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Method for controlling solidification structure of large-size TC4-DT titanium alloy ingot

A technology of TC4-DT and solidification structure, which is applied in the field of titanium alloy processing, can solve the problems of difficult grain breaking and coarse structure, and achieve the effect of uniform composition and structure of the ingot, and solve the effect of coarse solidification structure

Active Publication Date: 2017-09-19
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

[0003] The purpose of the present invention is to provide a method for controlling the solidification structure of large-scale TC4-DT titanium alloy ingots, which solves the problem that the existing large-scale TC4-DT titanium alloy ingots with large specifications of Φ720 mm to Φ1000 mm have coarse solidification structures and difficult grain breakage in the forging process.

Method used

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  • Method for controlling solidification structure of large-size TC4-DT titanium alloy ingot
  • Method for controlling solidification structure of large-size TC4-DT titanium alloy ingot
  • Method for controlling solidification structure of large-size TC4-DT titanium alloy ingot

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Experimental program
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Effect test

Embodiment 1

[0035] Step 1: Combine the national standard sponge titanium, aluminum vanadium master alloy, titanium silicon master alloy, Al beans and TiO 2 Dosing according to the ratio of Ti-5.8Al-3.6V-0.05Si-0.08O;

[0036] Step 2: Fully mix the above raw materials evenly. After the mixing is completed, use an 8,000-ton hydraulic press to press it into an electrode block, and the pressing pressure is 65MPa;

[0037] Step 3: vacuum plasma welding the electrode block obtained in step 2 to obtain a consumable electrode;

[0038] Step 4: Melting the consumable electrode obtained in step 3 in a vacuum tertiary electric arc furnace, specifically:

[0039] The crucible with a diameter of 560mm was used for the first melting. During the melting process, the vacuum degree was controlled below 5.0Pa, the melting current was 15-25kA, the melting voltage was 30-35V, the arc-stabilizing current was 12A, the arc-stabilizing cycle was DC, and the cooling time after melting was constant. Less than 5....

Embodiment 2

[0049] Step 1: Combine the national standard sponge titanium, aluminum vanadium master alloy, titanium silicon master alloy, Al beans and TiO 2 Dosing according to the ratio of Ti-6.0Al-4.0V-0.06Si-0.10O;

[0050] Step 2: Fully mix the above raw materials evenly. After the mixing is completed, use an 8,000-ton hydraulic press to press it into an electrode block, and the pressing pressure is 70MPa;

[0051] Step 3: vacuum plasma welding the electrode block obtained in step 2 to obtain a consumable electrode;

[0052] Step 4: Melting the consumable electrode obtained in step 3 in a vacuum tertiary electric arc furnace, specifically:

[0053] The crucible with a diameter of 640mm was used for the first smelting process. During the smelting process, the vacuum degree was controlled below 5.0Pa, the smelting current was 15-25kA, the smelting voltage was 30-35V, the arc-stabilizing current was 15A, the arc-stabilizing cycle was DC, and the cooling time after smelting was constant. ...

Embodiment 3

[0063] Step 1: Combine the national standard sponge titanium, aluminum vanadium master alloy, titanium silicon master alloy, Al beans and TiO 2 Dosing according to the ratio of Ti-6.36Al-4.40V-0.07Si-0.11O;

[0064] Step 2: Fully mix the above raw materials evenly. After the mixing is completed, use an 8,000-ton hydraulic press to press it into an electrode block, and the pressing pressure is 72MPa;

[0065] Step 3: vacuum plasma welding the electrode block obtained in step 2 to obtain a consumable electrode;

[0066] Step 4: Melting the consumable electrode obtained in step 3 in a vacuum tertiary electric arc furnace, specifically:

[0067] The crucible with a diameter of 680mm was used for the first melting. During the melting process, the vacuum degree was controlled below 5.0Pa, the melting current was 15-25kA, the melting voltage was 30-35V, the arc-stabilizing current was 18A, the arc-stabilizing cycle was DC, and the cooling time after melting was constant. Less than ...

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Abstract

The invention discloses a method for controlling a solidification structure of a large-size TC4-DT titanium alloy ingot. The method particularly comprises the steps that batching is conducted on sponge titanium and intermediate alloy according to the proportion required by the GB / T3620.1, the materials are pressed into an electrode block after being mixed, the electrode block is subjected to vacuum plasma welding and then subjected to vacuum arc furnace smelting, the arc stabilizing current and the arc stabilizing period are strictly controlled when third-time smelting is conducted in the smelting process, and lastly the finished ingot product is obtained after surface machining is conducted. According to the method, VAR three-time smelting is conducted, the solidification structure of the TC4-DT titanium alloy ingot is uniformized by adopting an appropriate arc stabilizing parameter technology when third-time smelting is conducted, and therefore the problem that grain crushing is difficult in the forging process due to the fact that the solidification structure of an existing large-size (ranging from phi 720 mm to phi 1,000 mm) TC4-DT titanium alloy ingot is thick and big is solved.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy processing, and in particular relates to a method for controlling the solidification structure of a large-scale TC4-DT titanium alloy ingot. Background technique [0002] TC4-DT damage tolerant titanium alloy is a titanium alloy with low content of interstitial elements developed on the basis of Ti-6Al-4V. Good weldability and long service life have been widely used in new aircraft. With the integration and large-scale development of aerospace titanium alloy structural parts, die forgings require rods with a diameter of more than 600mm, and the increase in the diameter of the rods requires larger-sized ingots. The increase in the ingot size makes its composition uniform And the solidification structure is affected. The diameter of the finished product of conventional TC4-DT titanium alloy ingot is generally not more than 720mm, and the yield of ingot is not high, which cannot meet the mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/03
CPCC22C1/03C22C14/00
Inventor 赵小花王文盛罗文忠赖运金王凯旋刘向宏
Owner 西部超导材料科技股份有限公司
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