Q2: Determine the best quenching medium to produce a minimum hardness of HRC 40 at the center of a 3.75 cm diameter 4320 steel bar.
Q2: Determine the best quenching medium to produce a minimum hardness of HRC 40 at the center of a 3.75 cm diameter 4320 steel bar.
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
Related questions
Question
Q1: 1.5 in diameter steel part is quenched in oil with no agitation. (H=0.20). If we use a 4340; 4140; 8640; 5140; 1040 steel, what would be the hardness number at the center of the part?
Q2: Determine the best quenching medium to produce a minimum hardness of HRC 40 at the center of a 3.75 cm diameter 4320 steel bar.
Transcribed Image Text:Q1: 1.5 in diameter steel part is quenched in oil with no agitation. (H=0.20).
If we use a 4340; 4140; 8640; 5140; 1040 steel, what would be the hardness
number at the center of the part?
Q2: Determine the best quenching medium to produce a minimum hardness
of HRC 40 at the center of a 3.75 cm diameter 4320 steel bar.
Given
Cooling rate at 700°C (1300°F)
70C
490 305125 56 33 16.3 10 7 5.1
3.5 F
270170 70 31 18 9 5.6 3.9 2.8
2 "Os
100
60
4340
50
4340
80
50
50
40
4140
8640
8640
9310
1080
30
5140
30
1040
4320
20
1050
10
20
30
40
50 mm
20
I 1 1 14 1ị 2 in.
10
20
30
Distance from quenched end
Jominy distance (th of an inch)
6.5
6.0
-0.0
TABLE I The H coefficient, or severity of the quench, for several
quenching media
55
5.0
Cooling Rate at the Center
of a 1-in. Bar ("C/s)
0.50
4.5
Medium
H Coefficient
0.35
4.0
18
Oil (no agitation)
Oil (agitation)
H20 (no agitation)
H20 (agitation)
Brine (no agitation)
Brine (agitation)
0.25
3.5
0.20
1.0
45
3.0
1.0
45
2.5
4.0
190
2.0
2.0
90
Round
bors
5.0
230
1.
DISTANCE FROM QUENCHED END (IN.)
DIAMETER (IN.)
Hardness, HRC
H-FACTOR
Percent martensite
Rockwell C hardness
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