2) A pure iron ingot was carburized at 800C. During this carburization process, the diffusion front advanced 0.4mm in 30 minutes. If the temperature is increased by 30C, a distance of 0.6mm is covered in 30 minutes. a) What is the value of D0 and the diffusion coefficient D at 800C ? b) What is the activation energy Q for this diffusion process? (25 points) 2) A pure iron ingot was carburized at 800C. During this carburization process, the diffusion front advanced 0.4mm in 30 minutes. If the temperature is increased by 30C, a distance of 0.6mm is covered in 30 minutes. a) What is the value of D0 and the diffusion coefficient D at 800C ? b) What is the activation energy Q for this diffusion process? (25 points)