explaination too, please

1. Suppose a shaft made from AISI 1018 steel was liquid carburized at a temperature of 1700F to form a 0.100 inch case (surface layer) containing 1.2% carbon. The shaft was then cooled slowly to room temperature. Sketch the microstructure and label the phases or constituents that you would expect to be present in (A) the surface case and (B) the inner core of the sample. Explain briefly. 2. Suppose a 1/2 inch diameter sample made from AISI 4140 steel was carburized, forming a case (surface layer) 0.080 inch thick containing 1.1% carbon. The component is then quenched in water from a temperature of 1650F. \$ketch the microstructure and label the phases that you would expect to be present in (C) the surface case and (D) the inner core of the sample. Explain briefly