A kind of method that beta-gamma TiAl pre-alloyed powder prepares TiAl alloy plate

A technology of pre-alloyed powder and alloy sheet, which is applied in the field of preparing TiAl alloy sheet, which can solve the problems of macro segregation of TiAl alloy sheet, poor performance of TiAl alloy sheet, uneven chemical composition, etc., and achieve expansion of thermal processing window, powder composition and structure Uniformity, effect of improving hot workability

Active Publication Date: 2016-06-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of macro segregation, dendrite segregation, non-uniform chemical composition of the TiAl alloy plate prepared by the existing method, poor performance and difficult preparation of the TiAl alloy plate prepared, and to provide a beta-gammaTiAl preprepared Method for preparing TiAl alloy plate from alloy powder

Method used

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specific Embodiment approach 1

[0024] Embodiment 1: This embodiment is a method for preparing TiAl alloy plate from beta-gammaTiAl pre-alloyed powder, which is specifically completed according to the following steps:

[0025] A kind of method that beta-gammaTiAl pre-alloyed powder prepares TiAl alloy sheet material is finished according to the following steps specifically:

[0026] 1. Raw material preparation: Weigh the beta-gammaTiAl pre-prepared beta-gammaTiAl with a nominal chemical composition of Ti-(40-44.5)Al-(0.1-10)X-(0.1-1)Z(at%) with a particle size of 0.5μm~325μm. alloy powder;

[0027] In the Ti-(40~44.5)Al-(0.1~10)X-(0.1~1)Z (at%) described in step 1, X is a beta phase stable element; the described beta phase stable element is Mo, A mixture of one or more of Cr, Nb, V, W, Fe and Mn; the Z is a microalloying element; the microalloying element is one or more of B, C and Y a mixture of species;

[0028] The beta-gammaTiAl prealloyed powder whose nominal chemical composition is Ti-(40~44.5)Al-(0...

specific Embodiment approach 2

[0044] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: In step 1, the nominal chemical composition with a particle size of 0.5 μm to 325 μm is Ti-(41~44)Al-(2~9)X- (0.1-1) Z (at%) beta-gammaTiAl pre-alloyed powder. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0045] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step one, the nominal chemical composition of the particle size of 0.5 μm~325 μm is Ti-(42.5~43.5)Al-(2~ 9) Beta-gammaTiAl pre-alloyed powder of X-(0.2-0.5)Z (at%). Other steps are the same as those in Embodiment 1 or 2.

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Abstract

A method for producing TiAl alloy plates through beta-gamma TiAl pre-alloy powder relates to a method for producing TiAl alloy plates. The purpose is to solve problems of the TiAl alloy plates produced by the existing method of macroscopic segregation, dendritic segregation and chemical composition unevenness, poor performance and production difficulty. The method includes: raw material preparing, hot isostatic pressing, sheath packing, high temperature pack rolling and pack removing. The method produces TiAl alloy plates by adopting hot isostatic pressing and follow-up high temperature pack rolling, a large number of disordered body-centered cubic beta phases are introduced in beta-gamma TiAl pre-alloy powder at the processing temperature, thus the hot workability of TiAl alloy can be improved and later TiAl alloy roll forming can be facilitated, and full-density large-size TiAl alloy plates can be produced easily. The method is applicable to producing of TiAl alloy plates.

Description

technical field [0001] The invention relates to a method for preparing TiAl alloy plate. Background technique [0002] TiAl alloy is a new type of lightweight high-temperature structural material with a density less than half that of nickel-based alloys. It has light weight, high high-temperature specific strength and specific stiffness, excellent high-temperature oxidation resistance and creep resistance, high structural stability and resistance Combustibility and other characteristics, and high service temperature, it has become one of the excellent candidate high-temperature structural materials in the fields of contemporary aviation, aerospace industry and civil industry, and has important engineering application potential. However, TiAl alloy has low room temperature plasticity and poor high temperature deformation ability, these factors restrict the engineering application of the alloy. The preparation of high-performance TiAl alloy sheets has been considered the key ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/15B22F3/24B22F1/00C22C14/00
Inventor 孔凡涛陈玉勇周海涛王晓鹏
Owner HARBIN INST OF TECH
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