Titanium Martensitic Transformation Kinetics
Titanium martensitic transformation kinetics describes how the high-temperature beta phase in titanium alloys rapidly transforms to a martensitic structure. This happens without diffusion and by rapid cooling.
Physical-chemical mechanism of action
Titanium alloys consist of a high-temperature beta phase structure that transforms into a martensitic structure upon rapid cooling. This process is diffusionless and occurs through shear movement of the crystal lattice.
Metallurgical relevance & risks when welding
The kinetics of titanium martensite transformation affect the mechanical properties of the weld. Too rapid cooling can lead to a glass-hard martensitic structure, increasing hardness and reducing formability. This can cause cracks and fractures in the material.
Workshop practice & instructions
To achieve an optimal weld, it is important to cool the titanium alloy weld metal slowly. A recommended cooling time of 10 to 20 seconds after welding can help control the martensitic structure and achieve a balanced hardness and formability.