Martensitic Transformation: Characteristics and Influences

This lecture discusses the martensitic transformation in metals, focusing on the differences between diffusional and martensitic phase transformations. It outlines the characteristics of martensitic transformations, including the movement of atoms and the conditions under which these transformations occur. The instructor explains the significance of temperature and time in determining the extent of transformation, emphasizing that martensitic transformations can happen at very low temperatures. The lecture also covers the role of carbon atoms during the transformation, highlighting how they affect the structure and hardness of martensite. Additionally, the influence of alloying elements on the stability of different phases is examined, detailing how certain elements can promote or hinder the formation of martensite. The discussion includes diagrams and examples to illustrate the concepts, making it clear how the martensitic transformation is crucial in materials science and engineering applications.