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A Forging Method for Improving the Microstructure and Properties of tc18 Titanium Alloy

A technology of microstructure and performance, TC18, applied in the field of material processing, can solve the problem of less research on TC18 quasi-β forging, and achieve the effect of improving the reliability of the structure

Active Publication Date: 2017-07-28
SHAANXI HONGYUAN AVIATION FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some data discuss the effect of conventional forging temperature on the microstructure and properties of TC18 titanium alloy, but there are few studies on TC18 quasi-β forging

Method used

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  • A Forging Method for Improving the Microstructure and Properties of tc18 Titanium Alloy
  • A Forging Method for Improving the Microstructure and Properties of tc18 Titanium Alloy

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Experimental program
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Embodiment 1

[0020] 1.1 Raw materials

[0021] (1) The chemical composition of raw materials is re-inspected according to the standard GB / T4698, and the result is qualified;

[0022] (2) The mechanical properties of raw materials were re-inspected according to the standard YMS1507, and the result was qualified, as shown in Table 1;

[0023] (3) Low-magnification structure of raw materials: no clear crystals, no metallurgical defects, standard: GB / T5168.

[0024] Table 1 Mechanical properties of raw materials

[0025]

[0026] (4) High-magnification structure of raw materials: uniform equiaxed α structure, standard: GB / T5168;

[0027] (5) Raw material flaw detection: According to Φ2.0 flat-bottomed hole, the result is qualified, standard: Class A in YMS1507;

[0028] (6) Raw material KIC: standard data: ≥55, actual measurement: 59.5-58.6, the result is qualified, standard: YMS1507.

[0029] 1.2 Forging, heat treatment, machining and inspection

[0030] (1) Because the microstructure...

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Abstract

The invention relates to a forging method for improving the TC18 titanium alloy structure property, and belongs to the field of material processing. A microscopic structure of a TC18 titanium alloy is sensitive in temperature influence, during two-phase-zone forging, the microscopic structure is composed of conversion structures of a primary alpha phase and a beta phase, along with rising of the forging temperature, the content of the primary alpha phase is decreased, the size is increased, and the equiaxial degree is increased. During quasi beta forging above a phase change point, if the heat preservation time and the deformation amount are appropriately controlled, an even basket-weave microstructure can be obtained, even though the room-temperature plasticity of the structure is worse than an equiaxial structure, the strength is high, and the high-temperature behavior, the breaking tenacity and the fatigue property are better than those of the equiaxial structure; but above the phase point, a Widmannstatten structure can be obtained if the heat preservation time is too long; and compared with the equiaxial structure, the room temperature strength and high temperature strength of the Widmannstatten structure are improved, the stretching plasticity is reduced, and the room temperature impact is reduced. By means of the forging method, the structure reliability of a TC18 titanium alloy component is improved while the high strength, the high plasticity and the high breaking tenacity are obtained.

Description

technical field [0001] The invention relates to a forging method for improving the structure and performance of TC18 titanium alloy. The processed titanium alloy has a basket-like structure with high strength, high toughness, high plasticity and good hardenability, and belongs to the field of material processing. Background technique [0002] TC18 is a high-alloyed titanium alloy, its nominal composition is Ti-5Al-5Mo-5V-1Fe, and its Tβ transformation temperature range is 870°C to 880°C. The alloy has the advantages of high strength, high plasticity, good hardenability, and good weldability, so it is widely used in large load-bearing structural parts of aircraft fuselage and landing gear. At the same time, the alloy can also be used to manufacture 350 ° C Parts that work for a long time at ~400°C. TC18 is usually used in the annealed state and can also be used in the quenched state. The control of the heating and deformation process of forging is a difficult point in the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18B21J5/06B21J5/08
CPCB21J5/06B21J5/08C22F1/183
Inventor 姚彦军郝宏斌薛强李增乐李明何力
Owner SHAANXI HONGYUAN AVIATION FORGING
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