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
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Author:Sadiku, Matthew N. O.
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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.)
Transcribed Image Text: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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