Preparation method for TiAl alloy plate of uniform structure

An alloy sheet and alloy technology, applied in the field of TiAl alloy sheet preparation, can solve the problems of TiAl alloy sheet structure unevenness, comprehensive performance decline, etc., and achieve the effects of saving manpower and financial resources, reducing preparation costs, and improving microstructure

Inactive Publication Date: 2016-08-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of the existing TiAl alloy plate with uneven structure and decreased comprehensive performance, and provide a method for preparing a TiAl alloy plate with uniform structure

Method used

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Experimental program
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specific Embodiment approach 1

[0020] Embodiment 1: This embodiment is a method for preparing a TiAl alloy plate with a uniform structure, specifically as follows:

[0021] 1. Billet making: homogenizing heat treatment and hot isostatic pressing of the ingot obtained by smelting to obtain a TiAl alloy prefabricated billet, and processing the prefabricated billet into a cuboid billet by mechanical processing to obtain a cuboid TiAl alloy rolled billet;

[0022] The homogenization heat treatment parameters described in step 1 are: 800°C-1100°C heat preservation for 6h-48h;

[0023] The hot isostatic pressing treatment parameters described in step 1 are: the hot isostatic pressing temperature is 1000°C to 1250°C, the hot isostatic pressing pressure is 140MPa to 200MPa, and the hot isostatic pressing time is 1h to 5h;

[0024] The thickness of the cuboid TiAl alloy rolled blank described in step 1 is 3 mm to 30 mm;

[0025] 2. Sheathing: The cuboid TiAl alloy rolling blank obtained in step 1 is surface-polishe...

specific Embodiment approach 2

[0034] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the cuboid TiAl alloy rolling stock composition described in step 1 is: Ti-(43~45)Al-(6~9)Nb-(0.1 ~1) X (at.%), wherein X is one of element B, element Si, element C or element Y or a mixture of several of them. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0035] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that the cuboid TiAl alloy rolling blank composition described in step 1 is: Ti-(43~45)Al-6(Nb,V)- (0.1~1)X(at.%); wherein X is one of element B, element Si, element C or element Y or a mixture of several of them. Other steps and parameters are the same as those in Embodiment 1 or 2.

[0036] In this embodiment, 6(Nb, V) in Ti-(43-45)Al-6(Nb,V)-(0.1-1)X(at.%) means that the total amount of element Nb and element V is 6 at.% , but the atomic percentage of element Nb and element V is any ratio.

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Abstract

The invention provides a preparation method for a TiAl alloy plate of a uniform structure and relates to the preparation method for the TiAl alloy plate. The preparation method for the TiAl alloy plate of the uniform structure aims at solving the problems that the structure of an existing TiAl alloy plate is nonuniform, and the comprehensive performance is reduced. The preparation method comprises the steps that 1, blank preparing is conducted to obtain a cuboid TiAl alloy rolling blank; 2, sleeving is conducted to obtain a sleeved TiAl alloy blank; 3, double-step heat treatment is conducted before high-temperature rolling to obtain a TiAl alloy blank subjected to double-step heat treatment; 4, high-temperature rolling and heat preserving during passes are conducted to obtain a TiAl alloy plate subjected to high-temperature rolling; 5, stress relief annealing is conducted to obtain an annealed TiAl alloy plate; and 6, a sleeve is removed through machining, so that the TiAl alloy plate is obtained. The preparation method for the TiAl alloy plate of the uniform structure has the advantage that the TiAl alloy plate of the uniform structure is obtained by adopting double-step heat treatment before rolling. The preparation method is mainly used for preparing the TiAl alloy plate of the uniform structure.

Description

technical field [0001] The invention relates to a preparation method of a TiAl alloy plate. Background technique [0002] As a new type of high-temperature lightweight structural material, TiAl alloy has a low density (3.9-4.2g / cm 3 ), high melting point, high specific strength and specific stiffness, excellent oxidation resistance and creep performance, and has broad application potential in automobiles, aerospace engines and other high-temperature structural parts. However, defects such as narrow thermal processing window, poor high-temperature deformation ability, easy cracking during deformation, uneven microstructure after thermal deformation, and poor room temperature plasticity of TiAl alloy restrict the practical engineering application of TiAl alloy. [0003] At present, a lot of research has been carried out on TiAl alloy plates at home and abroad. Among them, ingot metallurgy is one of the effective means to prepare TiAl alloy plates. The main processes are: melt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C14/00
CPCC22C14/00C22F1/183
Inventor 陈玉勇张宇孔凡涛王晓鹏
Owner HARBIN INST OF TECH
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