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Multi-element microalloyed titanium alloy processing method

A technology of microalloying and processing method, which is applied in the processing field of multi-component microalloying titanium alloy, can solve the problems of uneven structure, segregation of solute atoms, hindering recrystallization, etc., and achieve uniform grain size, uniform deformation and good quality. The effect of comprehensive mechanical properties

Active Publication Date: 2013-09-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the thermal processing of multi-element microalloyed titanium alloys, a large number of dislocations will be generated, which will induce the segregation of solute atoms, and the pinning effect of the segregated solute atoms on the movement of dislocations will seriously hinder the progress of recrystallization and cause thermal processing extremely heterogeneous tissue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This example is based on the processing of a multi-component microalloyed titanium alloy with a weight percentage of TiB and TiC of 0.5%, and the molar ratio of TiB and TiC is 4:1.

[0018] Step 1: using a vacuum consumable electric arc furnace to prepare a multi-element microalloyed titanium alloy ingot, the weight percentage of TiB and TiC is 0.5%, and the molar ratio of TiB and TiC is 4:1;

[0019] Step 2: Forging the billet in the β range (1150°C);

[0020] Step 3: Forging in the α+β two-phase interval (840°C);

[0021] Step 4: Carry out recrystallization annealing heat treatment on the material. The heat treatment temperature is 830°C. After heat treatment, use mechanical processing to remove defects such as scale, shrinkage cavity, and slag inclusion;

[0022] Step 5: Isothermally forging the material at 830 °C with a strain rate of 1 × 10 -3 / s.

[0023] In this embodiment, the deformation is uniform during the isothermal forging process, the processed materia...

Embodiment 2

[0025] This example is based on the processing of a multi-element microalloyed titanium alloy with 1% by weight of TiB and TiC, and the molar ratio of TiB and TiC is 4:1.

[0026] Step 1: using a vacuum consumable electric arc furnace to prepare a multi-component microalloyed titanium alloy ingot, the weight percentage of TiB and TiC is 1%, and the molar ratio of TiB and TiC is 4:1;

[0027] Step 2: Forging the billet in the β range (1150°C),

[0028] Step 3: Forging in the α+β two-phase interval (830°C);

[0029] Step 4: Carry out recrystallization annealing heat treatment on the material. The heat treatment temperature is 840°C. After heat treatment, use mechanical processing to remove defects such as scale, shrinkage cavity, and slag inclusion;

[0030] Step 5: The material is then isothermally forged at 840°C with a strain rate of 2×10 -2 / s.

[0031] In this embodiment, the deformation is uniform during the isothermal forging process, the processed material has a unifo...

Embodiment 3

[0033] This example is based on the processing of a multi-component microalloyed titanium alloy with a weight percentage of TiB and TiC of 2%, and the molar ratio of TiB and TiC is 4:1.

[0034] Step 1: using a vacuum consumable electric arc furnace to prepare a multi-component microalloyed titanium alloy ingot, the weight percentage of TiB and TiC is 2%, and the molar ratio of TiB and TiC is 4:1;

[0035] Step 2: Forging the billet in the β range (1140°C),

[0036] Step 3: Forging in the α+β two-phase interval (830°C);

[0037] Step 4: Carry out recrystallization annealing heat treatment on the material. The heat treatment temperature is 840°C. After heat treatment, use mechanical processing to remove defects such as scale, shrinkage cavity, and slag inclusion;

[0038] Step 5: Isothermally forging the material at 840°C with a strain rate of 1×10 -3 / s.

[0039] In this embodiment, the deformation is uniform during the isothermal forging process, the processed material has...

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Abstract

The invention discloses a multi-element microalloyed titanium alloy processing method in the fields of material science and engineering. The method comprises the steps of: forging and cogging a titanium alloy ingot in a beta interval; then forging in an alpha-beta two-phase interval; carrying out thermal treatment and machining on the material in an environment with temperature between a recrystallization temperature and a beta-transformation temperature; and finally carrying out isothermal forging forming in the alpha-beta two-phase interval. The multi-element microalloyed titanium alloy processing method is suitable for large-scale industrial production, especially for processing of spare parts and materials in batches and ensures even deformation in the isothermal forging process; the processed parts or materials are even in grain size; the beta-phase is greatly refined and the alpha-phase is completely balled; and the multi-element microalloyed titanium alloy processing method has good comprehensive mechanic performance.

Description

technical field [0001] The invention relates to a titanium alloy processing method in the field of material science and engineering, in particular to a processing method of a multi-element microalloyed titanium alloy containing trace amounts of TiB and TiC. Background technique [0002] During the thermal processing of multi-element microalloyed titanium alloys, a large number of dislocations will be generated, which will induce the segregation of solute atoms, and the pinning effect of the segregated solute atoms on the movement of dislocations will seriously hinder the progress of recrystallization and cause thermal processing The resulting tissue is extremely uneven. The multi-element micro-alloyed titanium alloy processing method involved in the present invention is to heat-process and heat-treat the titanium alloy ingot prepared by the melting and casting method, and then perform isothermal forging processing again. The heat treatment temperature is between the recryst...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C14/00
Inventor 吕维洁孙曙宇王立强覃继宁张荻
Owner SHANGHAI JIAO TONG UNIV
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