1. The phase transition point of metal in vacuum state. In a vacuum that is only 0.1MPa different from the atmospheric pressure, the solid-state phase transition thermodynamics and kinetics do not change.
When formulating the vacuum heat treatment process regulations, it can be completely based on the principle of solid-state phase change under normal pressure.
2. Vacuum degassing improves the physical and mechanical properties of metal materials.
3. Vacuum degreasing effect.
4. Evaporation of metal: When heated in a vacuum state, elements on the surface of the workpiece will evaporate.
5. Surface purification effect, achieving less oxidation and less decarburization heating.
6. The degree of vacuum required for metal to achieve non-oxidation heating.
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