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Heat treatment method of iron-containing metastable beta titanium alloy

A heat treatment method and β titanium alloy technology, which are applied in the direction of process efficiency improvement, additive manufacturing, energy efficiency improvement, etc., can solve the problems of poor heat treatment performance stability and reproducibility, deterioration, excessive grain growth, etc., to ensure stability. performance and reproducibility, avoid irreversible deterioration, block the effect of re-segregation

Active Publication Date: 2021-12-31
SHANGI INST FOR ADVANCED MATERIALSNANJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the commonly used treatment method is mainly solution aging heat treatment. Iron-containing metastable β titanium alloy has very good process plasticity and cold formability after solution treatment, and has good welding performance. After aging heat treatment, it can reach very high strength. , but it is difficult to obtain titanium alloy materials with medium strength and good plasticity in the whole process, so that further strong plasticity matching cannot be carried out to meet the needs of different applications
[0004] In addition, traditional solution treatment is usually carried out near the phase transition point, and the iron-rich region preferentially undergoes β-phase transformation. After the transformation, the solubility of iron elements continues to increase, and then β spots are formed, resulting in a sharp decline in plasticity and fatigue properties. The performance stability and reproducibility are poor, which affects the performance stability and reproducibility of iron-containing metastable β-titanium alloys. However, if the solution temperature is increased, excessive grain growth will occur, which will lead to irreversible deterioration of alloy properties.

Method used

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  • Heat treatment method of iron-containing metastable beta titanium alloy
  • Heat treatment method of iron-containing metastable beta titanium alloy
  • Heat treatment method of iron-containing metastable beta titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Step 1. Vibrate Ti35421 metal powder with a specification of 53-235 μm into the hot isostatic pressing jacket, vacuumize and seal, and prepare Ti35421 rods according to the hot isostatic pressing process of 840 °C / 4h / FC under a pressure of 140 MPa. Pick Rod samples.

[0077] Ti35421 gold phase at this stage figure 1 , it can be seen from the figure that at this time, the grain boundary is a continuous α phase, which will prevent the diffusion of iron elements between grains; there are relatively short primary α phases distributed inside the grains, and cracks can easily bypass the α phase for diffusion. Less intense.

[0078] Step 2. Three samples were randomly taken for chemical composition testing, and the results are shown in Table 1.

[0079] Table 1

[0080]

[0081] Step 3. The metallographic structures at 800°C, 810°C, 815°C and 820°C were respectively tested by quenching metallographic method, and the β phase transition temperature was determined to be a...

Embodiment 2

[0093] Step 1. Take the Ti35421 metal powder with a specification of 75-180 μm, and use the laser directed energy deposition process to prepare a block sample, in which the laser power is 1600W, the laser spot diameter is 3mm, the scanning distance is 1.6mm, the scanning speed is 600mm / min, and the prepared layer thickness is 0.5mm ,Pick Rod samples.

[0094] Step 2: Take the three left, middle and right positions of the original Ti35421 block for chemical composition testing, and the results are shown in Table 3.

[0095] table 3

[0096]

[0097]Step 3. The metallographic structure of 790°C, 800°C, 810°C and 820°C was tested by quenching metallographic method, and the β phase transition temperature was determined to be 800-810°C, and the phase transition temperature was determined to be about 805°C by differential thermal analysis .

[0098] Step 4. Place the Ti35421 titanium alloy material described in step 1 in an air resistance furnace, raise the temperature to 910...

Embodiment 3

[0106] Step 1. Use the powder metallurgy process to prepare samples. Vibrate the Ti35421 metal powder with a specification of 53-235 μm into the hot isostatic pressure jacket, vacuumize and seal it, and heat it at 840°C / 4h / FC under a pressure of 140MPa. Ti35421 rods were prepared by pressing process, taking Rod samples.

[0107] Step 2. Three samples were randomly taken for chemical composition testing, and the results are shown in Table 5.

[0108] table 5

[0109]

[0110] Step 3. The metallographic structures at 800°C, 810°C, 815°C and 820°C were respectively tested by quenching metallographic method, and the β phase transition temperature was determined to be about 815°C, and the accuracy of the heat treatment furnace was confirmed.

[0111] Step 4. Raise the temperature of the air resistance furnace to 765° C., place the Ti35421 titanium alloy rod-shaped sample described in step 1 in the furnace for 1 hour, and then take it out of the furnace and cool it to room tem...

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Abstract

The invention provides a heat treatment method of an iron-containing metastable beta titanium alloy. The method comprises the following steps: preparing an iron-containing metastable beta titanium alloy molded part through an isostatic pressing technology or an additive manufacturing technology, carrying out high-temperature heat treatment on the iron-containing metastable beta titanium alloy molded part, and cooling to room temperature along with a furnace to obtain a first iron-containing metastable beta titanium alloy. According to the heat treatment method, the mechanical property of the iron-containing metastable beta titanium alloy can be guaranteed while formation of beta spots is inhibited or avoided, and a titanium alloy material with moderate strength and good plasticity is obtained.

Description

technical field [0001] The invention relates to the technical field of heat treatment of titanium and titanium alloys, in particular to a heat treatment method for an iron-containing metastable β-titanium alloy. Background technique [0002] Ti35421 (Ti-3Al-5Mo-4Cr-2Zr-1Fe) is a new type of low-cost high-strength titanium alloy, containing 1wt.% iron element, molybdenum equivalent value of about 13-14, aluminum equivalent value of about 4, is a Ferrous metastable beta titanium alloy. Like other types of titanium alloys, for iron-containing metastable β-titanium alloys, the main research focuses on how to improve the strength of titanium alloys and how to obtain high plasticity and high strength titanium alloys at the same time. [0003] At present, the commonly used treatment method is mainly solution aging heat treatment. Iron-containing metastable β titanium alloy has very good process plasticity and cold formability after solution treatment, and has good welding performa...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C14/00B22F3/24B22F10/64B33Y70/00
CPCC22F1/183C22C14/00B22F3/24B22F10/64B33Y70/00B22F2003/248Y02P10/25
Inventor 梁祖磊郑庆松常辉陈小龙李永华
Owner SHANGI INST FOR ADVANCED MATERIALSNANJING CO LTD
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