$10$B$.2(24$ points$)$

Briefly describe the simplest heat treatment procedure that would be used in converting a $0\mathrm{.}76$ wt $\backslash (\backslash \%\backslash$mathrm$\{$C$\}\backslash )$ steel from one microstructure to the other, as follows: $(4$ pts each$)$

a$)$ Martensite to pearlite

b$)$ Spheroidite to tempered martensite

c$)$ Fine pearlite to bainite

d$)$ Pearlite to Spheroidite

e$)$ In bullet format compare and contrast the expected mechanical behavior of the final microstructures developed in a$,$ b$,$ c$,$ and d above in terms of: $(8$ pts $)$

i$.$ Yield strength

ii$.$ Ductility