PRACTICE SHEET: HEAT TREATMENT OF EUCTECTOID STEEL "C ROC 727 700 Course perlite 600 + Fine perlite 500 ta 400 300 W 200 -Me Mgo 100 I 1 day 10 10 10 101 Times Small, thin pieces of 0.25 mm thick hot rolled strips of 1080 steel are heated for 1 hour at 850C and then given the heat treatment shown in the following list. Using the TTT diagram given above, determine the microstructures of the samples after each heat treatment. (a) Water quench to room temperature (b) Hot quench to 610C, hold for 3 mins and then water quench to room temperature (c) Hot quench to 450C, hold for 1 hour and then water quench to room temperature (d) Hot quench to 300C, hold for 30 mins then water quench to room temperature (e) Hot quench to 300C, hold for 5 hours then water quench to room temperature