The structure of martensite is generated in this way by a deformation that has important consequences on the properties of the material. Diffusionless transformations can therefore be categorised into those dominated by the shuffling of atoms and others in which the larger proportion of atoms is displaced into their final locations by the homogeneous deformation of the parent lattice. The rate required to achieve martensitic transformation depends strictly on the kinetics of the reactions that precede martensite. The largest interface plane between the austenite and martensite is designated the “habit plane”. It is important to note that the crystallographic theory places a firm mathematical connection between the habit plane, orientation relationship and shape deformation, characteristics that are not independent. The strength of austenite decreases with temperature so it becomes prone to relax by plastic deformation when subjected to the shape deformation during transformation.