(a) Explain the three stages of the annealing of metallic materials by drawing the figure. (b) Treating grain growth as the third stage of annealing, explain its effect on the strength of metallic materials. (c) The following data were obtained when a cold-worked metal was annealed. Estimate the recovery, recrystallization, and grain growth temperatures;

\begin{tabular}{lccl} \hline AnnealingTemperature(C) & ElectricalConductivity(ohm1cm1) & YieldStrength(MPa) & GrainSize(mm) \\ \hline 400 & 3.04105 & 86 & 0.10 \\ 500 & 3.05105 & 85 & 0.10 \\ 600 & 3.36105 & 84 & 0.10 \\ 700 & 3.45105 & 83 & 0.098 \\ 800 & 3.46105 & 52 & 0.030 \\ 900 & 3.46105 & 47 & 0.031 \\ 1000 & 3.47105 & 44 & 0.070 \\ 1100 & 3.47105 & 42 & 0.120 \\ \hline \hline \end{tabular}