MAE 20 Homework_4_SOLUTIONS_summer_2008

MAE 20 Homework_4_SOLUTIONS_summer_2008 - MAE 20 Homework 4...

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MAE 20 July 30, 2008 Homework 4 1. (Note: A 1010 steel has 0.15 wt% C, 10130 steel has 1.3 wt% C etc. ) % 9 . 96 pearlite % 1 . 3 100 0.0218 6.67 0.77 - 0.95 α Primary .2% 14 C Fe 85.8% 100 0 6.67 0.95 6.67 α steel 1095 (b) 10.5% pearlite 89.5% 100 0.0218 0.77 0.10 - 0.77 α Primary 2.5% C Fe 98.5% 100 0 6.67 0.10 6.67 α steel (a)1010 3 3 2. (From Figure 13-7 in the text) (a) Austenite is present after heating to 820 o C; both ferrite and pearlite form during holding at 650 o C; ferrite and pearlite remain after cooling to 25 o C (b) Austenite is present after heating to 820 o C; bainite forms after holding at 450 o C; and bainite remains after cooling (c) Austenite is present after heating to 820 o C; martensite forms due to the quench (d)Austenite is present after heating to 820 o C; ferrite forms at 720 o C, but some austenite still remains. During quenching, the remaining austenite forms martensite; the final structure is ferrite and martensite. (e) Austenite is present after heating to 820 o C; ferrite begins to form at 720 o C, but austenite still remains. At 400
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MAE 20 Homework_4_SOLUTIONS_summer_2008 - MAE 20 Homework 4...

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