Recommend appropriate isothermal heat treatments to obtain the following, including appropriate temperatures and times:
(a). An isothermally annealed 1050 steel with HRC 23;
(b). An isothermally annealed 10110 steel with HRC 40;
(c). An isothermally annealed 1080 steel with HRC 38;
(d). An austempered 1050 steel with HRC 40;
(e). An austempered 10110 steel with HRC 55; and
(f). An austempered 1080 steel with HRC 50.