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Forging method using flat-die hammer to improve structure property of TC21 titanium alloy

A TC21, microstructure and performance technology, applied in the field of material processing, can solve the problems of increasing grain size, affecting the plastic index of forgings, etc., and achieve the effect of improving the reliability of the structure

Inactive Publication Date: 2017-04-26
SHAANXI HONGYUAN AVIATION FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after forging is completed after quasi-β forging heating, the grain size will increase further, which may affect the shaping index of the final forging

Method used

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  • Forging method using flat-die hammer to improve structure property of TC21 titanium alloy
  • Forging method using flat-die hammer to improve structure property of TC21 titanium alloy
  • Forging method using flat-die hammer to improve structure property of TC21 titanium alloy

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Effect test

Embodiment 1

[0022] 1.1 Raw materials

[0023] (1) The chemical composition of raw materials is re-inspected according to the standard GB / T3620.2, and the result is qualified;

[0024] (2) The mechanical properties of raw materials are re-inspected according to the standard CBQB903-001, and the result is qualified, as shown in Table 1;

[0025] (3) Low-magnification structure of raw materials: no clear crystals, no metallurgical defects, standard: GB / T5168.

[0026] Table 1 Mechanical Properties of Raw Materials

[0027]

[0028] (4) High-magnification structure of raw materials: uniform equiaxed α structure, standard: GB / T5168;

[0029] (5) Raw material flaw detection: According to Φ2.0 flat bottom hole, the result is qualified, standard: Class A in CBQB903-001;

[0030] (6) Raw material KIC: standard data: ≥70, actual measurement: 72.9~75.6, the result is qualified, standard: . CBQB903-001

[0031] 1.2 Forging, heat treatment, machining and inspection

[0032] (1) Because the mi...

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Abstract

The invention relates to a forging method using a flat-die hammer to improve the structure property of a TC21 titanium alloy. The forging method comprises the following steps: 1) substituting forging is carried out at a phase transformation point of a titanium alloy blank, and the substituting forging temperature of the blank is T beta25-45 degrees, and a heating coefficient is 0.4-1.0min / mm; 2) flaw inspection of the blank is carried out; 3) quisi-beta forging moulding is carried out at the phase transformation point; (4) heat treatment is carried out, the blank is subjected to double annealing; and 5) low-magnification inspection, flaw detection, sampling high-magnification inspection and mechanical property inspection are carried out by 100%. With the adoption the forging method, the TC21 titanium alloy having high structure property can be obtained, the strength, the plasticity and the breaking tenacity of the TC21 titanium alloy can reach the prospective requirements, and the structure reliability of a TC21 titanium alloy component is improved.

Description

technical field [0001] The invention relates to a forging method for improving the structure and performance of TC21 titanium alloy. The processed titanium alloy is a novel titanium alloy material with high strength, high toughness, high damage tolerance and good fatigue performance, belonging to the field of material processing. Background technique [0002] TC21 is a new type of titanium alloy material, its nominal composition is Ti-6Al--3Mo-2Nb-2Sn-2Zr-1Cr, and its Tβ transformation temperature range is 965°C to 945°C. The alloy has the advantages of high strength, high toughness, high damage tolerance and good fatigue performance, so it is widely used in the wing joint structure of the aircraft, the fuselage and the landing gear connection frame; at the same time, the alloy can also be used to manufacture Parts that work for a long time at 400°C to 500°C. [0003] TC21 is usually used in the double annealed state, and can also be used in the quenched state. The control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 姚彦军郝宏斌李明
Owner SHAANXI HONGYUAN AVIATION FORGING
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