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Corrosion-resistance weldable titanium alloy with high strength and high impact toughness and preparation method thereof

A titanium alloy, high-impact technology, applied in the field of titanium alloys, can solve the problems of low impact toughness and poor performance, and achieve the effects of good strength and plastic toughness, good cold and hot processing performance, good welding performance and seawater corrosion resistance.

Active Publication Date: 2016-11-23
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main representative high-strength titanium alloys at home and abroad include Ti62222S, BT22, Ti1023, TC21 and β21S, etc. These alloys have high strength, good plasticity and fracture toughness, but low impact toughness, which cannot meet the special operating conditions of the marine environment, such as The important reason for some ships to suffer marine accidents is due to the brittleness of materials.
In addition, large titanium alloy structural parts for ships and ocean engineering need to be welded. The existing high-strength titanium alloys have poor welding performance, especially the impact toughness of the heat-affected zone after welding.

Method used

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  • Corrosion-resistance weldable titanium alloy with high strength and high impact toughness and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Ti-6.5Al-3Mo -2V -2Zr-2Nb -1.5Cr alloy

[0021] Weigh the raw materials according to the ingredients listed in Example 1, 6.5wt.% of the aluminum element, 2wt.% of the zirconium element, 1.5wt.% of the chromium element, 3wt.% of the molybdenum element, 2wt.% of the niobium element, 2wt.% .% vanadium element and industrial grade 1 sponge titanium are smelted into alloy ingots three times through mixing materials, pressing electrode rods, and vacuum consumable electric arc furnace. via T β +150°C blanking, α+β phase zone forging into forgings, rolling into wide sheets with different thicknesses by hot and cold rolling mills. After being treated by a suitable heat treatment system, the properties of the alloy material are shown in Table 1.

Embodiment 2

[0022] Example 2: Ti-6.5Al-3Mo -2V -2Zr-2Nb -0.3Cr alloy

[0023] Weigh the raw materials according to the ingredients listed in Example 2, with 6.5wt.% aluminum element, 2wt.% zirconium element, 0.3wt.% chromium element, 3wt.% molybdenum element, 2wt.% niobium element, 2wt.% .% vanadium element and industrial grade 1 sponge titanium are smelted into alloy ingots three times through mixing materials, pressing electrode rods, and vacuum consumable electric arc furnace. via T β +150°C blanking, α+β phase zone forging into forgings, rolling into wide sheets with different thicknesses by hot and cold rolling mills. After being treated by a suitable heat treatment system, the properties of the alloy material are shown in Table 1.

Embodiment 3

[0024] Example 3: Ti-6.5Al-0.3Mo -2V -2Zr-2Nb -1.5Cr alloy

[0025] Weigh the raw materials according to the ingredients listed in Example 3, 6.5wt.% of the aluminum element, 2wt.% of the zirconium element, 1.5wt.% of the chromium element, 0.3wt.% of the molybdenum element, 2wt.% of the niobium element, 2wt.% vanadium element and industrial grade 1 sponge titanium were smelted into alloy ingots three times through mixing, pressing electrode rods, and vacuum consumable electric arc furnace. via T β +150°C blanking, α+β phase zone forging into forgings, rolling into wide sheets with different thicknesses by hot and cold rolling mills. After being treated by a suitable heat treatment system, the properties of the alloy material are shown in Table 1.

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Abstract

The invention discloses a corrosion-resistance weldable titanium alloy with high strength and high impact toughness, and relates to the technical field of titanium alloys. The corrosion-resistance weldable titanium alloy comprises the following components in percentage by mass: 4.0-8.0 wt.% of Al, 0.3-6.0 wt.% of Mo, 0.3-6.0 wt.% of V, 0.3-5.0 wt.% of Nb, 0.3-6.0 wt.% of Cr, 0.3-5.0 wt.% of Zr, aluminum equivalent [Al] not less than 6, molybdenum equivalent [Mo] not more than 8.0, and the balance of Ti, interstitial elements and inevitable impurity elements; the interstitial elements are C, H, O and N; and the mass percentage sum of all the elements in the titanium alloy is 100%. The titanium alloy material has comprehensive performances of high strength, high impact toughness, corrosion resistance and weldability, is excellent in cold and hot processing performance, and can be molded as forgings, thick plates and the like.

Description

technical field [0001] The invention relates to a titanium alloy used in ships and marine engineering, in particular to a novel high-strength and high-impact-toughness corrosion-resistant weldable titanium alloy and a preparation method thereof. Background technique [0002] Titanium and titanium alloys have excellent properties such as high specific strength, corrosion resistance, and non-magnetic properties, especially in seawater and acidic hydrocarbon compounds, and are preferred materials for ships and ocean engineering, especially in saline environments. Therefore, titanium alloy is known as "ocean metal". [0003] With the development of my country's marine industry and navy, the continuous updating of marine engineering components and ship equipment has put forward higher requirements for the strength, plasticity and toughness of titanium alloy materials, such as oil well pipes, deep submersibles, etc. Compression parts require titanium alloys to have high strength a...

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 李士凯杨治军张斌斌王洋
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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