Method for improving forging properties of gamma-TiAl alloy through hydrogenation

A technology of hydrogenation and alloying, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of increasing alloy density, and achieve the effects of improving mold life, reducing deformation resistance, and reducing stacking fault energy

Inactive Publication Date: 2015-01-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the density of Mo, V, Nb, Cr and Ta metals is close to or even higher than that of high-temperature nickel-based alloys. Adding these elements to γ-TiAl alloys will undoubtedly increase the density of the alloy

Method used

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  • Method for improving forging properties of gamma-TiAl alloy through hydrogenation
  • Method for improving forging properties of gamma-TiAl alloy through hydrogenation

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Experimental program
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specific Embodiment approach 1

[0013] Specific embodiment one: In this embodiment, a method of introducing hydrogen to improve the forging performance of γ-TiAl alloy is carried out according to the following steps:

[0014] 1. Use mechanical processing to remove the oxide layer on the surface of the γ-TiAl alloy and wash it with acetone for 3 to 5 times, then place it in the tubular hydrogen furnace, and evacuate the tube hydrogen furnace 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 feed hydrogen at a temperature of 700°C~800°C, and the partial pressure is 0.05 MPa~0.15MPa, keep warm for 2h~4h, cool to room temperature with the furnace, and finally obtain the hydrogenated γ-TiAl alloy blank A; the hydrogen atomic percentage in the hydrogenated γ-TiAl alloy blank A is 0.2%~1%;

[0015] 2. Spray the high-temperature antioxidant on the surface of the hydrogenated γ-TiAl alloy billet A obtained i...

specific Embodiment approach 2

[0021] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the atomic percentage of hydrogen in the γ-TiAl alloy blank A described in step 1 is 0.4%-0.9%. Others are the same as the first embodiment.

specific Embodiment approach 3

[0022] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the atomic percentage of hydrogen in the γ-TiAl alloy blank A described in step 1 is 0.6%. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for improving forging properties of gamma-TiAl alloy through hydrogenation, relates to the method for improving the forging properties of the gamma-TiAl alloy, and aims to improve the hot forming properties of the gamma-TiAl alloy under the conditions that the density of the existing gamma-TiAl alloy is not increased, the creep resistance is not reduced, and the room-temperature ductility is not reduced. The method comprises the following steps: firstly, filling hydrogen to a gamma-TiAl alloy green body; secondly, spraying a high-temperature antioxidant on the surface of the hydrogenated gamma-TiAl alloy billet and preheating; thirdly, forging the hydrogenated gamma-TiAl alloy billet at high temperature, and performing heat insulation to obtain a hydrogenated gamma-TiAl alloy forged piece; fourthly, dehydrogenating the hydrogenated gamma-TiAl alloy forged piece. The method disclosed by the invention is used for improving the forging properties of the gamma-TiAl alloy.

Description

technical field [0001] The invention relates to a method for improving the forging performance of gamma-TiAl alloy by adding hydrogen. Background technique [0002] TiAl alloy has low density, high specific strength, high specific stiffness, high elastic modulus, high temperature creep resistance and oxidation resistance, so it is considered to be one of the most potential high temperature structural materials. Aerospace engine is an important application field of TiAl alloy. At present, nickel-based or other high-density superalloys are mostly used in high-temperature structural components of aerospace engines, and replacing these high-density alloys with light-weight alloys is an important way to improve engine thrust-to-weight ratio and thus improve engine performance. Compared with the widely used nickel-based superalloys, one of the most important advantages of TiAl alloys is that the density of TiAl alloys is low, which is only about half of that of nickel-based super...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C23C8/08
CPCB23P15/00C22F1/183
Inventor 宗影影温道胜单德彬郭斌
Owner HARBIN INST OF TECH
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