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What details should be noted in the selection and testing of titanium castings?

Titanium castings, as important components in the mechanical field, have been widely used. Compared with traditional metal castings, titanium castings have advantages such as light weight, strength, and corrosion resistance, making them important applications in aviation, aerospace, automotive, medical and other fields. However, when using titanium castings, material selection and testing are very important aspects, and the following will elaborate on these two aspects in detail.

1、 Material selection of titanium castings

1. Selection of types of titanium alloys

When selecting titanium casting materials, it is necessary to choose different titanium alloys according to the actual application environment. There are currently many types of titanium alloys, such as α+β Type β Type α Type and other types. Among them, commonly used ones are TA2, TA6V, TC4, Ti-6242, etc.

TA2 titanium alloy is a commonly used titanium alloy, which has the characteristics of good processability, weldability, high plasticity, good low-temperature, micro corrosion, and heat resistance to steam.

TA6V alloy is a typical α+β Titanium alloy, with high strength, corrosion resistance, and fatigue performance, is widely used in the aviation and aerospace fields.

TC4 alloy is α+β A type of titanium alloy with relatively uniform composition, which has high mechanical properties and good corrosion resistance.

Ti-6242 alloy is β Titanium alloy, with high strength, high plasticity, and good thermal expansion performance, is widely used in the field of aviation manufacturing.

2. Purity requirements for titanium alloys

Titanium alloy is composed of titanium and other metallic elements. The purity requirement has a significant impact on the mechanical, physical, and process properties of titanium alloys, typically requiring a total impurity content of less than 0.1%.

3. The impact of other product requirements

When selecting titanium casting materials, consideration should also be given to the impact of other product requirements on the materials. Factors such as the performance and usage requirements of the product, the current production process status and development trends will all have an impact on the selection of materials.

2、 Testing of titanium castings

1. Appearance inspection of titanium castings

When producing titanium castings, the first step is to conduct visual inspection to identify corresponding defects. Appearance inspection requires visual observation first, followed by microscopic inspection using a magnifying glass or microscope to determine the inspection data of titanium castings.

2. X-ray testing

X-ray testing is a non-contact detection method that can be used to detect internal defects in titanium castings. By entering the interior of titanium castings through X-rays and recording their absorption of X-rays, internal defects in titanium castings can be discovered.

3. Ultrasonic testing

Ultrasonic testing is also a non-contact detection method suitable for detecting surface defects and internal defects. Ultrasonic testing requires the use of specialized ultrasonic probes to detect material defects using the energy of sound waves.

4. Magnetic particle testing

Magnetic particle testing is an important method for detecting surface defects in titanium castings. It uses magnetic particle particles as a medium and sprays them onto the surface of the titanium casting. Through the action of a magnetic field, the magnetic particle particles are gathered on the surface of the titanium casting to discover surface defects.

5. Coating testing

Coating inspection is the detection of defects such as coating adhesion, surface morphology, and texture. Coating detection usually uses detection methods such as optical microscopy and scanning electron microscopy.

6. Routine physical performance testing

Conventional physical performance testing is aimed at testing the mechanical, chemical, and thermodynamic properties of titanium castings. Common conventional physical performance tests include tensile testing, impact testing, hardness testing, chemical testing, etc.

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