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A kind of hydrogenation improves ti 2 Alnb based alloy microstructure method

A technology of microstructure and base alloy, applied in the field of improving the microstructure of Ti2AlNb-based alloy, can solve the problems of difficult to control the degree of uniformity of the structure, high phase transition temperature, difficult to control the phase composition, etc., to improve the microstructure of Ti2AlNb-based alloy and reduce the transformation. temperature, the effect of improving uniformity

Active Publication Date: 2016-08-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is to solve existing Ti 2 AlNb-based alloys have high phase transition temperature, difficult to control phase composition, difficult to control microstructure uniformity and difficult hot processing, and provide a hydrogen-improved Ti 2 AlNb based alloy microstructure method

Method used

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  • A kind of hydrogenation improves ti <sub>2</sub> Alnb based alloy microstructure method
  • A kind of hydrogenation improves ti <sub>2</sub> Alnb based alloy microstructure method
  • A kind of hydrogenation improves ti <sub>2</sub> Alnb based alloy microstructure method

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specific Embodiment approach 1

[0011] Specific implementation mode 1: In this implementation mode, a kind of hydrogenation improves Ti 2 The method of AlNb base alloy microstructure is to carry out according to the following steps:

[0012] 1. Hydrogen charging treatment: Ti 2 The AlNb-based alloy is machined to remove the oxide layer and cleaned with acetone for 3 to 5 times, then placed in the tube-type hydrogen-setting furnace, and the tube-type hydrogen-setting furnace is evacuated to an absolute pressure of 1×10 -3 Pa, then fill in high-purity argon until the relative pressure in the tubular hydrogen furnace is -0.04MPa~-0.02MPa, and then pass in hydrogen at a temperature of 700℃~800℃, and its partial pressure is 0.05 MPa~0.15MPa, heat preservation for 2h~4h, and then reduce the temperature in the tubular hydrogenation furnace to room temperature at a rate of 10℃ / min, and finally obtain the hydrogenation Ti 2 AlNb-based alloy billet A; the hydrogenated Ti 2 The mass percentage of hydrogen atoms in t...

specific Embodiment approach 2

[0017] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the hydrogenation Ti described in step one 2 The mass percentage of hydrogen atoms in the AlNb-based alloy blank A is 0.2%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the hydrogenation Ti described in step one 2 The mass percentage of hydrogen atoms in the AlNb-based alloy blank A is 0.3%. Others are the same as in the first or second embodiment.

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Abstract

A method for improving a microstructure of a Ti2AlNb base alloy by hydrogen treatment relates to a method for improving a microstructure of a Ti2AlNb base alloy. The method solves the problems that the phase-transition temperature of the conventional Ti2AlNb base alloy is high, the phase composition and the degree of uniformity of the structure are difficult to control, and the hot processing is difficult. The method comprises: 1, hydrogen charging treatment; 2, heat treatment; and 3, dehydrogenation treatment. The method is used for improving a structure of a Ti2AlNb base alloy.

Description

technical field [0001] The invention relates to an improved Ti 2 A method for the microstructure of AlNb-based alloys. Background technique [0002] With the development of aerospace technology, the operating speed of spacecraft continues to increase, the requirements for payload / structural quality are also increasing, and high-performance metal materials are also developing rapidly. Ti 2 AlNb-based alloys have high specific strength, specific stiffness, good high-temperature creep properties and oxidation resistance, and have become a research hotspot. Ti 2 AlNb-based alloys are based on the O phase, consisting of O phase, B2 phase and α 2 Phase composition, in which O phase is a strong and tough phase, B2 is a plastic phase, and α 2 phase is brittle phase. For Ti-22Al-25Nb alloy, during heating from low temperature to high temperature, O→α 2 +B2+O→α 2 +B2 phase change. The internal microstructure of the material determines its external processing performance and pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00C22F1/02
Inventor 宗影影温道胜单德彬邵斌郭斌
Owner HARBIN INST OF TECH