Bainite's a phase that exists in steel microstructures after certain heat treatments. First described by Davenport E. S. and Edgar Bain, it's one of the decomposition products that may form when austenite (the face centered cubic crystal structure of iron)'s cooled past a critical temperature of 723 °C (about 1333 °F). Davenport and Bain originally described the microstructure as being similar in appearance to tempered martensite. A fine non-lamellar structure, bainite commonly consis… (More on Bainite)