Q3: With a moderately agitated water, a cylindrical piece of steel with 80 mm diameter is to be quenched. The hardnesses of the surface and center must be at least 55 and 40 HRC, respectively. Which of these alloys will satisfy the following requirements: 1040, 5140, 4340, 4140, 8620, 8630, 8640, and 8660? Cooling rate at 700C Cooling rate at 700c 170 70 31 18 9 5.6 270170 70 31 18 9 60 3.9 C 5.6 3.9 28 100 100 50 4340 Surface 40 4140 50 Center 8640 30 5140 1040 20 10 20 30 40 50 mm 10 20 30 mm Distance from quenched end Equivalent distance from quenched end Figure 3 Figure 4 Hardness, HRC Percent martensite Diameter of bar lmm) 75

Q3: With a moderately agitated water, a cylindrical piece of steel with 80 mm diameter is to be quenched. The hardnesses of the surface and center must be at least 55 and 40 HRC, respectively. Which of these alloys will satisfy the following requirements: 1040, 5140, 4340, 4140, 8620, 8630, 8640, and 8660? Cooling rate at 700C Cooling rate at 700c 170 70 31 18 9 5.6 270170 70 31 18 9 60 3.9 C 5.6 3.9 28 100 100 50 4340 Surface 40 4140 50 Center 8640 30 5140 1040 20 10 20 30 40 50 mm 10 20 30 mm Distance from quenched end Equivalent distance from quenched end Figure 3 Figure 4 Hardness, HRC Percent martensite Diameter of bar lmm) 75

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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Question

Q3: With a moderately agitated water, a cylindrical piece of steel with 80 mm diameter is to be quenched. The
hardnesses of the surface and center must be at least 55 and 40 HRC, respectively. Which of these alloys will
satisfy the following requirements: 1040, 5140, 4340, 4140, 8620, 8630, 8640, and 8660?
Cooling rate at 700c
Cooling rate at 700°c
170 70 31 18
5.6
3.9 "C
270 170 70 31 18 9
60
2 "Os
5.6
3.9
2.8
100
100
50
4340
80
75
3
Surface
40
4140
Center
8640
30
5140
25
1040
20
10
20
30
40
50 mm
10
20
30 mm
Distance from quenched end
Equivalent distance from quenched end
Figure 3
Figure 4
Hardness, HRC
Percent martensite
Diameter of bar (mm)

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