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J. (43 points). Consider the gas carburizing of a gear of plain carbon 1020 steel...
J. (43 points). Consider the gas carburizing of a gear of plain carbon 1020 steel at 927°C (1700 ). Assume that the carbon content at the surface is 0.90% and that the steel has a nominal carbon content of 0.2%. The diffusivity (diffusion coefficient) is given as D927°c = 1.28x10-m²/s. 3.1 The error function is a. ert (2010.) = 0.71429 b. er 21 .= 0.63547 c. erfo =0.63547d. None of the above 3.2 The time in hours necessary to increase the carbon content to 0.40% at 0.50 mm below the surface is a. 1 = 3.56 h c. t = 1.77 h b. t = 2.38 h d. None of the above