A kind of high nb content ti-nb alloy ingot billet forging method

An alloy ingot and billet forging technology is applied in the field of titanium alloy forging, which can solve the problems of easy generation of segregation forging deformation resistance, difficulty in forming homogeneous bars, high-density inclusions, etc., so as to improve production efficiency and bar yield. , Increase the high temperature plasticity, the effect of small fluctuation

Active Publication Date: 2022-04-19
东莞市诺德金属科技有限公司
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Problems solved by technology

At present, the most widely used titanium alloy wire is Ti-45Nb, but Nb alloy is a high-melting point material, which is prone to high-density inclusions, segregation, and high forging deformation resistance during the smelting process, making it difficult to form homogeneous bar

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  • A kind of high nb content ti-nb alloy ingot billet forging method

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Embodiment 1

[0023] A high Nb content Ti-Nb alloy ingot blank forging method, comprising the following steps:

[0024] Step 1): cutting off the riser and head shrinkage cavity and shrinkage porosity of the Ti-Nb alloy ingot smelted by vacuum self-consumption, machining to remove surface defects, and then performing homogenization heat treatment to form the first annealed ingot;

[0025] Wherein, during the homogenization heat treatment, the heat treatment temperature range is 1200-1300°C, and the holding time range is 24-72h.

[0026] Step 2): Upsetting the first annealed ingot described in step 1), reducing the aspect ratio of the rod, so that the aspect ratio of the first forged billet ranges from 1.5-3 to form the first forged billet.

[0027] Step 3): Forging the first forging blank obtained in step 2) for n times to form a second forging blank;

[0028] The n fire times are 4-6 fire times, and the heating temperature of each fire time is 1200±50°C, 1160±50°C, 1100±50°C and 1050±50°C,...

Embodiment 2

[0035] In this embodiment, the Ti-45Nb alloy ingot smelted by vacuum consumable arc with a size of φ460×2500mm is subjected to billet forging, and the forging equipment is 10000t fast forging machine.

[0036] Step 1): Homogenizing annealing: After polishing the surface of the Ti-45Nb alloy ingot, perform homogenizing annealing at a heating temperature of 1200°C / 48h to form a first annealed ingot.

[0037] Step 2): performing upsetting deformation on the first annealed ingot in step 1), reducing the aspect ratio of the rod, and forming the first forging billet;

[0038] Step 3): The first forging blank obtained in step 2) is forged six times to form a second forging blank. in:

[0039] First fire: heating system 1200℃ / 10h, upsetting φ460×2500mm to the height direction H=2100mm, turning over and continuing upsetting and shaping to φ620×1400mm;

[0040] The second fire: heating system 1200℃ / 12h, upsetting φ620×1400mm to the height direction H=1000mm, turning over to continue u...

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Abstract

A high-Nb content Ti-Nb alloy ingot blanking and forging method is provided, which belongs to the technical field of titanium alloy forging. In the present invention, the high-Nb element Ti-Nb ingot is subjected to two high-temperature homogenization heat treatments during the billeting process to increase the Nb element Diffusion in Ti‑Nb alloys can effectively reduce alloy dendrite segregation; use cooling to open billets to increase alloy high-temperature plasticity; It is beneficial to form a uniform low-magnification structure and improve the bar yield. The method can carry out billet forging for the alloy with the Nb content of Ti-Nb binary alloy not less than 35%, realizes the preparation of Ti-Nb alloy bar with high content of refractory metal Nb, and effectively reduces the production process from ingot to bar The forging times are changed in the middle to improve the production efficiency and the bar yield. The Ti-Nb alloy bar with high Nb element content prepared by this method has uniform alloy composition, small fluctuation, and uniform low-magnification structure.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy forging, in particular to a high Nb content Ti-Nb alloy ingot blank forging method. Background technique [0002] Titanium and titanium alloys have the advantages of excellent specific strength, corrosion resistance and biocompatibility, and are widely used in aviation, aerospace, biomedical and other fields. The fatigue performance and stress concentration sensitivity of titanium alloy fasteners are better than those of the same application. Steel and more than 70% weight reduction as an important material for connecting titanium alloys and other materials. At present, the most widely used titanium alloy wire is Ti-45Nb, but Nb alloy is a high-melting point material, which is prone to high-density inclusions, segregation, and high forging deformation resistance during the smelting process, making it difficult to form homogeneous bar. Therefore it is necessary to propose improvements. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21K29/00C22C14/00C22F1/18
CPCB21J5/002B21K29/00C22C14/00C22F1/183
Inventor 肖维李庆喜
Owner 东莞市诺德金属科技有限公司
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