NONEQUIL TRANSFORMATION PRODUCTS FeC Bainite a lathes strips

NON-EQUIL TRANSFORMATION PRODUCTS: Fe-C • Bainite: --a lathes (strips) with long rods of Fe 3 C --diffusion controlled. • Isothermal Transf. Diagram (Adapted from Fig. 10. 8, Callister, 6 e. (Fig. 10. 8 from Metals Handbook, 8 th ed. , Vol. 8, Metallography, Structures, and Phase Diagrams, American Society for Metals, Materials Park, OH, 1973. ) Adapted from Fig. 10. 9, Callister 6 e. (Fig. 10. 9 adapted from H. Boyer (Ed. ) Atlas of Isothermal Transformation and Cooling Transformation Diagrams, American Society for Metals, 1997, p. 28. ) Chapter 10 - 9

OTHER PRODUCTS: Fe-C SYSTEM (1) • Spheroidite: --a crystals with spherical Fe 3 C --diffusion dependent. --heat bainite or pearlite for long times --reduces interfacial area (driving force) • Isothermal Transf. Diagram Phase boundaries are a form of defects (Adapted from Fig. 10, Callister, 6 e. (Fig. 10 copyright United States Steel Corporation, 1971. ) Adapted from Fig. 10. 9, Callister 6 e. (Fig. 10. 9 adapted from H. Boyer (Ed. ) Atlas of Isothermal Transformation and Cooling Transformation Diagrams, American Society for Metals, 1997, p. 28. ) Chapter 10 - 10

OTHER PRODUCTS: Fe-C SYSTEM (2) • Martensite: Body-centered tetragonal --g(FCC) to Martensite (BCT) (Adapted from Fig. 10. 11, Callister, 6 e. • Isothermal Transf. Diagram (Adapted from Fig. 10. 12, Callister, 6 e. (Fig. 10. 12 courtesy United States Steel Corporation. ) Adapted from Fig. 10. 13, Callister 6 e. • g to M transformation. . -- is rapid! -- % transf. depends on T only (I. e. does not depend on time. In other words, it is diffusionless. . Chapter 10 - 11

COOLING EX: Fe-C SYSTEM (1) Adapted from Fig. 10. 15, Callister 6 e. Chapter 10 - 12

COOLING EX: Fe-C SYSTEM (2) Adapted from Fig. 10. 15, Callister 6 e. Chapter 10 - 13

COOLING EX: Fe-C SYSTEM (3) Adapted from Fig. 10. 15, Callister 6 e. Chapter 10 - 14

Effect of alloying on the Isothermal Transformation Diagram Chapter 10 -