quiz7spr01 - ~ Quiz 7 ENSC 3313, Spring 2001 Answer any 4...

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~~ ENSC 3313, Spring 2001 Quiz 7 Name Answer any 4 Questions only. 1 point each I have marked out the results of processing sequences a), b), and c). Tell what I have marked out; add explanatory comments. 800 i I. I I I I I ~ ~e:~!~~-.J 1400 LJ a) Quenched from y, passed the nose and held in the bainite region beyond the necessary time to complete the transformation to bainite -hence have 100% bainite. 700 ... ~1200 (01 p 600~ jl000 i:~ B b) Quenched from y, avoiding the nose through the martensite range -hence 1 00% martensite. "- 800~ 8. E ~ 600 (0) c ) 50% fine l2earlite then Quenched to bainite region and held -hence the remaining ~ is bainite. 300 '.- 400 200 100 200 10-1 .10 102 103 Time (s) FIGURE 10.16 Isothennal transformation diagram for an iron-carbon alloy eutectoid compositioo and the isothermal heat treatments (a). (b). and (c) Explain how we could obtain at room temperature, by cooling from austenite, a microstructure of a 0.8% C steel that is a) 100% spheroidite, b) 100% ~
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quiz7spr01 - ~ Quiz 7 ENSC 3313, Spring 2001 Answer any 4...

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