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Method of preparing TiAl alloy plate by virtue of spark plasma sintering and canning hot rolling

A discharge plasma, alloy sheet technology, applied in the directions of additive manufacturing, process efficiency improvement, energy efficiency improvement, etc., can solve the problems of uneven chemical composition, inconsistent structure, poor sheet performance, etc., and achieve small grain size and deformation ability. Good results with good hot workability

Active Publication Date: 2015-05-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of non-uniform chemical composition, inconsistent structure, poor performance and difficult preparation in the existing TiAl alloy sheet preparation method, and provide a method for preparing TiAl alloy sheet by spark plasma sintering and sheathed hot rolling method

Method used

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specific Embodiment approach 1

[0028] Specific Embodiment 1: This embodiment is a method for preparing TiAl alloy plates by spark plasma sintering and sheathed hot rolling, which is specifically completed according to the following steps:

[0029] 1. Raw material preparation: Weigh TiAl pre-alloyed powder whose nominal chemical composition is Ti-(40-50)Al-(0.1-10)X(at%) with a particle size of 0.5 μm-325 μm;

[0030] In the Ti-(40~50)Al-(0.1~10)X (at%) described in step 1, X is Mo, Cr, Nb, V, Si, Fe, Zr, Mn, B, C, W and One or a mixture of several of Y;

[0031] The TiAl pre-alloyed powder whose nominal chemical composition is Ti-(40-50)Al-(0.1-10)X(at%) described in step 1 is prepared by inert gas atomization technology or plasma rotating electrode atomization technology ;

[0032] 2. Spark plasma sintering:

[0033] Put the TiAl pre-alloyed powder weighed in step 1 into the graphite mold, under the pressure of 10MPa-200MPa, the temperature of 900°C-1300°C and the degree of vacuum of 10 -4 Sintering at...

specific Embodiment approach 2

[0048] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, the nominal chemical composition whose particle size is 0.5 μm~325 μm is Ti-(42~45)Al-(0.3~10)X( at%) TiAl pre-alloyed powder. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0049] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, the nominal chemical composition of the particle size of 0.5 μm~325 μm is Ti-(45~48)Al-(0.2~325 μm) 6.5) TiAl pre-alloyed powder of X(at%). Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method of preparing a TiAl alloy plate by virtue of spark plasma sintering and canning hot rolling, relates to a preparation method of an alloy plate and aims at solving the problems of uneven chemical components, inconsistency in tissues, poor performance of the plate and difficulty in preparation of the traditional preparation method of the TiAl alloy plate. The method comprises the following steps: carrying out spark plasma sintering on TiAl pre-alloyed powder firstly to prepare a pre-rolled plate slab, and then preparing the TiAl alloy plate by virtue of a canning hot rolling method. According to the method disclosed by the invention, the TiAl alloy plate slab prepared by spark plasma sintering is high in density, fine in tissue, uniform in components, excellent in performances, good in deformability, convenient in subsequent formation of the TiAl alloy plate, fine in grain size of the prepared plate and excellent in mechanical properties, is capable of carrying out high-temperature canning rolling on TiAl alloy at a relatively low temperature and high strain rate and is suitable for preparing the TiAl alloy plate.

Description

technical field [0001] The invention relates to a method for preparing alloy plates. Background technique [0002] With the rapid development of industries such as aerospace and civil movement, higher requirements are put forward for the performance of engine parts. At present, nickel-based high-temperature alloys and titanium alloys are mostly used in aviation and aerospace engine parts. Nickel-based alloys have shortcomings such as high quality, high specific weight, and low specific strength, while titanium alloys have shortcomings such as low room temperature elastic modulus, high temperature creep resistance, and insufficient service temperature, which gradually cannot meet the technical requirements of aviation and aerospace engines. TiAl alloy has low density, high specific strength, high specific stiffness, and good high-temperature oxidation resistance and creep resistance. It is a very potential light-weight high-temperature structural material and has a wide range...

Claims

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Application Information

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IPC IPC(8): B21C37/02B22F3/105
CPCB21C37/02B22F10/00B22F10/30Y02P10/25
Inventor 孔凡涛陈玉勇周海涛王晓鹏
Owner HARBIN INST OF TECH
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