Solution5

Solution5 - casting area; no heat loss across this...

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HW 5 Solution 9-3 8 3 2 7 * 10 128 . 10 ) 420 )( / 1737 ( ) 273 1538 )( / 10 204 )( 2 ( × = + × = cm J cm J r cm 3 24 3 8 10 4352 ) 10 128 . 10 ( 3 4 cm V × = × = π 3 ) 92 . 2 ( ° = A V UC =24.897Å 3 =24.897×10 -24 cm 3 Number of unit cells 4352/24.897 = 175 Atoms per nucleus = (175 cells)(2 atoms/cell)=350 atoms 9-12
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9-20 (a)T pour = 900 Cº (b) T sol = 420C º (c) ΔT s =900-420=480Cº (d) ΔT/Δt= 312 0 6 . 1 400 900 = Cº/min (e) t s =9.7 min (f) LST=9.7-1.6 min=8.1 min (g) 420-360 = 60Cº (h) Zn (i) t s =9.7=B[8/24] 2 B=87.5min/in 9-27 73 . 0 ) 4 )( 2 ( 1 ) 4 )( 4 ( 5 ) 4 )( 4 )( 4 ( ) / ( = + = thick A V 50 . 0 ) 2 )( 2 ( 2 ) 4 )( 2 ( 3 ) 4 )( 2 )( 2 ( ) / ( = + = thin A V 80 . 0 4 ) 4 / ( 2 ) 8 )( 4 ( ) 8 )( 4 )( 4 / ( ) / ( 2 2 = + = π Riser A V The area between the thick and thin sections of the casting are not included in calculating
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Unformatted text preview: casting area; no heat loss across this interface. The riser will not be effective; the thin section has the smallest V/A ration and therefore freezes first. Even though the riser has the longest solidification time, the thin section isolates the thick section from the riser, preventing liquid metal from feeding from the riser to the thick section. The shrinkage will occur in the thick section....
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Solution5 - casting area; no heat loss across this...

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