Phase Equilibria & Metallurgical Processes

The phase equilibria will be introduced in this chapter and the role of phase equilibria in the metallurgical processes and material science will be learned. The chapter introduces the idea of phase diagrams as graphical illustrations of the stability of the different phases at different temperatures and composition, however, it talks about the iron-carbon (Fe-C) diagram and the water (H₂O) diagram in particular. The lever rule has been defined as a quantitative method of determining the phases of a two phase system in relation to each other. The design and fabrication of alloys, metals and ceramics require knowledge of phase behavior to offer the preferred mechanical, thermal, and chemical characteristics to the material. The chapter also has industrial applications that consist of steel production, alloy formulation, casting and ceramic production where phase diagrams are applied in controlled cooling, solidification and in heat treatment. In addition, the chapter shows the impact of impurities on the material performance and reliability, cooling rate and phase change. With the theory and the real life process experience, the student actually learns how to use phase equilibria to make material decisions, process decisions and quality decisions in the area of metallurgy and materials engineering. The information forms a foundation in the advanced materials production and industry chemical processes.