Summary of materials used in pressure vessels

Date:

2023-05-05

1. Crystal


Atoms are arranged periodically and regularly in a certain way in three-dimensional space, with fixed melting points and anisotropy.


2. Mesophase


When two components A and B form an alloy, in addition to forming A or B based solid solution, it is possible to form A new phase whose crystal structure is different from that of A and B. Since their positions on the binary phase diagram are always in the middle, these are usually referred to as intermediate phases.


3. Metastable phase


Metastable phase refers to a phase that is not thermodynamically stable, but in the process of rapid cooling to heating, it fails to transform into a stable phase due to the thermodynamic energy barrier or dynamics factors and temporarily stable.


4. Coordination number


The number of atoms close to and equidistant from any atom in a crystal structure.


5. Recrystallization


After the cold deformation of the metal is heated to a certain temperature, the new grain without distortion is generated in the original deformation of the structure, and the property has also been significantly changed and returned to the state before deformation, this process is called recrystallization. (indicates the process in which the new equiaxed grains without distortion gradually replace the deformed ones).


6. Pseudo-eutectic


Under the condition of non-equilibrium solidification, all eutectic structures can be obtained from some subeutectic or hypereutectic alloys. This eutectic structure obtained from non-eutectic alloys is called pseudo-eutectic.


7. Cross slip


When a screw dislocation is blocked on the original slip plane, it may be transferred from the original slip plane to the other slip plane intersecting with it to continue sliding. This process is called cross-slip.

Crystal

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2023-05-05

Summary of materials used in pressure vessels

When two components A and B form an alloy, in addition to forming A or B based solid solution, it is possible to form A new phase whose crystal structure is different from that of A and B. Since their positions on the binary phase diagram are always in the middle, these are usually referred to as intermediate phases.

2023-05-05

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