14 Tutorial Note - Chapter11

14 Tutorial Note - Chapter11 - 4340 4140 8640 and 5140...

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11.28a)
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Surface 3/4R Midradius Center 11.28a)
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11.28b)
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11.28b)
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50 55 45 40 35 50 mm Hardness HRC
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11.D6)
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11.D6)
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Surface Center Alloy Hardness (HRC) Hardness (HRC) 1040 40 24 5140 53 42 4340 57 55 4140 56 53 8640 55 48 Thus, alloys 4340, 4140, 8640, and 5140 will satisfy the criteria for both surface and center hardnesses.
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11.D7)
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11.D7a)
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Center Alloy Hardness (HRC) 8660 61 8640 49 8630 36 8620 25 Therefore, only 8660 and 8640 alloys will have a minimum of 45 HRC at the center, and therefore, throughout the entire cylinder.
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11.D7b)
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Center Alloy Hardness (HRC) 8660 59 8640 42 8630 30 8620 21 Therefore, only the 8660 alloy will have a minimum of 45 HRC at the center, and therefore, throughout the entire cylinder.
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11.D8)
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a) b) 11.D8)
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Center Alloy Hardness (HRC) 4340 55 4140 52 8640 47 5140 41 1040 23 Thus, only alloys 4340, 4140 and 8640 will qualify. a) b) Center Alloy Hardness (HRC) 4340 57 4140 55 8640 53 5140 48 1040 30 It is still necessary to have a hardness of 42 HRC or greater at the center; thus, alloys
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Unformatted text preview: 4340, 4140, 8640, and 5140 qualify. 11.D11) 11.D11) 11.D12) 0.2 wt% Be 2.7 wt% Be Hardening Range 11.D14) T1 T3 T2 T1 T3 T2 1.5 wt% Be 2 wt% Be 11.D14) Time range 204ºC Time range 204ºC 11.D15) Temperature ( ° C) Time Range (h) 260 not possible 204 0.3-15 149 10-700 121 300-? With regard to temperatures and times to give the desired ductility [Figure 11.25(b)]: Temperature ( ° C) Time Range (h) 260 <0.02, >10 204 <0.4, >350 149 <20 121 <1000 From these tabulations, the following may be concluded: It is not possible to heat treat this alloy at 260 ° C so as to produce the desired set of properties--there is no overlap of the two sets of time ranges. At 204 ° C, the heat treating time would need to be about 0.4 h, which is practical. At 149 ° C, the time range is between 10 and 20 h, which is a little on the long side. Finally, at 121 ° C, the time range is unpractically long (300 to 1000 h)....
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