Martensitic Finish Temperature
The martensite finish temperature is the point at which martensite transformation completes on cooling, and the structure reaches its maximum transformation degree. For highly alloyed materials, this value can be below room temperature.
Physicochemical Mechanism of Action
The martensite finish temperature is the thermal point at which the martensite transformation is complete on cooling. In this state the metal has reached its maximum degree of transformation and shows a glass-hard structure.
Metallurgical Relevance & Welding Risks
If the martensite finish temperature is too low (below room temperature), the structure can stay glass-hard at normal ambient temperature and be prone to cracking. This raises the susceptibility to cracks and reduces the toughness of the material.
Workshop Practice & Instructions
To make sure the structure transforms correctly, the cooling sequence must be followed. With high-alloy materials it is important that the martensite finish temperature does not drop below room temperature. This can be achieved through controlled cooling, e.g. with cooling water or cooling gas.