Many Sliding And Rotating Parts Such As Cams And Gears Call For A Hard Structure In The Surface Layers Backed By A Tou 1 (90.49 KiB) Viewed 10 times
Many Sliding And Rotating Parts Such As Cams And Gears Call For A Hard Structure In The Surface Layers Backed By A Tou 2 (75.15 KiB) Viewed 10 times
Many sliding and rotating parts, such as cams and gears, call for a hard structure in the surface layers backed by a tough structure in the interior. The first step in producing such parts is to diffuse carbon into the surface of a steel, raising the level from the original level of about C-0.2% carbon to 0.5-0.9% carbon for 0,005-0.050 in. (0.0127-0.127 cm). If the part is placed in a furnace at 1000°C with an atmosphere rich in hydrocarbon gas, the surface reaches a carbon content of about C =0.9% very rapidly. The carbon content beneath the surface then rises gradually as a function of time. Calculate the carbon content C=C, at x=0.010 in. (0.0254 cm) beneath the surface after t=10 h (36,000 sec) at T=1000°C. a) Write the relation for non steady state diffusion in terms of the concentrations and an error function. D) Determine D-D. candler ) for the turnace temperature assuming (watch your units): RT for diffusing into y-Fe (ie, Fe is FCC (Y) at T>911C) D.-2.3x10 m/s and Q. = 148,000 J/mol where R=universal gas constant (8.31 J/mol-K) and T= absolute temperature (K) c) Calculate the value of Z=(x/(2VDt)) using the values given (watch your units). d) Determine the value of the error function ſert(2) 1 05 6.65 0.00 ats 020 0.35 210 ans 00 Talsiasion of Erre Funct Values a) 3 0 0.35 Onda DINO 14 6:45 LOO 15 113 0.70 4715 16 0.95 47112 13 6.3333 O.NO 101 15 02163 03 a. 19 54 AN 60 30 0319 22 to 24 OUT 18 24 es 12 09103 25 नी 4.00 0.333 6941 0913 COM GO 6.99 GONO 0.00 6.900 Table 1 Error Function Values e) Determine the concentration, Cx, at X- X=0.010 in. (0.0254 crn) by solving the equation in a) for the only unknown.
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