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PAGE #2 - A thick low carbon steel plate (composition 0.1...

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An ultrasonic inspection technique (nondestructive testing) is available with capability of detecting internal flaws up to 0.04 cm in length. Assume you have a loaded component made out of steel with a fracture toughness of 105 ksi. ..;in. What is the maximum stress that can be applied to a part made from this material without having a crack propagate from a flaw? [Assume that the geometry factor Y = 1.1 ] 2. 3. The diffusivity ofCu in a commercial brass alloy is 10-20 m2/s at 400°C. The activation energy for diffusion of Cu in this system is 195 kJ/mol. Calculate the diffusivity at 500°C.
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Unformatted text preview: A thick low carbon steel plate (composition 0.1 wt% C) is heated to 1000 C in a carbonaceous atmosphere (CH4) to be carburized (hardened by diffusing C). The carburization conditions keep the carbon surface concentration constant at 0.8% C (assume that only one surface of the plate is exposed). How long will it take to achieve a carbon concentration of 0.4 wt% at a 2 mm depth from the surface? [Fe at 1000C is FCC y-Fe.] 4. Do problem 5.27 in the text. 5. 6. Do problem 6.30 in the text. Do problem 7.}9 in the text. 7. 8. Do problem 8.23 in the text. ~ ,.-....
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