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Method for improving microstructure of casted Ti3Al alloy by hydrogenation-hot isostatic pressing

A hot isostatic pressing and microstructure technology, applied in the field of heat treatment, can solve the problems of shrinkage porosity, grain growth, pores and grains, etc., and achieve the effect of eliminating casting defects and improving mechanical properties.

Active Publication Date: 2013-06-05
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the casting process often causes many casting defects, such as coarse grain, shrinkage cavity, shrinkage porosity, pores and uneven grain, etc. The existence of these defects will seriously affect the performance of the casting, especially the tensile strength, fatigue performance and Plasticity, therefore, for castings with higher performance requirements, hot isostatic pressing is usually carried out before delivery to eliminate these casting defects
However, due to the high processing temperature of the hot isostatic pressing process, the grains will grow during the hot isostatic pressing process, making the original coarse casting structure more coarse, which offsets the hot isostatic pressing process to a certain extent. Improvement of the mechanical properties of the alloy

Method used

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  • Method for improving microstructure of casted Ti3Al alloy by hydrogenation-hot isostatic pressing
  • Method for improving microstructure of casted Ti3Al alloy by hydrogenation-hot isostatic pressing

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Embodiment 1

[0020] Embodiment 1: This embodiment is realized through the following steps: Step 1, hot isostatic pressing: casting Ti 3 Al alloy parts are subjected to hot isostatic pressing treatment in a hot isostatic pressing furnace. Pressed Cast Ti 3 After the Al alloy parts were cleaned with acetone, they were placed in a tubular hydrogen furnace, and the furnace was evacuated to 10 -3 Pa, then raise the temperature in the furnace to 850°C, keep it warm for 15 minutes, and fill in 1.2% hydrogen according to the weight percentage of the castings in the furnace. According to the weight of the casting before entering the furnace, it can be seen that the weight of the casting is 460g, and the weight of the casting is 5.52g according to the proportion. Cool to room temperature to obtain hydrogenated Ti 3 Al alloy parts. Step 3, solid solution and aging treatment: put the parts treated in step 2 into a heat treatment furnace, raise the furnace temperature to 1050°C, and keep it warm fo...

Embodiment 2

[0021] Embodiment 2: This embodiment is realized through the following steps: Step 1, hot isostatic pressing: casting Ti 3 Al alloy parts are subjected to hot isostatic pressing treatment in a hot isostatic pressing furnace. Pressed Cast Ti 3 After the Al alloy parts were cleaned with acetone, they were placed in a tubular hydrogen furnace, and the furnace was evacuated to 10 -3 Pa, then raise the temperature in the furnace to 700°C, keep it warm for 15 minutes, and fill in 1% hydrogen according to the weight percentage of the castings in the furnace. According to the weight of the casting before entering the furnace, it can be seen that the weight of the casting is 1230g, and the weight of the casting is 12.3g according to the proportion. Cool to room temperature to obtain hydrogenated Ti 3 Al alloy parts. Step 3, solid solution and aging treatment: put the parts treated in step 2 into a heat treatment furnace, raise the furnace temperature to 1000°C, and keep it warm for...

Embodiment 3

[0022] Embodiment 3: This embodiment mode is realized through the following steps: Step 1, hot isostatic pressing: casting Ti 3 Al alloy parts are subjected to hot isostatic pressing treatment in a hot isostatic pressing furnace. Pressed Cast Ti 3 After the Al alloy parts were cleaned with acetone, they were placed in a tubular hydrogen furnace, and the furnace was evacuated to 10 -3Pa, then raise the temperature in the furnace to 780°C, keep it warm for 15 minutes, and fill in 1% hydrogen according to the weight percentage of the castings in the furnace. According to the weight of the casting before entering the furnace, it can be seen that the weight of the casting is 860g, and the weight of the casting is 9.4g according to the proportion. Cool to room temperature to obtain hydrogenated Ti 3 Al alloy parts. Step 3, solid solution and aging treatment: put the parts treated in step 2 into a heat treatment furnace, raise the furnace temperature to 1020°C, and keep it warm f...

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Abstract

The invention belongs to the technical field of heat treatment and relates to a method for improving a microstructure of a casted Ti3Al alloy by hydrogenation-hot isostatic pressing. The method disclosed by the invention comprises the following steps: 1) performing hot isostatic pressing process treatment on the casted Ti3Al alloy; 2) performing hydrogenation treatment on the Ti3Al alloy after the hot isostatic pressing process treatment; 3) performing solid solution and aging treatment on the Ti3Al after the hydrogenation treatment; and 4) finally performing vacuum annealing treatment. According to the method disclosed by the invention, on the one hand, the hot isostatic pressing process is utilized for repairing holes and other defects in the casted Ti3Al alloy and improving the compactness of the alloy; and on the other hand, reversible alloying action and various phase changes of hydrogen in the casted Ti3Al alloy are further utilized for thinning the microstructure of the casted Ti3Al alloy and making up for adverse effects on the performances of the alloy due to coarse grains. Therefore, the holes, shrink holes and other casting defects of the casted Ti3Al alloy and the problem of a coarse structure can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and relates to a hydrogenation-hot isostatic pressing improved casting Ti 3 Al alloy microstructure method Background technique [0002] Ti 3 Al-based alloys have incomparable specific strength, high-temperature creep resistance and oxidation resistance that other alloys cannot match, so they are considered to be one of the first-choice materials for important structural parts of new aviation and aerospace engines. At present, the casting process is to prepare Ti 3 One of the main methods for Al-based alloy components, and also the preferred forming method for some structurally complex parts. [0003] However, the casting process often causes many casting defects, such as coarse grain, shrinkage cavity, shrinkage porosity, pores and uneven grain, etc. The existence of these defects will seriously affect the performance of the casting, especially the tensile strength, fatigue performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 赵嘉琪林莺莺赵鹏黄东南海
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS