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Medium-strength corrosion-resistant weldable crack-arrest titanium alloy and preparation method thereof

A titanium alloy and corrosion-resistant technology, applied in the field of medium-strength, corrosion-resistant, weldable and crack-preventing titanium alloys and their preparation, can solve the problems of difficulty in meeting the special use requirements of ships and marine engineering equipment, low alloy toughness reserves, etc., and achieve good technical Application and market prospect, effect of good crack arrest performance, good welding performance

Inactive Publication Date: 2017-08-18
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

At present, the representative medium-strength titanium alloys at home and abroad mainly include TA5, Ti70, Ti75, Gr18, PT-5V, ΠT-3B, etc. These alloys have relatively low toughness reserves, K IC The value is generally 100 MPa m 1 / 2 Left and right, DT can be about 600J, and cracks are easy to expand quickly after initiation, which is difficult to meet the special requirements of ships and marine engineering equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The preparation method of the medium-strength corrosion-resistant weldable crack-stopping titanium alloy comprises the following steps:

[0019] Step 1. Alloy composition batching: V, Nb, Mo, Ti, Ni elements are added in the form of master alloys, Zr, Sn, Al elements are added in the form of pure metals, the ingredients are weighed according to the above formula, and after mixing thoroughly, press into electrodes ;

[0020] Step 2. Ingot smelting: use vacuum consumable arc melting technology to cast ingots, the vacuum degree of pre-melting is 1Pa, the number of smelting times is ≥ 3 times, and then the ingots are rolled and necked;

[0021] Step 3. Billet forging or casting: After the ingot is heated, it is billeted on an air hammer or press, and processed to obtain a titanium alloy plate or titanium alloy forging.

Embodiment 1

[0022] Example 1: Ti-3Al-1Mo-0.5Ni-0.5Sn-0.1Si alloy

[0023] A medium-strength, corrosion-resistant, weldable and crack-stopping titanium alloy is composed of the following components in terms of mass percentage: 3% by mass of Al, 1% by mass of Mo, 0.5% by mass of Ni, and 0.5% by mass of Sn The mass percentage of Si is 0.5% and Si is 0.1%, and the balance is Ti and unavoidable impurities.

[0024] Weigh raw materials according to the composition listed in Example 1, the aluminum element of 3wt.%, the Mo element of 1wt.%, the nickel element of 0.5wt.%, the tin element of 0.5wt.%, the silicon element of 0.1wt.% and Industrial grade 1 sponge titanium is 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. After being treated by a suitable heat treatment system, the properties of the alloy material are shown in Table 1.

Embodiment 2

[0025] Example 2: Ti-4.5Al-3V-1Nb-0.5Ni-2Zr-0.05Si alloy

[0026] A medium-strength, corrosion-resistant, weldable and crack-stopping titanium alloy is composed of the following components in terms of mass percentage: the mass percentage of Al is 4.5%, the mass percentage of V is 3%, the mass percentage of Nb is 1%, and the mass percentage of Ni The mass percent of Zr is 0.5%, the mass percent of Zr is 2%, the mass percent of Si is 0.05%, and the balance is Ti and unavoidable impurities.

[0027] Weigh the raw materials according to the ingredients listed in Example 2, 4.5wt.% aluminum element, 3wt.% vanadium element, 1wt.% niobium element, 0.5wt.% nickel element, 2wt.% zirconium element, 0.05 The wt.% silicon element and industrial grade 1 sponge titanium are melted 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. After being treated by...

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Abstract

The invention discloses a medium-strength corrosion-resistant weldable crack-arrest titanium alloy. The titanium alloy is composed of, by mass percentage, 3.0-7.0% of an alpha stabilizing element Al, 1.5-4.5% of beta stabilizing elements of Mo, V, Nb and Ni, 0.5-3.0% of neutral elements of Zr and Sn, 0.01-0.3% of a Si element and the balance Ti and inevitable impurities, wherein, by mass percentage, 0-1% of Mo, 0-3% of V, 0-1% of Nb, 0.5% of Ni, 0-2% of Zr and 0-3% of Sn are included. The titanium alloy has the good strength, plasticity and toughness matching, the yield strength Rp0.2 is larger than or equal to 640 MPa, the tensile strength Rm is larger than or equal to 740 MPa, the elongation A is larger than or equal to 15%, the fracture toughness KIC is larger than or equal to 140 MPa.m<1 / 2>, and the impact toughness KV2 is larger than or equal to 80J; the alloy has the good crack arrest performance, and the dynamic tearing energy DTE is larger than or equal to 800 J; and meanwhile the good welding performance and resistance to seawater corrosion are achieved, the welding coefficient is larger than or equal to 0.95, the KISCC is larger than or equal to 95 MPa.m<1 / 2>, and the medium-strength corrosion-resistant weldable crack-arrest titanium alloy has the good technical application and market prospects in the fields of ship and marine engineering.

Description

technical field [0001] The invention relates to the field of titanium alloys for ships and marine engineering, in particular to a medium-strength corrosion-resistant weldable crack-stopping titanium alloy and a preparation method thereof. Background technique [0002] Titanium and titanium alloys have excellent properties such as high specific strength, good corrosion resistance, and non-magnetic properties. They are especially immune to erosion by salt water or sea water and marine atmospheric environments. They are high-quality light structural materials and are called "marine metals". With the continuous development of my country's ships and marine equipment, titanium alloys are gradually used in load-bearing structural parts, such as oil well pipes for deep-sea oil and gas development, deep submersible pressure shells and pressure vessels. Based on the consideration of service safety and reliability, titanium alloy structural parts put forward higher requirements on the ...

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 赵文光李士凯张斌斌
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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