a) 1030 steel is given an improper quench and temper heat treatment, producing a final structure composed of 60% martensite and 40% ferrite. Estimate the carbon content of the martensite and the austenitizing temperature that was used. How would you redesign the process?
b) A steel contains 18% cementite and 82% ferrite at room temperature. Estimate the carbon content of the steel. Is the steel hypoeutectoid or hypereutectoid?
c) Calculate the amounts of ferrite, cementite, primary microconstituent, and pearlite in the following steels: (i) 1015, (ii) 1035, (iii) 1095, and (iv) 10130.