Lsing the isothemal transtomation diagram for a 0.45 wes C stoel alloy (Fqure 10.40).dotemine the final microstructure in terms of just the microconstituents present) ofasmall specimen that has boen subjected to the following timo-demperature traatments. Ineach case assume that the specimen begins at 845C (155OF), and that it has been heldat this temperature long enough to have achieved a complote and homogeneousaustenitic structure.• Rapidly cool to 250C (480F), hold for 10s, then quench to room temperature.• Rapidly cool to 70OC (1290F), hold for 30s, then quench to room temperature• Rapidly cool to 400C (750F), hold tor 500s, then quench to room temperature.• Rapidly cod to6C(12DFI, hadat this temparature br 35, rapidly cod to 4000 (7OFI hodtor 10 s, then quench to room bemperature.• Rapidly cool to 450C (840F), hold for 10 s, then quench to room temperature.9001600800A+F14007001200AP6001000 E500A80050%400Mistart)600300M190%)2004001002000.110101010TimeTemperature "F)

Given-Data:- 0.45% wt steel alloy Begins at 845C To-Find:- a) When rapidly cooling to 2500C and…

Daing the isohemal transtomation dagram for a0.45 wts Cstoei aloy ae 10.40 dotomine he finai microstructure in tems of just the microconstitents present) ofa small specimen that has been subjected to e tollowing Emetemperature treatments. In each case assume hat he specimen begins at 4SC (15SOF and that it has been heid at is temperature long enough to have achieved a compiete and homogeneous austenite structure. • Rapidy cool to 25OC (4ROFL hold for 10 s, hen quench to room temperature. • Rapidy cool to 70oc (12OFL hold for 30 s, hen quench to room temperature Rapidy cool to 400c (7SOFL hald tor s00 s, hen quench to room temperature. • Rapidy cod toC(IzO hadat s tempate br3s, pidy cod to4CD ha tor 10s. hen quench to room temperature. • Rapidy cool to 45oC 4OFL hold for 10 s, hen quench to room temperature. 900 1600 1400 700 1200 A.P 1000 s00 400 so% Mstart 600 300 MSOu MSONI 200 400 100 200 10 Time 10 10 10

Daing the isohemal transtomation dagram for a0.45 wts Cstoei aloy ae 10.40 dotomine he finai microstructure in tems of just the microconstitents present) ofa small specimen that has been subjected to e tollowing Emetemperature treatments. In each case assume hat he specimen begins at 4SC (15SOF and that it has been heid at is temperature long enough to have achieved a compiete and homogeneous austenite structure. • Rapidy cool to 25OC (4ROFL hold for 10 s, hen quench to room temperature. • Rapidy cool to 70oc (12OFL hold for 30 s, hen quench to room temperature Rapidy cool to 400c (7SOFL hald tor s00 s, hen quench to room temperature. • Rapidy cod toC(IzO hadat s tempate br3s, pidy cod to4CD ha tor 10s. hen quench to room temperature. • Rapidy cool to 45oC 4OFL hold for 10 s, hen quench to room temperature. 900 1600 1400 700 1200 A.P 1000 s00 400 so% Mstart 600 300 MSOu MSONI 200 400 100 200 10 Time 10 10 10

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Using the isothermal transformation diagram for a 0.45 wt% C steel alloy (Animated Figure 10.40), determine the approximate percentages of the microconstituents that form the final microstructure of a small specimen that has been subjected to the following time– temperature treatments. In each case assume that the specimen begins at 845°C (1550°F), and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure.
Consider an AISI 1045 ferrite and pearlite microstructure. The sample is initially heated to 845 deg C and quenched in water. The samples are then tempered for 20 minutes at 316 deg c, 425 deg c, and 600 deg c. Can yu tell me what would happen to the microstructure hardness os the samples as a result of quenching, tempering theory wise.
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