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A Step-by-Step Hot Isostatic Pressing Preparation Method of High-performance Powder Metallurgy Titanium Alloy

A technology of powder metallurgy and hot isostatic pressing, which is applied in the field of metal material processing and preparation, can solve the problems of reducing the room temperature elongation and high cycle fatigue strength of the alloy, and cannot be completely broken, so as to ensure the shape and size accuracy and avoid plastic loss. The effect of stabilizing and avoiding deterioration

Active Publication Date: 2022-01-14
TAIYUAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0011] However, under the commonly used hot isostatic pressing process conditions, the oxide film on the surface of titanium alloy powder may not be completely broken during the forming process, thereby reducing the room temperature elongation and high cycle fatigue strength of the alloy.

Method used

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  • A Step-by-Step Hot Isostatic Pressing Preparation Method of High-performance Powder Metallurgy Titanium Alloy
  • A Step-by-Step Hot Isostatic Pressing Preparation Method of High-performance Powder Metallurgy Titanium Alloy
  • A Step-by-Step Hot Isostatic Pressing Preparation Method of High-performance Powder Metallurgy Titanium Alloy

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Embodiment Construction

[0036] The specific implementation manner of the present invention will be further described below in conjunction with specific implementation examples and accompanying drawings.

[0037] Comparative Example (Adopting Traditional Simultaneous Heating and Pressurization Hot Isostatic Pressing Process)

[0038] This comparative example uses high-temperature titanium alloy (Chinese brand TA32) powder, and its alloy composition is: Al 5.5%, Sn3.5%, Zr 3.0%, Mo 0.7%, Si 0.3%, Nb 0.4%, Ta 0.4%, more than The amount is Ti.

[0039] Simultaneous temperature rise and pressure hot isostatic pressing process: the TA32 titanium alloy powder prepared by the gas atomization method is sieved, and the particle size is 5-250 μm.

[0040] Fill the TA32 titanium alloy powder into the low carbon steel cylindrical sheath. The outer diameter of the jacket is 120mm, the height is 90mm, and the wall thickness is 3mm. Filling by impact vibration and volume deduction method, the filling relative den...

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Abstract

The invention relates to the technical field of powder metallurgy titanium alloy manufacturing, and discloses a step-by-step hot isostatic pressing preparation method of high-performance powder metallurgy titanium alloy. In the invention, firstly, the bag containing titanium alloy powder is placed at 850-900°C, > Preforming under 100MPa pressure, and then molding at 920-970°C under >100MPa pressure. The step-by-step hot isostatic pressing process designed by the present invention can effectively break the oxide film on the surface of titanium alloy powder, improve the stability of the microstructure of powder metallurgy titanium alloy, and the volume fraction of equiaxed crystals is continuous between 20%-60%. Adjustable, so as to realize the microstructure control of powder components; at the same time, it can significantly improve the plasticity and high cycle fatigue properties of powder metallurgy titanium alloys. The invention has the advantages of simple process, low cost, easy popularization, etc., and is especially suitable for hot isostatic pressing of typical near-α-type and (α+β)-type titanium alloy powders.

Description

technical field [0001] The invention belongs to the field of metal material processing and preparation, and in particular relates to a step-by-step hot isostatic pressing preparation method of high-performance powder metallurgy titanium alloy. Background technique [0002] Powder hot isostatic pressing technology is an advanced near-net forming technology for titanium alloy components, especially suitable for the preparation of large thin-walled or complex-shaped rotary components. Compared with traditional forging + machining technology, it has high material utilization rate, Low cost, short preparation period and other advantages. In addition, due to the advantages of powder metallurgy titanium alloys with uniform composition, fine structure, and mechanical properties close to forged alloys, titanium alloy powder components prepared by hot isostatic pressing technology have been used in aerospace fields, such as titanium alloy hydrogen pumps impeller etc. [0003] The tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/15C22C14/00C22C1/04
CPCB22F3/15B22F3/1258C22C14/00C22C1/0458
Inventor 郭瑞鹏程敏
Owner TAIYUAN UNIV OF TECH
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