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PAGE#4 - ~(8.314J ImoIK(873k = ~.93x 10-17 m2 I S ~ At 1000°C 1010 Steel(0.1 wt%C is'Y-Fe(FCC and the diffusivity ofC in"-Fe at 1 OOO°c is

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Since the specimen dimensions are the same, we can compare the areas under the load-extension curves. The toughness ratio is NB -7. * 2. The worse case scenario is that the entire length of the defect acts as a stress concentrator, thus, a= 0.04 cm, K1c= 105 ksiJt;;, Y=l.l r=- K lC KlC = YO"'\11ra ,0" = ~ Y'\1 1ra -.Sl.-- ) or D o = D exp( -.Sl.-- ) RT RT 195 x 103J /mol '* 3. D = Do exp(-
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Unformatted text preview: ~ (8.314J ImoIK)(873k») = ~.93x 10-17 m2 I S ~ At 1000°C 1010 Steel (0.1 wt%C) is 'Y-Fe (FCC) and the diffusivity ofC in "'(-Fe at 1 OOO°c is: : 3xlO-7 cm2/s D600"C =(1.37x10-Sm2/s)exp(- 195x1 * 4. D = 0.21exp (-34000) (1.987*1273)-~~--,-(0.8 0.1) ~ We need to estimate the time required to produce a concentration of 0.4 wt % C at 2mm depth....
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This note was uploaded on 01/22/2012 for the course ME 2733 taught by Professor Meng during the Fall '10 term at LSU.

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