申論題

1.(20%) The simplified Fe-C phase diagram is shown below for the following questions. A carbon-steel alloy containing 1.5wt% C is cooled down slowly from T₁to T₅.

(1) Draw the a₀-T plot (lattice constant vs. tempcrature) for the γphase between T₁ and T₄, assuming that the thermal expansion coefficient of γis 0/℃. (5%)