Homework 5 - Due 02/24 Carburization with CH4 (methane) to harden a piece: Consider an alloy that initially has a unifor

[answerhappygod]

Homework 5 Due 02 24 Carburization With Ch4 Methane To Harden A Piece Consider An Alloy That Initially Has A Unifor 1 (121.7 KiB) Viewed 41 times

Homework 5 - Due 02/24 Carburization with CH4 (methane) to harden a piece: Consider an alloy that initially has a uniform carbon concentration of 0.25 wt% and it is to be treated at 950 °C (1750 °F). If the concentration of carbon at the surface is suddenly brought to and maintained at 1.2 wt%, how long will it take to achieve a carbon content of 0.8 wt% at a position 0.5 mm from the surface? The diffusion coefficient for carbon in iron at this temperature is 1.6x10-¹¹ m²/s High carbon concentration I I I I I r ī I I I x=0 x=0.5 mm (surface)