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Ti-Al-Cr-Mo alloy and preparation method of plate thereof

An alloy sheet and alloy technology, which is applied in the field of powder metallurgy material preparation and thermal deformation, can solve the problems of inability to prepare large-sized alloy sheets, easy cracking of large-sized ingots, and large material loss, and achieve uniform microstructure, The effect of good surface quality and reduced equipment requirements

Active Publication Date: 2010-09-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the TiAl-based alloy sheets prepared by the above two methods have the following disadvantages: (1) the blanks used by Junpinlin et al. before rolling are forged hot isodiametric pressing (HIP), and the forging process has a large material loss and complicated process; ( 2) The billet before rolling used by Chen Yuyong et al. is the ingot prepared by the melting casting method. When the TiAl-based alloy ingot is prepared by the melting casting method, the melting and casting process requires high equipment, and the large-sized billet is easy to crack and is very difficult to prepare. Therefore, the ingot The size is small, and it is impossible to prepare large-size alloy sheets
At present, there is no relevant literature report on the process of directly rolling the Ti-Al-Cr-Mo alloy billet prepared by powder metallurgy without forging

Method used

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  • Ti-Al-Cr-Mo alloy and preparation method of plate thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Ti-45Al-0.5Cr-0.1Mo alloy pre-alloyed powder was used to prepare billet through HIP. The process parameters of HIP were as follows: temperature was 1100°C, pressure was 120MPa, and holding time was 2h. Cut a cuboid blank with a thickness of 8mm from the Ti-Al-Cr-Mo alloy blank, and machine the alloy cuboid blank to make the surface roughness of the blank not higher than 3.2; use a pure titanium plate with a thickness of 1mm to make the sheath , and place the blank in the bag. Put the Ti-Al-Cr-Mo alloy with a sheath in a heating furnace with a temperature of 1100°C to preheat, and the preheating time is 20 minutes. At the same time, heat the rolls of the rolling mill to make the temperature of the rolls reach 100°C about. The preheated Ti-Al-Cr-Mo alloy with sheath is rolled; the specific process parameters of rolling are: the rolling start temperature is 1100°C, and the deformation speed is converted to a strain rate of about 0.1s -1 , the deformation of each pass is ...

Embodiment 2

[0032] Ti-47Al-3Cr-0.2Mo alloy pre-alloyed powder was used to prepare blanks through HIP. The process parameters of HIP were as follows: temperature was 1200°C, pressure was 140MPa, and holding time was 4h. Cut a cuboid blank with a thickness of 8mm from the Ti-Al-Cr-Mo alloy blank, and machine the alloy cuboid blank to make the surface roughness of the blank not higher than 3.2; use a pure titanium plate with a thickness of 4mm to make the sheath , and place the blank in the bag. Put the sheathed Ti-Al-Cr-Mo alloy into a heating furnace with a temperature of 1200°C for preheating, and the preheating and holding time is 30 minutes. At the same time, heat the rolls of the rolling mill to make the temperature of the rolls reach 200°C about. Roll the preheated Ti-Al-Cr-Mo alloy with a sheath; the specific process parameters for rolling are: the rolling start temperature is 1200°C, and the deformation speed is converted to a strain rate of about 0.6s -1 , the deformation of each...

Embodiment 3

[0034]Ti-49Al-5Cr-0.3Mo alloy pre-alloyed powder was used to prepare blanks through HIP. The process parameters of HIP were: temperature 1300°C, pressure 180MPa, holding time 6h. A cuboid blank with a thickness of 10 mm is cut from the Ti-Al-Cr-Mo alloy blank, and the alloy cuboid blank is machined so that the surface roughness of the blank is not higher than 3.2. A sheath is made of a pure titanium plate with a thickness of 8mm, and the blank is placed in the sheath. Put the sheathed Ti-Al-Cr-Mo alloy into a heating furnace with a temperature of 1300°C for preheating, and the preheating and holding time is 60 minutes. At the same time, heat the rolls of the rolling mill to make the temperature of the rolls reach 300°C about. Roll the preheated Ti-Al-Cr-Mo alloy with a sheath; the specific process parameters for rolling are: the rolling start temperature is 1300°C, and the deformation speed is converted to a strain rate of about 1s -1 , the deformation of each pass is about ...

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Abstract

The invention relates to a Ti-Al-Cr-Mo alloy and a preparation method of a plate thereof. The alloy comprises the following components in percentage by weight: 45-49 Ti, 0.5-5 Al, 0.1-0.3 Cr, and the balance of Mo; and the preparation method of the plate of the alloy comprises the following steps of: 1 preparing the Ti-Al-Cr-Mo alloy by adopting an HIP (Hot Isostatic Pressing) method; 2 cutting to obtain a blank required by rolling from the alloy prepared by adopting the HIP method; 3 putting the blank obtained in the step 2 into a pure titanium plate sheath; 4 putting the Ti-Al-Cr-Mo alloy with the sheath into a heating furnace and preheating; and 5 carrying out multi-pass rolling at small pass and low deformation speed on the Ti-Al-Cr-Mo alloy with the sheath, then putting into an electric furnace and cooling with the furnace; and removing the sheath to obtain the Ti-Al-Cr-Mo alloy plate. The invention solves the difficult problems that the Ti-Al-Cr-Mo alloy is more brittle and difficult to deform at high temperature and prepare the Ti-Al-Cr-Mo alloy plate in a rolling manner. The invention has simple process and method as well as reasonable process parameters; an alloy ingot blank prepared by adopting the HIP method is directly rolled by adopting the sheath; the plate prepared by adopting the rolling manner has even deformation; and the rolled alloy has even and tiny tissue, no edge crack and surface crack and good surface quality and is suitable for industrialized production.

Description

technical field [0001] The invention discloses a Ti-Al-Cr-Mo alloy and a preparation method thereof, and belongs to the technical field of powder metallurgy material preparation and thermal deformation thereof. Background technique [0002] TiAl-based alloy has high specific strength, high specific stiffness, low density, good flame retardancy, high temperature oxidation resistance and creep resistance. It is a very potential light-weight high-temperature structural material. It has broad application prospects. However, TiAl-based alloys are brittle and are difficult to deform. It is difficult to process deformation at room temperature and high temperature, especially the rolling deformation of plates. Plate preparation technology is one of the important research directions of TiAl-based alloys. Scholars at home and abroad have achieved certain results in the research on TiAl-based alloy sheet rolling. For example, in the late 1980s, Japan's isothermal rolling and the Unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/04C22F1/18
Inventor 李慧中李洲李滔刘咏梁宵鹏曾敏
Owner CENT SOUTH UNIV
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