What should be noted for surface heat treatment during the processing of titanium alloy accessories?

August 10, 2024

Surface heat treatment is a key process in the processing of titanium alloy parts, which is of great significance for improving the performance and extending the service life of the parts. When conducting surface heat treatment, the following aspects should be noted:

1. Choose an appropriate heat treatment method

There are various heat treatment methods for titanium alloys, including annealing, solution treatment, quenching, and tempering. Each method has its specific application scenarios and effects. When choosing a heat treatment method, comprehensive consideration should be given to the material, performance requirements, and processing conditions of the titanium alloy.

2. Strictly control the heat treatment parameters

Heating temperature and time

Heating temperature is one of the key parameters in the heat treatment process, which needs to be determined according to the type and performance requirements of titanium alloy. Excessive heating temperature may lead to grain growth and coarsening of the structure, affecting the mechanical properties of the material; However, excessively low heating temperatures may not achieve the expected heat treatment effect.

The heating time also needs to be strictly controlled to ensure that the alloy elements can be fully dissolved into the matrix, while avoiding problems such as oxidation and decarburization caused by prolonged heating.

Cooling rate

Titanium alloys have poor hardenability, high thermal stress during quenching, and parts are prone to warping. Therefore, it is necessary to strictly control the cooling rate during the quenching process to avoid adverse effects on material properties caused by too fast or too slow cooling rates.

3. Choosing to protect the atmosphere

Titanium alloys are prone to react with gases such as oxygen and hydrogen at high temperatures, leading to problems such as oxidation, hydrogen absorption, and even hydrogen embrittlement. Therefore, it is necessary to choose a suitable protective atmosphere during the heat treatment process.

Vacuum heat treatment is an effective protective measure that can avoid direct contact between titanium alloys and gases such as oxygen and hydrogen. During the vacuum heat treatment process, it is necessary to control the vacuum working pressure to avoid surface corrosion caused by low vacuum pressure.

In addition to vacuum heat treatment, inert gases such as high-purity argon can also be used as a protective atmosphere. When selecting inert gases, attention should be paid to their purity and dew point requirements to ensure protective effects.

4. Control of surface quality and dimensional accuracy

Titanium alloy fittings are prone to cracking, deformation, and other issues during heat treatment, which can affect surface quality and dimensional accuracy. Therefore, the following measures need to be taken during the heat treatment process:

Optimize heat treatment process to reduce stress concentration and deformation.

Conduct necessary inspections and measurements before and after heat treatment to ensure that the surface quality and dimensional accuracy of the accessories meet the requirements.

5. Equipment maintenance and management

Heat treatment equipment is an important tool in the processing of titanium alloy parts, and its operating status directly affects the heat treatment effect. Therefore, it is necessary to regularly maintain the equipment, replace worn parts in a timely manner, and clean up accumulated dust; At the same time, it is necessary to strengthen the management of equipment, formulate detailed operating procedures and safety management systems, and prevent accidents caused by improper operation.

Author:

Mr. yurun

E-mail:

sales@yurunhwfty.com

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13790332888