Peritectoid reaction
Peritectoid is a solid-state transformation where two solid phases react to form a new phase. This occurs in a defined temperature range and leads to special metal structures.
Physical-Chemical Mechanism of Action
Peritectoid is a transformation in which two solid phases react at specific temperatures and combine to form a new phase. This process occurs without the intervention of a liquid melt.
Metallurgical Relevance & Risks in Welding
Peritectoid can occur in certain steels during cooling and leads to specific metal structures. These structures can influence mechanical properties, such as hardness and toughness. Incorrect cooling rates can cause undesirable peritectoid formation, leading to negative changes in properties.
Workshop Practice & Action Guidelines
To control peritectoid formation, the cooling rates must be precisely controlled. This involves holding the weld in a defined temperature range for a specific time. The exact temperatures and times vary depending on the steel type and material composition.