A kind of nearly beta type high-strength high-toughness titanium alloy and its preparation method

Abstract

A near-beta high-strength and high-toughness titanium alloy relates to a near-beta titanium alloy, which is suitable for aerospace armor-piercing projectile body materials. The weight percent composition of its alloy is: Al: 3.0%-7%, Zr: 1%-4%, Mo: 2%-6%, Fe: 0.5%-2.5%, Cr: 0.5%-4%, Sn: 1%-6%, the balance is Ti and unavoidable impurity elements. The alloy is blank-forged at a temperature of 1050°C-1150°C, and the heat deformation is 60%-75%. The forging temperature of the finished forging is controlled at a temperature of 930°C-980°C, and the final forging temperature is 800°C-850°C. Alloy finished products are used after air-cooling treatment. Under the optimal heat treatment system, the alloy can obtain comprehensive performance matching such as excellent strength, plasticity, impact toughness and hardness.

Description

A near-beta high-strength high-toughness titanium alloy and its preparation method technical field A kind of near β type high strength high toughness titanium alloy and preparation method thereof, relate to a kind of near β titanium alloy, this alloy is suitable for It is used as the body material of aerospace armor-piercing projectiles and is used in other fields as forgings, bars, plates and wires. Background technique [0002] Under normal circumstances, increasing the strength of titanium alloy will increase the hardness, but it will also bring about the loss of plasticity and impact toughness. Analyzing the matching relationship between the strength and hardness of titanium alloys, it is found that to meet HRC ≥ 40, the strength is generally greater than 1230MPa. Titanium In terms of performance matching of alloys, nearly α titanium alloys and α+β titanium alloys have good plasticity and impact toughness, which can meet δ≥10%, ak≥30J / cm2 requirements. However, t...

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Problems solved by technology

However, the plasticity of this alloy is low in the high-strength state, and the strengthening ability of the alloy is limited, and the hardness cannot meet the requirements for use;