What are the effects of cold and hot shock on materials

Date：2023-08-15 15:41:00Views：272

Cold and hot impact testing is to verify the degree to which a product can withstand continuous environments of extreme high and low temperatures in an instant, in order to test its chemical changes or physical injuries caused by thermal expansion and contraction in the shortest possible time. Applicable objects include metals, plastics, rubber, electronics Such materials can serve as a basis or reference for product improvement. This article will introduce the impact of cold and hot shock on materials.

Mainly including the following aspects:

1. Mechanical properties: Cold and hot impact tests may cause changes in the mechanical properties of materials, such as tensile strength, bending strength, impact strength, etc. This is because the material undergoes thermal expansion and contraction at different temperatures, leading to changes in the stress distribution inside the material.

2. Dimensional stability: Cold and hot impact tests may cause changes in the dimensional stability of the material, such as dimensional expansion, shrinkage, or deformation. This is because the material undergoes thermal expansion and contraction at different temperatures, resulting in changes in the size of the material.

3. Chemical properties: Cold and hot impact tests may cause changes in the chemical properties of the material, such as corrosion resistance, wear resistance, oxidation resistance, etc. This is because materials undergo chemical reactions at different temperatures, leading to changes in their chemical properties.

4. Microstructure: Cold and hot impact tests may cause changes in the microstructure of the material, such as grain size, phase transformation, dislocation density, etc. This is because the material undergoes microstructure changes such as phase transition or dislocation movement at different temperatures.

In the cold and hot impact test, the most crucial thing is to establish the stress caused by inconsistent thermal expansion and contraction of different materials. The actual thermal shock is most likely to occur outside the tested product, and relevant information indicates that it is not necessary to achieve temperature stability throughout the product, as long as the temperature of the tested product is consistent with the test temperature. Although this opinion is reasonable, it is also difficult to implement because it is impossible to install many sensors on the surface of the product. In addition, the heat transfer capacity of each part of the product is inconsistent, and the heat capacity of adjacent components inside the tested product is also inconsistent, making it difficult to determine.

The changes in the above aspects may lead to changes in the performance and stability of the material, thereby affecting its reliability and service life. Therefore, hot and cold impact testing is an important material performance testing method that can help manufacturers evaluate the durability and stability of materials to ensure product quality and reliability.