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.

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Section: Chapter Questions

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Concept explainers

Thermal Properties of Materials

In mechanical engineering, the thermal property is represented as the physical quantity that is relevant to the application of heat. The thermal properties are evaluated by variations in any specific material due to low heat or high heat. The quantities that influence the thermal property of the materials are mass, density, temperature, and many others.

Question

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) ofa
small specimen that has boen subjected to the following timo-demperature traatments. In
each case assume that the specimen begins at 845C (155OF), and that it has been held
at this temperature long enough to have achieved a complote and homogeneous
austenitic 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 hod
tor 10 s, then quench to room bemperature.
• Rapidly cool to 450C (840F), hold for 10 s, then quench to room temperature.
900
1600
800
A+F
1400
700
1200
AP
600
1000 E
500
A
800
50%
400
Mistart)
600
300
M190%)
200
400
100
200
0.1
10
10
10
10
Time
Temperature "F)

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