A method for preparing large-scale ti‑1023 alloy ingots

A ti-1023, alloy ingot technology, applied in the field of titanium alloy processing, can solve the problems of intensified segregation of Ti-1023 alloy, increase in ingot size, etc., achieve uniform ingot composition, reduce segregation, and inhibit Fe enrichment Effect

Active Publication Date: 2017-12-22
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

However, with the continuous increase of the amount of titanium used in large-scale aircraft engineering, the size and weight of titanium alloy forgings for aircraft are increasing day by day, and the specifications of ingots are also increasing accordingly. The segregation of Ti-1023 alloy is intensified. Large-scale Ti-1023 alloy ingot
Therefore, for the preparation of Ti1023 alloy ingots with uniform composition, it has become a technical bottleneck in the field of materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1, pressing the electrode block

[0035] According to the proportion of the alloy is Ti-10V-2Fe-3Al (Wt%), select 0-grade sponge titanium, VAlFe and AlV master alloys for electrode block pressing, and pick materials for sponge titanium and master alloys before pressing to ensure the quality of raw materials. After the selected raw materials are mixed evenly, they are pressed into an electrode block with a size of 332×300×150mm on a hydraulic press.

[0036] Step 2, welding electrodes

[0037] Combine the pressed electrode blocks into an electrode of Φ360×4200mm, and then weld it in an argon-protected plasma welding box to form a consumable electrode for smelting.

[0038] Step 3, primary current controlled smelting of Φ440mm ingot

[0039] A Φ440mm crucible is used for one smelting process, the air leakage rate is controlled below 0.12Pa / min during the smelting process, the smelting current is 8-12kA, the arc stabilization current is 3-10A DC, the smelting voltag...

Embodiment 2

[0047] Step 1, electrode block pressing

[0048] According to the proportion of the alloy is Ti-10V-2Fe-3Al (Wt%), select 0-grade sponge titanium, VAlFe and AlV master alloys for electrode block pressing, and pick materials for sponge titanium and master alloys before pressing to ensure the quality of raw materials. Mix the selected raw materials evenly and press them into electrode blocks on a hydraulic press.

[0049] Step 2, welding electrodes

[0050]Combine the pressed electrode blocks into electrodes, and then weld them in an argon-protected plasma welding box to form consumable electrodes for melting.

[0051] Step 3, primary current controlled smelting of Φ360mm ingot

[0052] A Φ360mm crucible is used for one smelting process, the air leakage rate is controlled below 0.12Pa / min during the smelting process, the smelting current is 6-10kA, the arc-stabilizing current is 2-8A DC, the smelting voltage is 32-36V, and the cooling time after smelting is 2.5 Hours, after t...

Embodiment 3

[0058] Step 1, pressing the electrode block

[0059] According to the proportion of the alloy is Ti-10V-2Fe-3Al (Wt%), select 0-grade sponge titanium, VAlFe and AlV master alloys for electrode block pressing, and pick materials for sponge titanium and master alloys before pressing to ensure the quality of raw materials. Mix the selected raw materials evenly and press them into electrode blocks on a hydraulic press.

[0060] Step 2, welding electrodes

[0061] Combine the pressed electrode blocks into electrodes, and then weld them in an argon-protected plasma welding box to form consumable electrodes for melting.

[0062] Step 3, primary current controlled smelting of Φ280mm ingot

[0063] A Φ280mm crucible is used for one smelting process, the air leakage rate is controlled below 0.12Pa / min during the smelting process, the smelting current is 4~8kA, the arc stabilization current is 1~6A DC, the smelting voltage is 28~32V, and the cooling time is 2 hours after smelting , af...

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PUM

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Abstract

The invention discloses a method for preparing a large-sized Ti-1023 (Ti-10V-2Fe-3Al) alloy cast ingot. The method for preparing the large-sized Ti-1023 alloy cast ingot comprises the following steps of selecting and mixing a grade-0 titanium sponge, VAlFe and an AlV intermediate alloy, and pressing an obtained first mixture to form an electrode block; welding the electrode block to form a consumable electrode, and afterwards, smelting the electrode through the ways of two-time electric current controlled smelting and one-time molten drop controlled smelting in sequence, so as to prepare and obtain the large-sized Ti-1023 alloy cast ingot. An arc melting molten drop control technique is adopted for the method for preparing the large-sized Ti-1023 alloy cast ingot; and the segregation of an element Fe is reduced. Through controlling the quantity of molten drops, the large-sized Ti-1023 alloy cast ingot is prepared; indicated through analysis and detection, the cast ingot prepared by the process is quite uniform in components; the enrichment of Fe in the alloy can be effectively restrained; indicated by the detection on a microstructure and a macrostructure of a bar which is forged by adopting the large-sized Ti-1023 alloy cast ingot and of which the specification is [phi]550mm, no [beta] spots exist in a Ti-1023 alloy bar; and further, the flaw detection and the performance of the alloy bar both meet requirements of aerospace technical standards.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy processing, and in particular relates to a method for preparing large-scale Ti-1023 alloy ingots. Background technique [0002] Ti-10V-2Fe-3Al (Ti-1023) is widely used in the production of large-scale key load-bearing components such as aircraft landing gear due to its excellent properties such as high strength, high fracture toughness, and high hardenability. However, in the process of producing Ti-1023 alloy ingots by vacuum consumable arc melting technology, due to the high content of iron added with β-stabilizing elements, it is easy to form iron segregation during smelting. A region containing no or little alpha phase is formed, the so-called beta spot. This β spot seriously reduces the plasticity and low cycle fatigue performance of titanium components. At present, scholars agree that the most effective way to reduce β spots is to improve the composition uniformity of Fe in Ti-1023 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/03C22B9/20
CPCC22B9/20C22C1/03C22C14/00
Inventor 何永胜罗文忠王涛王凯旋何涛刘向宏
Owner 西部超导材料科技股份有限公司
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