TiAl alloy with low-temperature superplasticity and component preparation method thereof

A superplastic and alloy technology, applied in the direction of metal rolling, etc., can solve the problems of high mold requirements, harsh deformation process, easy cracking, etc.

Active Publication Date: 2020-06-09
SHANGHAI SPACE PRECISION MACHINERY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical solution problem of the present invention is: to overcome the deficiencies in the prior art, propose a kind of TiAl alloy with low-temperature superplasticity and its component preparation method, the purpose is to solve existing method to prepare components such as TiAl alloy corrugated plate, spherical shape, honeycomb shape There are problems such as easy cracking, harsh deformation process, high mold requirements, etc., to provide a TiAl alloy with low temperature superplasticity and its component preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment is a method for preparing a TiAl alloy with low-temperature superplasticity and its components, which is specifically carried out according to the following steps:

[0026] A. Preparation of TiAl alloy slab: Ti-43Al-2Cr-2Nb-0.3La (at.%) alloy with an average grain size of 20 μm was prepared by pre-alloyed powder + hot isostatic pressing method.

[0027] B. TiAl alloy sheathed rolling: put the above-mentioned TiAl alloy sealed with stainless steel in a furnace with a heating temperature of 1150°C for 40 minutes, adopt a rolling speed of 30±5mm / s, and the deformation of each pass is 22±3% , Each pass is rolled back to the furnace with a heat preservation time of 3-5 minutes.

[0028] C. Heat treatment of the TiAl alloy plate: put the TiAl alloy plate obtained above with a sheath in a furnace with a furnace temperature of 1120° C. for 120 min. The sheath is removed to obtain a TiAl alloy plate, and a TiAl alloy plate with a thickness of about 2±0.1mm is ob...

Embodiment 2

[0033] This embodiment is a method for preparing a TiAl alloy with low-temperature superplasticity and its components, which is specifically carried out according to the following steps:

[0034] A. Preparation of TiAl alloy slab: Ti-42Al-2Nb-4Mn-0.2C (at.%) alloy with an average grain size of about 80 μm was prepared by vacuum arc melting.

[0035] B. TiAl alloy sheathed rolling: put the above-mentioned TiAl alloy sealed with stainless steel in a furnace with a heating temperature of 1120°C for 60 minutes, adopt a rolling speed of 20±5mm / s, and the deformation of each pass is 20±2% , and the heat preservation time for each pass is 5±2min.

[0036]C. Heat treatment of the TiAl alloy plate: put the TiAl alloy plate obtained above with a sheath in a furnace with a furnace temperature of 950° C. for 180 min. The sheath is removed to obtain a TiAl alloy sheet with a thickness of about 1.8±0.2 mm.

[0037] D. Superplastic forming of TiAl alloy sheet: Put the TiAl alloy coated wit...

Embodiment 3

[0040] This embodiment is a method for preparing a TiAl alloy with low-temperature superplasticity and its components, which is specifically carried out according to the following steps:

[0041] A. Preparation of TiAl alloy slab: Ti-44Al-2Cr-2Mn-0.5Mo-0.3C (at.%) alloy with an average grain size of about 50 μm was prepared by plasma beam cooling furnace melting method.

[0042] B. TiAl alloy sheath rolling: put the above-mentioned TiAl alloy sealed with stainless steel into a furnace with a heating temperature of 1180 ° C for 60 minutes, adopt a rolling speed of 25 ± 5 mm / s, and the deformation of each pass is 20%. The heat preservation time for each pass return to the furnace is 5±3min.

[0043] C. Heat treatment of the TiAl alloy plate: Put the TiAl alloy plate obtained above with a sheath in a furnace with a furnace temperature of 1160° C. for 120 minutes. The sheath is removed to obtain a TiAl alloy sheet with a thickness of about 2.1 mm.

[0044] D. Superplastic formin...

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Abstract

The invention relates to a TiAl alloy with low-temperature superplasticity and a component preparation method thereof, and belongs to the technical field of titanium-aluminum alloy component preparation. A TiAl alloy plate blank is prepared through a powder metallurgy method or an ingot metallurgy method, the TiAl alloy plate blank is wrapped and rolled near the eutectoid temperature, then heat treatment is conducted near the eutectoid temperature, a TiAl alloy plate of a nearly equiaxial structure is prepared, the TiAl alloy plate and a forming die are assembled and then integrally subjectedto low-temperature superplastic deformation, stress relief annealing is conducted, and a TiAl alloy component is prepared. The content of Al in the TiAl alloy designed by the invention is reduced, sothat the TiAl alloy can be formed at a lower temperature, and meanwhile, the prepared TiAl alloy is small in grain size; and then heat preservation is conducted near the eutectoid temperature, a fineand uniform equiaxial structure is further obtained, the content of the gamma phase is high, and it is guaranteed that low-temperature superplastic forming is effectively conducted through the structure; and the method is simple in process and low in requirement for equipment, and superplastic forming of the TiAl alloy can be achieved at the low temperature.

Description

technical field [0001] The invention relates to a TiAl alloy with low-temperature superplasticity and a preparation method for its component, belonging to the technical field of titanium alloy component preparation. Background technique [0002] TiA1 alloy has high specific strength, high specific stiffness, low density, good flame retardancy, high temperature oxidation resistance and creep resistance, and has broad application prospects in aerospace, automobile manufacturing and other industrial fields. In addition to being directly used as structural materials, TiAl alloy sheets can also be used for parts of near-net-shape aviation and aerospace engines, as well as wings, shells, hot zone skins, turbine blades, and missile tails of ultra-high-speed aircraft. However, TiAl has poor deformation ability, and it is difficult to prepare components with complex shapes or large sizes, such as aircraft shells and turbine blades, by traditional methods. The use of superplastic for...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C30/00C22F1/18B21B1/38B21D13/02
CPCB21B1/38B21B2001/386B21D13/02C22C14/00C22C30/00C22F1/183
Inventor 周海涛肖旅徐玉棱孙京丽陈舸
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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