Ti6242 titanium alloy and preparation method of small-size bar thereof

A titanium alloy, small-scale technology, applied in the field of non-ferrous metal processing, can solve the problems of poor uniformity of the bar structure, achieve the effect of good flaw detection, high uniformity of the structure, and overcome the technical bottleneck

Active Publication Date: 2015-04-22
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Another object of the present invention is to provide a method for preparing Ti6242 titanium...

Method used

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  • Ti6242 titanium alloy and preparation method of small-size bar thereof
  • Ti6242 titanium alloy and preparation method of small-size bar thereof
  • Ti6242 titanium alloy and preparation method of small-size bar thereof

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preparation example Construction

[0031] The preparation method of the above-mentioned Ti6242 titanium alloy small-size bar material specifically comprises the following steps:

[0032] Step 1: Blank Forging

[0033] The Ti6242 titanium alloy ingot is heated at 150°C-200°C above the phase transition point, the holding time is 240-480min, the forging ratio is controlled between 1.2-1.6 during forging, and the billet with the as-cast structure is initially broken; the Ti6242 titanium alloy ingot It is a 3-5 ton Ti6242 titanium alloy ingot produced by a vacuum consumable electric arc furnace. It is composed of the following components according to the mass percentage: Al 5.50%-6.50%, Sn 1.80%-2.20%, Zr 3.60%-4.40% , Mo 1.80%~2.20%, Si 0.06%~0.1%, Fe≤0.10%, O≤0.15%, C≤0.05%, N≤0.05%, the rest are titanium and unavoidable impurity elements;

[0034] Step 2: Intermediate billet forging

[0035] 7-fire forging the pre-broken as-cast structure blank obtained after billet forging in step 1, heating at 40°C below the ...

Embodiment 1

[0042] Open billet forging: Heating 3 tons of Ti6242 titanium alloy ingot at 1190°C, holding it for 240 minutes, performing one upsetting and one drawing, the forging ratio is controlled at about 1.4, and the final forging temperature is controlled above 950°C to avoid surface and core The temperature difference is large, resulting in uneven structure, and a billet with a preliminary broken structure in the as-cast state is obtained; among them, the Ti6242 titanium alloy ingot is composed of the following components according to the mass percentage: Al 5.50%, Sn 2.20%, Zr 4.0%, Mo 2.20%, Si 0.08%, Fe≤0.10%, O≤0.15%, C≤0.05%, N≤0.05%, the rest is titanium and unavoidable impurity elements;

[0043] Intermediate billet forging: 7-fire forging is carried out on the billet obtained with the preliminary broken cast structure. The heating temperature of 1 fire is 1100 ℃, after 3.5 hours of heat preservation, carry out two upsetting and two drawing; Upsetting and two pulls; 4 heatin...

Embodiment 2

[0052] Blank forging: Heating the 4-ton Ti6242 titanium alloy ingot at 1170°C, holding it for 360 minutes, then performing one upsetting and one pulling, and the forging ratio is controlled at about 1.2. The final forging temperature is controlled above 950°C to avoid the large temperature difference between the surface and the core, resulting in uneven structure, and to obtain a billet with a preliminary broken structure in the as-cast state; among them, the Ti6242 titanium alloy ingot is composed of the following components according to the mass percentage: Al 6.50%, Sn 2.0%, Zr 3.60%, Mo 2.0%, Si 0.1%, Fe≤0.10%, O≤0.15%, C≤0.05%, N≤0.05%, the rest is titanium and unavoidable impurity elements;

[0053] Intermediate billet forging: 7-fire forging is carried out on the billet obtained with the preliminary broken cast structure. The heating temperature of the 1 fire is 1100 ℃, and two upsetting and two pulling are performed after the heat preservation for 7 hours; Upsetting a...

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Abstract

The invention discloses a Ti6242 titanium alloy consisting of the following components in percentage by mass: 5.5-6.5% of Al, 1.8-2.2% of Sn, 3.6-4.4% of Zr, 1.8-2.2% of Mo, 0.06-0.1% of Si, less than or equal to 0.1% of Fe, less than or equal to 0.15% of O, less than or equal to 0.05% of C, less than or equal to 0.05% of N, and the balance of titanium and inevitable impurity elements. A preparation method of a small-size bar of the Ti6242 titanium alloy comprises the following steps: performing billet forging to obtain a blank with a preliminarily broken as-cast state structure; then performing 7 fire forging to obtain a blank structure with fully broken and uniformly refined crystalline grains; then performing 2-3 fire forging to obtain a black skin bar; and finally, performing heat treatment to obtain a finished product bar. By adopting the Ti6242 titanium alloy and the preparation method disclosed by the invention, the problem that the structural uniformity of the edges and center of the bar is poor is solved, a small-size (phi 20-100mm) Ti6242 titanium alloy bar for vanes of aircraft engines is obtained, and the structure is highly homogenized and is good in flaw detection.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal processing. The invention relates to a Ti6242 titanium alloy, and also relates to a preparation method of a small-sized Ti6242 titanium alloy rod. Background technique [0002] The nominal composition of Ti6242 titanium alloy is Ti-6Al-2Sn-4Zr-2Mo-0.1Si. This alloy is a near-alpha-type high-temperature titanium alloy with high creep resistance. high pressure compressor discs and blades. [0003] In foreign countries, this alloy has been successfully applied to advanced aero-engines such as F414, F119 and TRENT800. It can be said that in the range of 470°C to 550°C, the alloy is widely used and is a very mature high-temperature titanium alloy for aero-engines. [0004] In China, with the development of advanced aircraft, especially large commercial aircraft, the requirements for the thrust-to-weight ratio of aero-engines are constantly increasing, which makes the metallurgical defects, ...

Claims

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Application Information

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IPC IPC(8): C22C14/00B21C37/04C22F1/18
Inventor 雷锦文李少强孙小平张奕赖运金尚金金王晓亮
Owner 西部超导材料科技股份有限公司
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