A 44-mm diameter cylindrical steel specimen is to be heat treated such that the microstructure throuwill be at least 50% martensite. We are to decide which of several alloys will satisfy this criterion if the quenmedium is moderately agitated (a) oil, and (b) water.Cooling rate at 700°C (1300*F)Cooling rate at 700°C (1300°F)7 "Fis3.9 °Cs305 125 56 3316.310305 125 56 3316.3107 "F/s9 5.6170 70 31 18170 70 31 1895.63.9 "Cs100100Surface7575SurfaceCenter50CenterCenter25RSurface1030 mm102030 mm1j in.11 in.Equivalent distance from quenched endEquivalent distance from quenched endwater quenchingoil quenchingCooling rate at 700°C (1300°F)490 305 125 56 3316.3105.13.5 °F/s270170 70 31 18602.82 °C/s95.63.9-1005043408040414086403051401040201020304050 mm1 1 12 in.4.Distance from quenched endHardness, HRCDiameter of bar (mm)20m14Diameter of bar (in.)Diameter of bar (mm)1/2m/4Percent martensiteDiameter of bar (in.)

Diameter of specimen = 44 mm To obtain 50% martensite, a) For oil, From oil quenching graph ,…

Answered: will be at least 50% martensite. We are…

will be at least 50% martensite. We are to decide which of several alloys will satisfy this criterion if the quen medium is moderately agitated (a) oil, and (b) water.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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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

A 44-mm diameter cylindrical steel specimen is to be heat treated such that the microstructure throu
will be at least 50% martensite. We are to decide which of several alloys will satisfy this criterion if the quen
medium is moderately agitated (a) oil, and (b) water.
Cooling rate at 700°C (1300*F)
Cooling rate at 700°C (1300°F)
7 "Fis
3.9 °Cs
305 125 56 33
16.3
10
305 125 56 33
16.3
10
7 "F/s
9 5.6
170 70 31 18
170 70 31 18
9
5.6
3.9 "Cs
100
100
Surface
75
75
Surface
Center
50
Center
Center
25
R
Surface
10
30 mm
10
20
30 mm
1j in.
1
1 in.
Equivalent distance from quenched end
Equivalent distance from quenched end
water quenching
oil quenching
Cooling rate at 700°C (1300°F)
490 305 125 56 33
16.3
10
5.1
3.5 °F/s
270170 70 31 18
60
2.8
2 °C/s
9
5.6
3.9
-100
50
4340
80
40
4140
8640
30
5140
1040
20
10
20
30
40
50 mm
1 1 1
2 in.
4.
Distance from quenched end
Hardness, HRC
Diameter of bar (mm)
20
m14
Diameter of bar (in.)
Diameter of bar (mm)
1/2
m/4
Percent martensite
Diameter of bar (in.)

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