Preparation method of Ti3Al alloy bolt

A bolt and alloy technology, applied in the field of preparation of Ti3Al alloy bolts, can solve the problems of high difficulty in plastic processing, brittle materials with low plasticity, and low economic benefits

Active Publication Date: 2019-03-22
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ti 3 Al alloy phase transformation is complex, the material is usually brittle and plasticity is low, and plastic processing is difficult, while machining threads and bolt heads consumes a lot of raw materials and low economic benefits

Method used

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Embodiment Construction

[0018] The technical solution of the present invention will be further described below in conjunction with the embodiments.

[0019] The kind of Ti 3 Ti used in the preparation method of Al alloy bolts 3 The chemical composition and weight percentage of the Al alloy are:

[0020] Al: 10.5% ~ 13.5%, Nb: 26.0% ~ 31.0%, Mo: 1.5% ~ 4.0%, the balance is Ti and unavoidable impurity elements; the unavoidable impurity elements are Fe, Si, C, O, N, H, Fe≤0.3%, Si≤0.15%, C≤0.15%, O≤0.15%, N≤0.05%, H≤0.0125%; the steps of the method are as follows:

[0021] Step 1. Rod material forming: the ingot is forged on a fast forging machine, and drawn into a round bar with a diameter of 60mm. The forging temperature is 1000°C to 1100°C, and the deformation per fire exceeds 30%. Then the round bar is passed through a rolling mill. Hot-rolled into rods or wires with the diameter required for bolt rod material, the hot rolling temperature is 1000℃~1100℃, and then cut into the required length of b...

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Abstract

The invention relates to a preparation method of a Ti3Al alloy bolt. The method comprises the following steps of bar forming, solution treatment, machining, heading, thread machining and vacuum aging.Compared with the prior art, the bolt is simple in preparation process and excellent in performance, especially has the stretching and shear strength significantly higher than that of common titaniumalloy bolts at the high temperature of 600-700 DEG C, and has the density being about 4.9g / cm3 significantly lower than that of high temperature alloy used at the same temperature at present.

Description

technical field [0001] The present invention is a Ti 3 The invention discloses a method for preparing Al alloy bolts, belonging to the technical field of fasteners. Background technique [0002] As fastener and connector, bolt is an indispensable part in industrial production, known as the rice of industry. With the further development of the aerospace industry, the environment in which bolts are used is getting worse and worse. They not only have to bear the huge load when the spacecraft accelerates, but also work at a relatively high temperature. If bolts made of ordinary materials are used, their high-temperature mechanical properties are difficult to meet the design requirements, and the use of high-temperature alloys such as Ni-based and Fe-based will increase the self-weight of the spacecraft, thereby reducing its carrying capacity. Titanium alloys are widely used in the aerospace industry due to their excellent specific strength and corrosion resistance, but the wor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/02C22F1/18B23P15/00C21D9/00
CPCB23P15/00C21D9/0093C22C14/00C22F1/02C22F1/183
Inventor 谭启明曹京霞周毅张明达隋楠
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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