Because of its high specific strength, excellent corrosion resistance, and high thermal strength, it is widely used in petroleum, chemical, ship, metallurgy and other fields. One of the materials of choice for advanced aircraft structures and engine rotating parts. [0003] During the smelting of titanium alloy VAR (vacuum arc melting), under the conventional smelting process, due to the characteristics of fast cooling at the edge of the molten pool and slow coolin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C14/00C22B9/20
CPCC22C1/02C22C14/00C22B9/20
Inventor 刘向宏付杰吴明何永胜王凯旋同朴超李军仁罗文忠冯勇张丰收张平祥
Owner 西部超导材料科技股份有限公司
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